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def affine_respective_zoom_matrix(w_range=0.8, h_range=1.1):
"""Get affine transform matrix for zooming/scaling that height and width are changed independently.
OpenCV format, x is width.
Parameters
-----------
w_range : float or tuple of 2 floats
The zooming/scaling ratio of width, greater than 1 means larger.
- float, a fixed ratio.
- tuple of 2 floats, randomly sample a value as the ratio between 2 values.
h_range : float or tuple of 2 floats
The zooming/scaling ratio of height, greater than 1 means larger.
- float, a fixed ratio.
- tuple of 2 floats, randomly sample a value as the ratio between 2 values.
Returns
-------
numpy.array
An affine transform matrix.
"""
if isinstance(h_range, (float, int)):
zy = h_range
elif isinstance(h_range, tuple):
zy = np.random.uniform(h_range[0], h_range[1])
else:
raise Exception("h_range: float or tuple of 2 floats")
if isinstance(w_range, (float, int)):
zx = w_range
elif isinstance(w_range, tuple):
zx = np.random.uniform(w_range[0], w_range[1])
else:
raise Exception("w_range: float or tuple of 2 floats")
zoom_matrix = np.array([[zx, 0, 0], \
[0, zy, 0], \
[0, 0, 1]])
return zoom_matrix |
def transform_matrix_offset_center(matrix, y, x):
"""Convert the matrix from Cartesian coordinates (the origin in the middle of image) to Image coordinates (the origin on the top-left of image).
Parameters
----------
matrix : numpy.array
Transform matrix.
x and y : 2 int
Size of image.
Returns
-------
numpy.array
The transform matrix.
Examples
--------
- See ``tl.prepro.rotation``, ``tl.prepro.shear``, ``tl.prepro.zoom``.
"""
o_x = (x - 1) / 2.0
o_y = (y - 1) / 2.0
offset_matrix = np.array([[1, 0, o_x], [0, 1, o_y], [0, 0, 1]])
reset_matrix = np.array([[1, 0, -o_x], [0, 1, -o_y], [0, 0, 1]])
transform_matrix = np.dot(np.dot(offset_matrix, matrix), reset_matrix)
return transform_matrix |
def affine_transform(x, transform_matrix, channel_index=2, fill_mode='nearest', cval=0., order=1):
"""Return transformed images by given an affine matrix in Scipy format (x is height).
Parameters
----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
transform_matrix : numpy.array
Transform matrix (offset center), can be generated by ``transform_matrix_offset_center``
channel_index : int
Index of channel, default 2.
fill_mode : str
Method to fill missing pixel, default `nearest`, more options `constant`, `reflect` or `wrap`, see `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
cval : float
Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0
order : int
The order of interpolation. The order has to be in the range 0-5:
- 0 Nearest-neighbor
- 1 Bi-linear (default)
- 2 Bi-quadratic
- 3 Bi-cubic
- 4 Bi-quartic
- 5 Bi-quintic
- `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
Returns
-------
numpy.array
A processed image.
Examples
--------
>>> M_shear = tl.prepro.affine_shear_matrix(intensity=0.2, is_random=False)
>>> M_zoom = tl.prepro.affine_zoom_matrix(zoom_range=0.8)
>>> M_combined = M_shear.dot(M_zoom)
>>> transform_matrix = tl.prepro.transform_matrix_offset_center(M_combined, h, w)
>>> result = tl.prepro.affine_transform(image, transform_matrix)
"""
# transform_matrix = transform_matrix_offset_center()
# asdihasid
# asd
x = np.rollaxis(x, channel_index, 0)
final_affine_matrix = transform_matrix[:2, :2]
final_offset = transform_matrix[:2, 2]
channel_images = [
ndi.interpolation.
affine_transform(x_channel, final_affine_matrix, final_offset, order=order, mode=fill_mode, cval=cval)
for x_channel in x
]
x = np.stack(channel_images, axis=0)
x = np.rollaxis(x, 0, channel_index + 1)
return x |
def affine_transform_cv2(x, transform_matrix, flags=None, border_mode='constant'):
"""Return transformed images by given an affine matrix in OpenCV format (x is width). (Powered by OpenCV2, faster than ``tl.prepro.affine_transform``)
Parameters
----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
transform_matrix : numpy.array
A transform matrix, OpenCV format.
border_mode : str
- `constant`, pad the image with a constant value (i.e. black or 0)
- `replicate`, the row or column at the very edge of the original is replicated to the extra border.
Examples
--------
>>> M_shear = tl.prepro.affine_shear_matrix(intensity=0.2, is_random=False)
>>> M_zoom = tl.prepro.affine_zoom_matrix(zoom_range=0.8)
>>> M_combined = M_shear.dot(M_zoom)
>>> result = tl.prepro.affine_transform_cv2(image, M_combined)
"""
rows, cols = x.shape[0], x.shape[1]
if flags is None:
flags = cv2.INTER_AREA
if border_mode is 'constant':
border_mode = cv2.BORDER_CONSTANT
elif border_mode is 'replicate':
border_mode = cv2.BORDER_REPLICATE
else:
raise Exception("unsupport border_mode, check cv.BORDER_ for more details.")
return cv2.warpAffine(x, transform_matrix[0:2,:], \
(cols,rows), flags=flags, borderMode=border_mode) |
def affine_transform_keypoints(coords_list, transform_matrix):
"""Transform keypoint coordinates according to a given affine transform matrix.
OpenCV format, x is width.
Note that, for pose estimation task, flipping requires maintaining the left and right body information.
We should not flip the left and right body, so please use ``tl.prepro.keypoint_random_flip``.
Parameters
-----------
coords_list : list of list of tuple/list
The coordinates
e.g., the keypoint coordinates of every person in an image.
transform_matrix : numpy.array
Transform matrix, OpenCV format.
Examples
---------
>>> # 1. get all affine transform matrices
>>> M_rotate = tl.prepro.affine_rotation_matrix(angle=20)
>>> M_flip = tl.prepro.affine_horizontal_flip_matrix(prob=1)
>>> # 2. combine all affine transform matrices to one matrix
>>> M_combined = dot(M_flip).dot(M_rotate)
>>> # 3. transfrom the matrix from Cartesian coordinate (the origin in the middle of image)
>>> # to Image coordinate (the origin on the top-left of image)
>>> transform_matrix = tl.prepro.transform_matrix_offset_center(M_combined, x=w, y=h)
>>> # 4. then we can transfrom the image once for all transformations
>>> result = tl.prepro.affine_transform_cv2(image, transform_matrix) # 76 times faster
>>> # 5. transform keypoint coordinates
>>> coords = [[(50, 100), (100, 100), (100, 50), (200, 200)], [(250, 50), (200, 50), (200, 100)]]
>>> coords_result = tl.prepro.affine_transform_keypoints(coords, transform_matrix)
"""
coords_result_list = []
for coords in coords_list:
coords = np.asarray(coords)
coords = coords.transpose([1, 0])
coords = np.insert(coords, 2, 1, axis=0)
# print(coords)
# print(transform_matrix)
coords_result = np.matmul(transform_matrix, coords)
coords_result = coords_result[0:2, :].transpose([1, 0])
coords_result_list.append(coords_result)
return coords_result_list |
def projective_transform_by_points(
x, src, dst, map_args=None, output_shape=None, order=1, mode='constant', cval=0.0, clip=True,
preserve_range=False
):
"""Projective transform by given coordinates, usually 4 coordinates.
see `scikit-image <http://scikit-image.org/docs/dev/auto_examples/applications/plot_geometric.html>`__.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
src : list or numpy
The original coordinates, usually 4 coordinates of (width, height).
dst : list or numpy
The coordinates after transformation, the number of coordinates is the same with src.
map_args : dictionary or None
Keyword arguments passed to inverse map.
output_shape : tuple of 2 int
Shape of the output image generated. By default the shape of the input image is preserved. Note that, even for multi-band images, only rows and columns need to be specified.
order : int
The order of interpolation. The order has to be in the range 0-5:
- 0 Nearest-neighbor
- 1 Bi-linear (default)
- 2 Bi-quadratic
- 3 Bi-cubic
- 4 Bi-quartic
- 5 Bi-quintic
mode : str
One of `constant` (default), `edge`, `symmetric`, `reflect` or `wrap`.
Points outside the boundaries of the input are filled according to the given mode. Modes match the behaviour of numpy.pad.
cval : float
Used in conjunction with mode `constant`, the value outside the image boundaries.
clip : boolean
Whether to clip the output to the range of values of the input image. This is enabled by default, since higher order interpolation may produce values outside the given input range.
preserve_range : boolean
Whether to keep the original range of values. Otherwise, the input image is converted according to the conventions of img_as_float.
Returns
-------
numpy.array
A processed image.
Examples
--------
Assume X is an image from CIFAR-10, i.e. shape == (32, 32, 3)
>>> src = [[0,0],[0,32],[32,0],[32,32]] # [w, h]
>>> dst = [[10,10],[0,32],[32,0],[32,32]]
>>> x = tl.prepro.projective_transform_by_points(X, src, dst)
References
-----------
- `scikit-image : geometric transformations <http://scikit-image.org/docs/dev/auto_examples/applications/plot_geometric.html>`__
- `scikit-image : examples <http://scikit-image.org/docs/dev/auto_examples/index.html>`__
"""
if map_args is None:
map_args = {}
# if type(src) is list:
if isinstance(src, list): # convert to numpy
src = np.array(src)
# if type(dst) is list:
if isinstance(dst, list):
dst = np.array(dst)
if np.max(x) > 1: # convert to [0, 1]
x = x / 255
m = transform.ProjectiveTransform()
m.estimate(dst, src)
warped = transform.warp(
x, m, map_args=map_args, output_shape=output_shape, order=order, mode=mode, cval=cval, clip=clip,
preserve_range=preserve_range
)
return warped |
def rotation(
x, rg=20, is_random=False, row_index=0, col_index=1, channel_index=2, fill_mode='nearest', cval=0., order=1
):
"""Rotate an image randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
rg : int or float
Degree to rotate, usually 0 ~ 180.
is_random : boolean
If True, randomly rotate. Default is False
row_index col_index and channel_index : int
Index of row, col and channel, default (0, 1, 2), for theano (1, 2, 0).
fill_mode : str
Method to fill missing pixel, default `nearest`, more options `constant`, `reflect` or `wrap`, see `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
cval : float
Value used for points outside the boundaries of the input if mode=`constant`. Default is 0.0
order : int
The order of interpolation. The order has to be in the range 0-5. See ``tl.prepro.affine_transform`` and `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
Returns
-------
numpy.array
A processed image.
Examples
---------
>>> x --> [row, col, 1]
>>> x = tl.prepro.rotation(x, rg=40, is_random=False)
>>> tl.vis.save_image(x, 'im.png')
"""
if is_random:
theta = np.pi / 180 * np.random.uniform(-rg, rg)
else:
theta = np.pi / 180 * rg
rotation_matrix = np.array([[np.cos(theta), -np.sin(theta), 0], [np.sin(theta), np.cos(theta), 0], [0, 0, 1]])
h, w = x.shape[row_index], x.shape[col_index]
transform_matrix = transform_matrix_offset_center(rotation_matrix, h, w)
x = affine_transform(x, transform_matrix, channel_index, fill_mode, cval, order)
return x |
def crop(x, wrg, hrg, is_random=False, row_index=0, col_index=1):
"""Randomly or centrally crop an image.
Parameters
----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
wrg : int
Size of width.
hrg : int
Size of height.
is_random : boolean,
If True, randomly crop, else central crop. Default is False.
row_index: int
index of row.
col_index: int
index of column.
Returns
-------
numpy.array
A processed image.
"""
h, w = x.shape[row_index], x.shape[col_index]
if (h < hrg) or (w < wrg):
raise AssertionError("The size of cropping should smaller than or equal to the original image")
if is_random:
h_offset = int(np.random.uniform(0, h - hrg))
w_offset = int(np.random.uniform(0, w - wrg))
# tl.logging.info(h_offset, w_offset, x[h_offset: hrg+h_offset ,w_offset: wrg+w_offset].shape)
return x[h_offset:hrg + h_offset, w_offset:wrg + w_offset]
else: # central crop
h_offset = int(np.floor((h - hrg) / 2.))
w_offset = int(np.floor((w - wrg) / 2.))
h_end = h_offset + hrg
w_end = w_offset + wrg
return x[h_offset:h_end, w_offset:w_end] |
def crop_multi(x, wrg, hrg, is_random=False, row_index=0, col_index=1):
"""Randomly or centrally crop multiple images.
Parameters
----------
x : list of numpy.array
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.crop``.
Returns
-------
numpy.array
A list of processed images.
"""
h, w = x[0].shape[row_index], x[0].shape[col_index]
if (h < hrg) or (w < wrg):
raise AssertionError("The size of cropping should smaller than or equal to the original image")
if is_random:
h_offset = int(np.random.uniform(0, h - hrg))
w_offset = int(np.random.uniform(0, w - wrg))
results = []
for data in x:
results.append(data[h_offset:hrg + h_offset, w_offset:wrg + w_offset])
return np.asarray(results)
else:
# central crop
h_offset = (h - hrg) / 2
w_offset = (w - wrg) / 2
results = []
for data in x:
results.append(data[h_offset:h - h_offset, w_offset:w - w_offset])
return np.asarray(results) |
def flip_axis(x, axis=1, is_random=False):
"""Flip the axis of an image, such as flip left and right, up and down, randomly or non-randomly,
Parameters
----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
axis : int
Which axis to flip.
- 0, flip up and down
- 1, flip left and right
- 2, flip channel
is_random : boolean
If True, randomly flip. Default is False.
Returns
-------
numpy.array
A processed image.
"""
if is_random:
factor = np.random.uniform(-1, 1)
if factor > 0:
x = np.asarray(x).swapaxes(axis, 0)
x = x[::-1, ...]
x = x.swapaxes(0, axis)
return x
else:
return x
else:
x = np.asarray(x).swapaxes(axis, 0)
x = x[::-1, ...]
x = x.swapaxes(0, axis)
return x |
def flip_axis_multi(x, axis, is_random=False):
"""Flip the axises of multiple images together, such as flip left and right, up and down, randomly or non-randomly,
Parameters
-----------
x : list of numpy.array
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.flip_axis``.
Returns
-------
numpy.array
A list of processed images.
"""
if is_random:
factor = np.random.uniform(-1, 1)
if factor > 0:
# x = np.asarray(x).swapaxes(axis, 0)
# x = x[::-1, ...]
# x = x.swapaxes(0, axis)
# return x
results = []
for data in x:
data = np.asarray(data).swapaxes(axis, 0)
data = data[::-1, ...]
data = data.swapaxes(0, axis)
results.append(data)
return np.asarray(results)
else:
return np.asarray(x)
else:
# x = np.asarray(x).swapaxes(axis, 0)
# x = x[::-1, ...]
# x = x.swapaxes(0, axis)
# return x
results = []
for data in x:
data = np.asarray(data).swapaxes(axis, 0)
data = data[::-1, ...]
data = data.swapaxes(0, axis)
results.append(data)
return np.asarray(results) |
def shift(
x, wrg=0.1, hrg=0.1, is_random=False, row_index=0, col_index=1, channel_index=2, fill_mode='nearest', cval=0.,
order=1
):
"""Shift an image randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
wrg : float
Percentage of shift in axis x, usually -0.25 ~ 0.25.
hrg : float
Percentage of shift in axis y, usually -0.25 ~ 0.25.
is_random : boolean
If True, randomly shift. Default is False.
row_index col_index and channel_index : int
Index of row, col and channel, default (0, 1, 2), for theano (1, 2, 0).
fill_mode : str
Method to fill missing pixel, default `nearest`, more options `constant`, `reflect` or `wrap`, see `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
cval : float
Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0.
order : int
The order of interpolation. The order has to be in the range 0-5. See ``tl.prepro.affine_transform`` and `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
Returns
-------
numpy.array
A processed image.
"""
h, w = x.shape[row_index], x.shape[col_index]
if is_random:
tx = np.random.uniform(-hrg, hrg) * h
ty = np.random.uniform(-wrg, wrg) * w
else:
tx, ty = hrg * h, wrg * w
translation_matrix = np.array([[1, 0, tx], [0, 1, ty], [0, 0, 1]])
transform_matrix = translation_matrix # no need to do offset
x = affine_transform(x, transform_matrix, channel_index, fill_mode, cval, order)
return x |
def shift_multi(
x, wrg=0.1, hrg=0.1, is_random=False, row_index=0, col_index=1, channel_index=2, fill_mode='nearest', cval=0.,
order=1
):
"""Shift images with the same arguments, randomly or non-randomly.
Usually be used for image segmentation which x=[X, Y], X and Y should be matched.
Parameters
-----------
x : list of numpy.array
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.shift``.
Returns
-------
numpy.array
A list of processed images.
"""
h, w = x[0].shape[row_index], x[0].shape[col_index]
if is_random:
tx = np.random.uniform(-hrg, hrg) * h
ty = np.random.uniform(-wrg, wrg) * w
else:
tx, ty = hrg * h, wrg * w
translation_matrix = np.array([[1, 0, tx], [0, 1, ty], [0, 0, 1]])
transform_matrix = translation_matrix # no need to do offset
results = []
for data in x:
results.append(affine_transform(data, transform_matrix, channel_index, fill_mode, cval, order))
return np.asarray(results) |
def shear(
x, intensity=0.1, is_random=False, row_index=0, col_index=1, channel_index=2, fill_mode='nearest', cval=0.,
order=1
):
"""Shear an image randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
intensity : float
Percentage of shear, usually -0.5 ~ 0.5 (is_random==True), 0 ~ 0.5 (is_random==False),
you can have a quick try by shear(X, 1).
is_random : boolean
If True, randomly shear. Default is False.
row_index col_index and channel_index : int
Index of row, col and channel, default (0, 1, 2), for theano (1, 2, 0).
fill_mode : str
Method to fill missing pixel, default `nearest`, more options `constant`, `reflect` or `wrap`, see and `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
cval : float
Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0.
order : int
The order of interpolation. The order has to be in the range 0-5. See ``tl.prepro.affine_transform`` and `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
Returns
-------
numpy.array
A processed image.
References
-----------
- `Affine transformation <https://uk.mathworks.com/discovery/affine-transformation.html>`__
"""
if is_random:
shear = np.random.uniform(-intensity, intensity)
else:
shear = intensity
shear_matrix = np.array([[1, -np.sin(shear), 0], [0, np.cos(shear), 0], [0, 0, 1]])
h, w = x.shape[row_index], x.shape[col_index]
transform_matrix = transform_matrix_offset_center(shear_matrix, h, w)
x = affine_transform(x, transform_matrix, channel_index, fill_mode, cval, order)
return x |
def shear2(
x, shear=(0.1, 0.1), is_random=False, row_index=0, col_index=1, channel_index=2, fill_mode='nearest', cval=0.,
order=1
):
"""Shear an image randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
shear : tuple of two floats
Percentage of shear for height and width direction (0, 1).
is_random : boolean
If True, randomly shear. Default is False.
row_index col_index and channel_index : int
Index of row, col and channel, default (0, 1, 2), for theano (1, 2, 0).
fill_mode : str
Method to fill missing pixel, default `nearest`, more options `constant`, `reflect` or `wrap`, see `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
cval : float
Value used for points outside the boundaries of the input if mode='constant'. Default is 0.0.
order : int
The order of interpolation. The order has to be in the range 0-5. See ``tl.prepro.affine_transform`` and `scipy ndimage affine_transform <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.interpolation.affine_transform.html>`__
Returns
-------
numpy.array
A processed image.
References
-----------
- `Affine transformation <https://uk.mathworks.com/discovery/affine-transformation.html>`__
"""
if len(shear) != 2:
raise AssertionError(
"shear should be tuple of 2 floats, or you want to use tl.prepro.shear rather than tl.prepro.shear2 ?"
)
if isinstance(shear, tuple):
shear = list(shear)
if is_random:
shear[0] = np.random.uniform(-shear[0], shear[0])
shear[1] = np.random.uniform(-shear[1], shear[1])
shear_matrix = np.array([[1, shear[0], 0], \
[shear[1], 1, 0], \
[0, 0, 1]])
h, w = x.shape[row_index], x.shape[col_index]
transform_matrix = transform_matrix_offset_center(shear_matrix, h, w)
x = affine_transform(x, transform_matrix, channel_index, fill_mode, cval, order)
return x |
def swirl(
x, center=None, strength=1, radius=100, rotation=0, output_shape=None, order=1, mode='constant', cval=0,
clip=True, preserve_range=False, is_random=False
):
"""Swirl an image randomly or non-randomly, see `scikit-image swirl API <http://scikit-image.org/docs/dev/api/skimage.transform.html#skimage.transform.swirl>`__
and `example <http://scikit-image.org/docs/dev/auto_examples/plot_swirl.html>`__.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
center : tuple or 2 int or None
Center coordinate of transformation (optional).
strength : float
The amount of swirling applied.
radius : float
The extent of the swirl in pixels. The effect dies out rapidly beyond radius.
rotation : float
Additional rotation applied to the image, usually [0, 360], relates to center.
output_shape : tuple of 2 int or None
Shape of the output image generated (height, width). By default the shape of the input image is preserved.
order : int, optional
The order of the spline interpolation, default is 1. The order has to be in the range 0-5. See skimage.transform.warp for detail.
mode : str
One of `constant` (default), `edge`, `symmetric` `reflect` and `wrap`.
Points outside the boundaries of the input are filled according to the given mode, with `constant` used as the default. Modes match the behaviour of numpy.pad.
cval : float
Used in conjunction with mode `constant`, the value outside the image boundaries.
clip : boolean
Whether to clip the output to the range of values of the input image. This is enabled by default, since higher order interpolation may produce values outside the given input range.
preserve_range : boolean
Whether to keep the original range of values. Otherwise, the input image is converted according to the conventions of img_as_float.
is_random : boolean,
If True, random swirl. Default is False.
- random center = [(0 ~ x.shape[0]), (0 ~ x.shape[1])]
- random strength = [0, strength]
- random radius = [1e-10, radius]
- random rotation = [-rotation, rotation]
Returns
-------
numpy.array
A processed image.
Examples
---------
>>> x --> [row, col, 1] greyscale
>>> x = tl.prepro.swirl(x, strength=4, radius=100)
"""
if radius == 0:
raise AssertionError("Invalid radius value")
rotation = np.pi / 180 * rotation
if is_random:
center_h = int(np.random.uniform(0, x.shape[0]))
center_w = int(np.random.uniform(0, x.shape[1]))
center = (center_h, center_w)
strength = np.random.uniform(0, strength)
radius = np.random.uniform(1e-10, radius)
rotation = np.random.uniform(-rotation, rotation)
max_v = np.max(x)
if max_v > 1: # Note: the input of this fn should be [-1, 1], rescale is required.
x = x / max_v
swirled = skimage.transform.swirl(
x, center=center, strength=strength, radius=radius, rotation=rotation, output_shape=output_shape, order=order,
mode=mode, cval=cval, clip=clip, preserve_range=preserve_range
)
if max_v > 1:
swirled = swirled * max_v
return swirled |
def elastic_transform(x, alpha, sigma, mode="constant", cval=0, is_random=False):
"""Elastic transformation for image as described in `[Simard2003] <http://deeplearning.cs.cmu.edu/pdfs/Simard.pdf>`__.
Parameters
-----------
x : numpy.array
A greyscale image.
alpha : float
Alpha value for elastic transformation.
sigma : float or sequence of float
The smaller the sigma, the more transformation. Standard deviation for Gaussian kernel. The standard deviations of the Gaussian filter are given for each axis as a sequence, or as a single number, in which case it is equal for all axes.
mode : str
See `scipy.ndimage.filters.gaussian_filter <https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.ndimage.filters.gaussian_filter.html>`__. Default is `constant`.
cval : float,
Used in conjunction with `mode` of `constant`, the value outside the image boundaries.
is_random : boolean
Default is False.
Returns
-------
numpy.array
A processed image.
Examples
---------
>>> x = tl.prepro.elastic_transform(x, alpha=x.shape[1]*3, sigma=x.shape[1]*0.07)
References
------------
- `Github <https://gist.github.com/chsasank/4d8f68caf01f041a6453e67fb30f8f5a>`__.
- `Kaggle <https://www.kaggle.com/pscion/ultrasound-nerve-segmentation/elastic-transform-for-data-augmentation-0878921a>`__
"""
if is_random is False:
random_state = np.random.RandomState(None)
else:
random_state = np.random.RandomState(int(time.time()))
#
is_3d = False
if len(x.shape) == 3 and x.shape[-1] == 1:
x = x[:, :, 0]
is_3d = True
elif len(x.shape) == 3 and x.shape[-1] != 1:
raise Exception("Only support greyscale image")
if len(x.shape) != 2:
raise AssertionError("input should be grey-scale image")
shape = x.shape
dx = gaussian_filter((random_state.rand(*shape) * 2 - 1), sigma, mode=mode, cval=cval) * alpha
dy = gaussian_filter((random_state.rand(*shape) * 2 - 1), sigma, mode=mode, cval=cval) * alpha
x_, y_ = np.meshgrid(np.arange(shape[0]), np.arange(shape[1]), indexing='ij')
indices = np.reshape(x_ + dx, (-1, 1)), np.reshape(y_ + dy, (-1, 1))
if is_3d:
return map_coordinates(x, indices, order=1).reshape((shape[0], shape[1], 1))
else:
return map_coordinates(x, indices, order=1).reshape(shape) |
def zoom(x, zoom_range=(0.9, 1.1), flags=None, border_mode='constant'):
"""Zooming/Scaling a single image that height and width are changed together.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
zoom_range : float or tuple of 2 floats
The zooming/scaling ratio, greater than 1 means larger.
- float, a fixed ratio.
- tuple of 2 floats, randomly sample a value as the ratio between 2 values.
border_mode : str
- `constant`, pad the image with a constant value (i.e. black or 0)
- `replicate`, the row or column at the very edge of the original is replicated to the extra border.
Returns
-------
numpy.array
A processed image.
"""
zoom_matrix = affine_zoom_matrix(zoom_range=zoom_range)
h, w = x.shape[0], x.shape[1]
transform_matrix = transform_matrix_offset_center(zoom_matrix, h, w)
x = affine_transform_cv2(x, transform_matrix, flags=flags, border_mode=border_mode)
return x |
def respective_zoom(x, h_range=(0.9, 1.1), w_range=(0.9, 1.1), flags=None, border_mode='constant'):
"""Zooming/Scaling a single image that height and width are changed independently.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
h_range : float or tuple of 2 floats
The zooming/scaling ratio of height, greater than 1 means larger.
- float, a fixed ratio.
- tuple of 2 floats, randomly sample a value as the ratio between 2 values.
w_range : float or tuple of 2 floats
The zooming/scaling ratio of width, greater than 1 means larger.
- float, a fixed ratio.
- tuple of 2 floats, randomly sample a value as the ratio between 2 values.
border_mode : str
- `constant`, pad the image with a constant value (i.e. black or 0)
- `replicate`, the row or column at the very edge of the original is replicated to the extra border.
Returns
-------
numpy.array
A processed image.
"""
zoom_matrix = affine_respective_zoom_matrix(h_range=h_range, w_range=w_range)
h, w = x.shape[0], x.shape[1]
transform_matrix = transform_matrix_offset_center(zoom_matrix, h, w)
x = affine_transform_cv2(
x, transform_matrix, flags=flags, border_mode=border_mode
) #affine_transform(x, transform_matrix, channel_index, fill_mode, cval, order)
return x |
def zoom_multi(x, zoom_range=(0.9, 1.1), flags=None, border_mode='constant'):
"""Zoom in and out of images with the same arguments, randomly or non-randomly.
Usually be used for image segmentation which x=[X, Y], X and Y should be matched.
Parameters
-----------
x : list of numpy.array
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.zoom``.
Returns
-------
numpy.array
A list of processed images.
"""
zoom_matrix = affine_zoom_matrix(zoom_range=zoom_range)
results = []
for img in x:
h, w = x.shape[0], x.shape[1]
transform_matrix = transform_matrix_offset_center(zoom_matrix, h, w)
results.append(affine_transform_cv2(x, transform_matrix, flags=flags, border_mode=border_mode))
return result |
def brightness(x, gamma=1, gain=1, is_random=False):
"""Change the brightness of a single image, randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
gamma : float
Non negative real number. Default value is 1.
- Small than 1 means brighter.
- If `is_random` is True, gamma in a range of (1-gamma, 1+gamma).
gain : float
The constant multiplier. Default value is 1.
is_random : boolean
If True, randomly change brightness. Default is False.
Returns
-------
numpy.array
A processed image.
References
-----------
- `skimage.exposure.adjust_gamma <http://scikit-image.org/docs/dev/api/skimage.exposure.html>`__
- `chinese blog <http://www.cnblogs.com/denny402/p/5124402.html>`__
"""
if is_random:
gamma = np.random.uniform(1 - gamma, 1 + gamma)
x = exposure.adjust_gamma(x, gamma, gain)
return x |
def brightness_multi(x, gamma=1, gain=1, is_random=False):
"""Change the brightness of multiply images, randomly or non-randomly.
Usually be used for image segmentation which x=[X, Y], X and Y should be matched.
Parameters
-----------
x : list of numpyarray
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.brightness``.
Returns
-------
numpy.array
A list of processed images.
"""
if is_random:
gamma = np.random.uniform(1 - gamma, 1 + gamma)
results = []
for data in x:
results.append(exposure.adjust_gamma(data, gamma, gain))
return np.asarray(results) |
def illumination(x, gamma=1., contrast=1., saturation=1., is_random=False):
"""Perform illumination augmentation for a single image, randomly or non-randomly.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
gamma : float
Change brightness (the same with ``tl.prepro.brightness``)
- if is_random=False, one float number, small than one means brighter, greater than one means darker.
- if is_random=True, tuple of two float numbers, (min, max).
contrast : float
Change contrast.
- if is_random=False, one float number, small than one means blur.
- if is_random=True, tuple of two float numbers, (min, max).
saturation : float
Change saturation.
- if is_random=False, one float number, small than one means unsaturation.
- if is_random=True, tuple of two float numbers, (min, max).
is_random : boolean
If True, randomly change illumination. Default is False.
Returns
-------
numpy.array
A processed image.
Examples
---------
Random
>>> x = tl.prepro.illumination(x, gamma=(0.5, 5.0), contrast=(0.3, 1.0), saturation=(0.7, 1.0), is_random=True)
Non-random
>>> x = tl.prepro.illumination(x, 0.5, 0.6, 0.8, is_random=False)
"""
if is_random:
if not (len(gamma) == len(contrast) == len(saturation) == 2):
raise AssertionError("if is_random = True, the arguments are (min, max)")
## random change brightness # small --> brighter
illum_settings = np.random.randint(0, 3) # 0-brighter, 1-darker, 2 keep normal
if illum_settings == 0: # brighter
gamma = np.random.uniform(gamma[0], 1.0) # (.5, 1.0)
elif illum_settings == 1: # darker
gamma = np.random.uniform(1.0, gamma[1]) # (1.0, 5.0)
else:
gamma = 1
im_ = brightness(x, gamma=gamma, gain=1, is_random=False)
# tl.logging.info("using contrast and saturation")
image = PIL.Image.fromarray(im_) # array -> PIL
contrast_adjust = PIL.ImageEnhance.Contrast(image)
image = contrast_adjust.enhance(np.random.uniform(contrast[0], contrast[1])) #0.3,0.9))
saturation_adjust = PIL.ImageEnhance.Color(image)
image = saturation_adjust.enhance(np.random.uniform(saturation[0], saturation[1])) # (0.7,1.0))
im_ = np.array(image) # PIL -> array
else:
im_ = brightness(x, gamma=gamma, gain=1, is_random=False)
image = PIL.Image.fromarray(im_) # array -> PIL
contrast_adjust = PIL.ImageEnhance.Contrast(image)
image = contrast_adjust.enhance(contrast)
saturation_adjust = PIL.ImageEnhance.Color(image)
image = saturation_adjust.enhance(saturation)
im_ = np.array(image) # PIL -> array
return np.asarray(im_) |
def rgb_to_hsv(rgb):
"""Input RGB image [0~255] return HSV image [0~1].
Parameters
------------
rgb : numpy.array
An image with values between 0 and 255.
Returns
-------
numpy.array
A processed image.
"""
# Translated from source of colorsys.rgb_to_hsv
# r,g,b should be a numpy arrays with values between 0 and 255
# rgb_to_hsv returns an array of floats between 0.0 and 1.0.
rgb = rgb.astype('float')
hsv = np.zeros_like(rgb)
# in case an RGBA array was passed, just copy the A channel
hsv[..., 3:] = rgb[..., 3:]
r, g, b = rgb[..., 0], rgb[..., 1], rgb[..., 2]
maxc = np.max(rgb[..., :3], axis=-1)
minc = np.min(rgb[..., :3], axis=-1)
hsv[..., 2] = maxc
mask = maxc != minc
hsv[mask, 1] = (maxc - minc)[mask] / maxc[mask]
rc = np.zeros_like(r)
gc = np.zeros_like(g)
bc = np.zeros_like(b)
rc[mask] = (maxc - r)[mask] / (maxc - minc)[mask]
gc[mask] = (maxc - g)[mask] / (maxc - minc)[mask]
bc[mask] = (maxc - b)[mask] / (maxc - minc)[mask]
hsv[..., 0] = np.select([r == maxc, g == maxc], [bc - gc, 2.0 + rc - bc], default=4.0 + gc - rc)
hsv[..., 0] = (hsv[..., 0] / 6.0) % 1.0
return hsv |
def hsv_to_rgb(hsv):
"""Input HSV image [0~1] return RGB image [0~255].
Parameters
-------------
hsv : numpy.array
An image with values between 0.0 and 1.0
Returns
-------
numpy.array
A processed image.
"""
# Translated from source of colorsys.hsv_to_rgb
# h,s should be a numpy arrays with values between 0.0 and 1.0
# v should be a numpy array with values between 0.0 and 255.0
# hsv_to_rgb returns an array of uints between 0 and 255.
rgb = np.empty_like(hsv)
rgb[..., 3:] = hsv[..., 3:]
h, s, v = hsv[..., 0], hsv[..., 1], hsv[..., 2]
i = (h * 6.0).astype('uint8')
f = (h * 6.0) - i
p = v * (1.0 - s)
q = v * (1.0 - s * f)
t = v * (1.0 - s * (1.0 - f))
i = i % 6
conditions = [s == 0.0, i == 1, i == 2, i == 3, i == 4, i == 5]
rgb[..., 0] = np.select(conditions, [v, q, p, p, t, v], default=v)
rgb[..., 1] = np.select(conditions, [v, v, v, q, p, p], default=t)
rgb[..., 2] = np.select(conditions, [v, p, t, v, v, q], default=p)
return rgb.astype('uint8') |
def adjust_hue(im, hout=0.66, is_offset=True, is_clip=True, is_random=False):
"""Adjust hue of an RGB image.
This is a convenience method that converts an RGB image to float representation, converts it to HSV, add an offset to the hue channel, converts back to RGB and then back to the original data type.
For TF, see `tf.image.adjust_hue <https://www.tensorflow.org/api_docs/python/tf/image/adjust_hue>`__.and `tf.image.random_hue <https://www.tensorflow.org/api_docs/python/tf/image/random_hue>`__.
Parameters
-----------
im : numpy.array
An image with values between 0 and 255.
hout : float
The scale value for adjusting hue.
- If is_offset is False, set all hue values to this value. 0 is red; 0.33 is green; 0.66 is blue.
- If is_offset is True, add this value as the offset to the hue channel.
is_offset : boolean
Whether `hout` is added on HSV as offset or not. Default is True.
is_clip : boolean
If HSV value smaller than 0, set to 0. Default is True.
is_random : boolean
If True, randomly change hue. Default is False.
Returns
-------
numpy.array
A processed image.
Examples
---------
Random, add a random value between -0.2 and 0.2 as the offset to every hue values.
>>> im_hue = tl.prepro.adjust_hue(image, hout=0.2, is_offset=True, is_random=False)
Non-random, make all hue to green.
>>> im_green = tl.prepro.adjust_hue(image, hout=0.66, is_offset=False, is_random=False)
References
-----------
- `tf.image.random_hue <https://www.tensorflow.org/api_docs/python/tf/image/random_hue>`__.
- `tf.image.adjust_hue <https://www.tensorflow.org/api_docs/python/tf/image/adjust_hue>`__.
- `StackOverflow: Changing image hue with python PIL <https://stackoverflow.com/questions/7274221/changing-image-hue-with-python-pil>`__.
"""
hsv = rgb_to_hsv(im)
if is_random:
hout = np.random.uniform(-hout, hout)
if is_offset:
hsv[..., 0] += hout
else:
hsv[..., 0] = hout
if is_clip:
hsv[..., 0] = np.clip(hsv[..., 0], 0, np.inf) # Hao : can remove green dots
rgb = hsv_to_rgb(hsv)
return rgb |
def imresize(x, size=None, interp='bicubic', mode=None):
"""Resize an image by given output size and method.
Warning, this function will rescale the value to [0, 255].
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
size : list of 2 int or None
For height and width.
interp : str
Interpolation method for re-sizing (`nearest`, `lanczos`, `bilinear`, `bicubic` (default) or `cubic`).
mode : str
The PIL image mode (`P`, `L`, etc.) to convert image before resizing.
Returns
-------
numpy.array
A processed image.
References
------------
- `scipy.misc.imresize <https://docs.scipy.org/doc/scipy/reference/generated/scipy.misc.imresize.html>`__
"""
if size is None:
size = [100, 100]
if x.shape[-1] == 1:
# greyscale
x = scipy.misc.imresize(x[:, :, 0], size, interp=interp, mode=mode)
return x[:, :, np.newaxis]
else:
# rgb, bgr, rgba
return scipy.misc.imresize(x, size, interp=interp, mode=mode) |
def pixel_value_scale(im, val=0.9, clip=None, is_random=False):
"""Scales each value in the pixels of the image.
Parameters
-----------
im : numpy.array
An image.
val : float
The scale value for changing pixel value.
- If is_random=False, multiply this value with all pixels.
- If is_random=True, multiply a value between [1-val, 1+val] with all pixels.
clip : tuple of 2 numbers
The minimum and maximum value.
is_random : boolean
If True, see ``val``.
Returns
-------
numpy.array
A processed image.
Examples
----------
Random
>>> im = pixel_value_scale(im, 0.1, [0, 255], is_random=True)
Non-random
>>> im = pixel_value_scale(im, 0.9, [0, 255], is_random=False)
"""
clip = clip if clip is not None else (-np.inf, np.inf)
if is_random:
scale = 1 + np.random.uniform(-val, val)
im = im * scale
else:
im = im * val
if len(clip) == 2:
im = np.clip(im, clip[0], clip[1])
else:
raise Exception("clip : tuple of 2 numbers")
return im |
def samplewise_norm(
x, rescale=None, samplewise_center=False, samplewise_std_normalization=False, channel_index=2, epsilon=1e-7
):
"""Normalize an image by rescale, samplewise centering and samplewise centering in order.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
rescale : float
Rescaling factor. If None or 0, no rescaling is applied, otherwise we multiply the data by the value provided (before applying any other transformation)
samplewise_center : boolean
If True, set each sample mean to 0.
samplewise_std_normalization : boolean
If True, divide each input by its std.
epsilon : float
A small position value for dividing standard deviation.
Returns
-------
numpy.array
A processed image.
Examples
--------
>>> x = samplewise_norm(x, samplewise_center=True, samplewise_std_normalization=True)
>>> print(x.shape, np.mean(x), np.std(x))
(160, 176, 1), 0.0, 1.0
Notes
------
When samplewise_center and samplewise_std_normalization are True.
- For greyscale image, every pixels are subtracted and divided by the mean and std of whole image.
- For RGB image, every pixels are subtracted and divided by the mean and std of this pixel i.e. the mean and std of a pixel is 0 and 1.
"""
if rescale:
x *= rescale
if x.shape[channel_index] == 1:
# greyscale
if samplewise_center:
x = x - np.mean(x)
if samplewise_std_normalization:
x = x / np.std(x)
return x
elif x.shape[channel_index] == 3:
# rgb
if samplewise_center:
x = x - np.mean(x, axis=channel_index, keepdims=True)
if samplewise_std_normalization:
x = x / (np.std(x, axis=channel_index, keepdims=True) + epsilon)
return x
else:
raise Exception("Unsupported channels %d" % x.shape[channel_index]) |
def featurewise_norm(x, mean=None, std=None, epsilon=1e-7):
"""Normalize every pixels by the same given mean and std, which are usually
compute from all examples.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
mean : float
Value for subtraction.
std : float
Value for division.
epsilon : float
A small position value for dividing standard deviation.
Returns
-------
numpy.array
A processed image.
"""
if mean:
x = x - mean
if std:
x = x / (std + epsilon)
return x |
def get_zca_whitening_principal_components_img(X):
"""Return the ZCA whitening principal components matrix.
Parameters
-----------
x : numpy.array
Batch of images with dimension of [n_example, row, col, channel] (default).
Returns
-------
numpy.array
A processed image.
"""
flatX = np.reshape(X, (X.shape[0], X.shape[1] * X.shape[2] * X.shape[3]))
tl.logging.info("zca : computing sigma ..")
sigma = np.dot(flatX.T, flatX) / flatX.shape[0]
tl.logging.info("zca : computing U, S and V ..")
U, S, _ = linalg.svd(sigma) # USV
tl.logging.info("zca : computing principal components ..")
principal_components = np.dot(np.dot(U, np.diag(1. / np.sqrt(S + 10e-7))), U.T)
return principal_components |
def zca_whitening(x, principal_components):
"""Apply ZCA whitening on an image by given principal components matrix.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
principal_components : matrix
Matrix from ``get_zca_whitening_principal_components_img``.
Returns
-------
numpy.array
A processed image.
"""
flatx = np.reshape(x, (x.size))
# tl.logging.info(principal_components.shape, x.shape) # ((28160, 28160), (160, 176, 1))
# flatx = np.reshape(x, (x.shape))
# flatx = np.reshape(x, (x.shape[0], ))
# tl.logging.info(flatx.shape) # (160, 176, 1)
whitex = np.dot(flatx, principal_components)
x = np.reshape(whitex, (x.shape[0], x.shape[1], x.shape[2]))
return x |
def channel_shift(x, intensity, is_random=False, channel_index=2):
"""Shift the channels of an image, randomly or non-randomly, see `numpy.rollaxis <https://docs.scipy.org/doc/numpy/reference/generated/numpy.rollaxis.html>`__.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] (default).
intensity : float
Intensity of shifting.
is_random : boolean
If True, randomly shift. Default is False.
channel_index : int
Index of channel. Default is 2.
Returns
-------
numpy.array
A processed image.
"""
if is_random:
factor = np.random.uniform(-intensity, intensity)
else:
factor = intensity
x = np.rollaxis(x, channel_index, 0)
min_x, max_x = np.min(x), np.max(x)
channel_images = [np.clip(x_channel + factor, min_x, max_x) for x_channel in x]
x = np.stack(channel_images, axis=0)
x = np.rollaxis(x, 0, channel_index + 1)
return x |
def channel_shift_multi(x, intensity, is_random=False, channel_index=2):
"""Shift the channels of images with the same arguments, randomly or non-randomly, see `numpy.rollaxis <https://docs.scipy.org/doc/numpy/reference/generated/numpy.rollaxis.html>`__.
Usually be used for image segmentation which x=[X, Y], X and Y should be matched.
Parameters
-----------
x : list of numpy.array
List of images with dimension of [n_images, row, col, channel] (default).
others : args
See ``tl.prepro.channel_shift``.
Returns
-------
numpy.array
A list of processed images.
"""
if is_random:
factor = np.random.uniform(-intensity, intensity)
else:
factor = intensity
results = []
for data in x:
data = np.rollaxis(data, channel_index, 0)
min_x, max_x = np.min(data), np.max(data)
channel_images = [np.clip(x_channel + factor, min_x, max_x) for x_channel in x]
data = np.stack(channel_images, axis=0)
data = np.rollaxis(x, 0, channel_index + 1)
results.append(data)
return np.asarray(results) |
def drop(x, keep=0.5):
"""Randomly set some pixels to zero by a given keeping probability.
Parameters
-----------
x : numpy.array
An image with dimension of [row, col, channel] or [row, col].
keep : float
The keeping probability (0, 1), the lower more values will be set to zero.
Returns
-------
numpy.array
A processed image.
"""
if len(x.shape) == 3:
if x.shape[-1] == 3: # color
img_size = x.shape
mask = np.random.binomial(n=1, p=keep, size=x.shape[:-1])
for i in range(3):
x[:, :, i] = np.multiply(x[:, :, i], mask)
elif x.shape[-1] == 1: # greyscale image
img_size = x.shape
x = np.multiply(x, np.random.binomial(n=1, p=keep, size=img_size))
else:
raise Exception("Unsupported shape {}".format(x.shape))
elif len(x.shape) == 2 or 1: # greyscale matrix (image) or vector
img_size = x.shape
x = np.multiply(x, np.random.binomial(n=1, p=keep, size=img_size))
else:
raise Exception("Unsupported shape {}".format(x.shape))
return x |
def array_to_img(x, dim_ordering=(0, 1, 2), scale=True):
"""Converts a numpy array to PIL image object (uint8 format).
Parameters
----------
x : numpy.array
An image with dimension of 3 and channels of 1 or 3.
dim_ordering : tuple of 3 int
Index of row, col and channel, default (0, 1, 2), for theano (1, 2, 0).
scale : boolean
If True, converts image to [0, 255] from any range of value like [-1, 2]. Default is True.
Returns
-------
PIL.image
An image.
References
-----------
`PIL Image.fromarray <http://pillow.readthedocs.io/en/3.1.x/reference/Image.html?highlight=fromarray>`__
"""
# if dim_ordering == 'default':
# dim_ordering = K.image_dim_ordering()
# if dim_ordering == 'th': # theano
# x = x.transpose(1, 2, 0)
x = x.transpose(dim_ordering)
if scale:
x += max(-np.min(x), 0)
x_max = np.max(x)
if x_max != 0:
# tl.logging.info(x_max)
# x /= x_max
x = x / x_max
x *= 255
if x.shape[2] == 3:
# RGB
return PIL.Image.fromarray(x.astype('uint8'), 'RGB')
elif x.shape[2] == 1:
# grayscale
return PIL.Image.fromarray(x[:, :, 0].astype('uint8'), 'L')
else:
raise Exception('Unsupported channel number: ', x.shape[2]) |
def find_contours(x, level=0.8, fully_connected='low', positive_orientation='low'):
"""Find iso-valued contours in a 2D array for a given level value, returns list of (n, 2)-ndarrays
see `skimage.measure.find_contours <http://scikit-image.org/docs/dev/api/skimage.measure.html#skimage.measure.find_contours>`__.
Parameters
------------
x : 2D ndarray of double.
Input data in which to find contours.
level : float
Value along which to find contours in the array.
fully_connected : str
Either `low` or `high`. Indicates whether array elements below the given level value are to be considered fully-connected (and hence elements above the value will only be face connected), or vice-versa. (See notes below for details.)
positive_orientation : str
Either `low` or `high`. Indicates whether the output contours will produce positively-oriented polygons around islands of low- or high-valued elements. If `low` then contours will wind counter-clockwise around elements below the iso-value. Alternately, this means that low-valued elements are always on the left of the contour.
Returns
--------
list of (n,2)-ndarrays
Each contour is an ndarray of shape (n, 2), consisting of n (row, column) coordinates along the contour.
"""
return skimage.measure.find_contours(
x, level, fully_connected=fully_connected, positive_orientation=positive_orientation
) |
def pt2map(list_points=None, size=(100, 100), val=1):
"""Inputs a list of points, return a 2D image.
Parameters
--------------
list_points : list of 2 int
[[x, y], [x, y]..] for point coordinates.
size : tuple of 2 int
(w, h) for output size.
val : float or int
For the contour value.
Returns
-------
numpy.array
An image.
"""
if list_points is None:
raise Exception("list_points : list of 2 int")
i_m = np.zeros(size)
if len(list_points) == 0:
return i_m
for xx in list_points:
for x in xx:
# tl.logging.info(x)
i_m[int(np.round(x[0]))][int(np.round(x[1]))] = val
return i_m |
def binary_dilation(x, radius=3):
"""Return fast binary morphological dilation of an image.
see `skimage.morphology.binary_dilation <http://scikit-image.org/docs/dev/api/skimage.morphology.html#skimage.morphology.binary_dilation>`__.
Parameters
-----------
x : 2D array
A binary image.
radius : int
For the radius of mask.
Returns
-------
numpy.array
A processed binary image.
"""
mask = disk(radius)
x = _binary_dilation(x, selem=mask)
return x |
def dilation(x, radius=3):
"""Return greyscale morphological dilation of an image,
see `skimage.morphology.dilation <http://scikit-image.org/docs/dev/api/skimage.morphology.html#skimage.morphology.dilation>`__.
Parameters
-----------
x : 2D array
An greyscale image.
radius : int
For the radius of mask.
Returns
-------
numpy.array
A processed greyscale image.
"""
mask = disk(radius)
x = dilation(x, selem=mask)
return x |
def binary_erosion(x, radius=3):
"""Return binary morphological erosion of an image,
see `skimage.morphology.binary_erosion <http://scikit-image.org/docs/dev/api/skimage.morphology.html#skimage.morphology.binary_erosion>`__.
Parameters
-----------
x : 2D array
A binary image.
radius : int
For the radius of mask.
Returns
-------
numpy.array
A processed binary image.
"""
mask = disk(radius)
x = _binary_erosion(x, selem=mask)
return x |
def erosion(x, radius=3):
"""Return greyscale morphological erosion of an image,
see `skimage.morphology.erosion <http://scikit-image.org/docs/dev/api/skimage.morphology.html#skimage.morphology.erosion>`__.
Parameters
-----------
x : 2D array
A greyscale image.
radius : int
For the radius of mask.
Returns
-------
numpy.array
A processed greyscale image.
"""
mask = disk(radius)
x = _erosion(x, selem=mask)
return x |
def obj_box_coords_rescale(coords=None, shape=None):
"""Scale down a list of coordinates from pixel unit to the ratio of image size i.e. in the range of [0, 1].
Parameters
------------
coords : list of list of 4 ints or None
For coordinates of more than one images .e.g.[[x, y, w, h], [x, y, w, h], ...].
shape : list of 2 int or None
【height, width].
Returns
-------
list of list of 4 numbers
A list of new bounding boxes.
Examples
---------
>>> coords = obj_box_coords_rescale(coords=[[30, 40, 50, 50], [10, 10, 20, 20]], shape=[100, 100])
>>> print(coords)
[[0.3, 0.4, 0.5, 0.5], [0.1, 0.1, 0.2, 0.2]]
>>> coords = obj_box_coords_rescale(coords=[[30, 40, 50, 50]], shape=[50, 100])
>>> print(coords)
[[0.3, 0.8, 0.5, 1.0]]
>>> coords = obj_box_coords_rescale(coords=[[30, 40, 50, 50]], shape=[100, 200])
>>> print(coords)
[[0.15, 0.4, 0.25, 0.5]]
Returns
-------
list of 4 numbers
New coordinates.
"""
if coords is None:
coords = []
if shape is None:
shape = [100, 200]
imh, imw = shape[0], shape[1]
imh = imh * 1.0 # * 1.0 for python2 : force division to be float point
imw = imw * 1.0
coords_new = list()
for coord in coords:
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
x = coord[0] / imw
y = coord[1] / imh
w = coord[2] / imw
h = coord[3] / imh
coords_new.append([x, y, w, h])
return coords_new |
def obj_box_coord_rescale(coord=None, shape=None):
"""Scale down one coordinates from pixel unit to the ratio of image size i.e. in the range of [0, 1].
It is the reverse process of ``obj_box_coord_scale_to_pixelunit``.
Parameters
------------
coords : list of 4 int or None
One coordinates of one image e.g. [x, y, w, h].
shape : list of 2 int or None
For [height, width].
Returns
-------
list of 4 numbers
New bounding box.
Examples
---------
>>> coord = tl.prepro.obj_box_coord_rescale(coord=[30, 40, 50, 50], shape=[100, 100])
[0.3, 0.4, 0.5, 0.5]
"""
if coord is None:
coord = []
if shape is None:
shape = [100, 200]
return obj_box_coords_rescale(coords=[coord], shape=shape)[0] |
def obj_box_coord_scale_to_pixelunit(coord, shape=None):
"""Convert one coordinate [x, y, w (or x2), h (or y2)] in ratio format to image coordinate format.
It is the reverse process of ``obj_box_coord_rescale``.
Parameters
-----------
coord : list of 4 float
One coordinate of one image [x, y, w (or x2), h (or y2)] in ratio format, i.e value range [0~1].
shape : tuple of 2 or None
For [height, width].
Returns
-------
list of 4 numbers
New bounding box.
Examples
---------
>>> x, y, x2, y2 = tl.prepro.obj_box_coord_scale_to_pixelunit([0.2, 0.3, 0.5, 0.7], shape=(100, 200, 3))
[40, 30, 100, 70]
"""
if shape is None:
shape = [100, 100]
imh, imw = shape[0:2]
x = int(coord[0] * imw)
x2 = int(coord[2] * imw)
y = int(coord[1] * imh)
y2 = int(coord[3] * imh)
return [x, y, x2, y2] |
def obj_box_coord_centroid_to_upleft_butright(coord, to_int=False):
"""Convert one coordinate [x_center, y_center, w, h] to [x1, y1, x2, y2] in up-left and botton-right format.
Parameters
------------
coord : list of 4 int/float
One coordinate.
to_int : boolean
Whether to convert output as integer.
Returns
-------
list of 4 numbers
New bounding box.
Examples
---------
>>> coord = obj_box_coord_centroid_to_upleft_butright([30, 40, 20, 20])
[20, 30, 40, 50]
"""
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
x_center, y_center, w, h = coord
x = x_center - w / 2.
y = y_center - h / 2.
x2 = x + w
y2 = y + h
if to_int:
return [int(x), int(y), int(x2), int(y2)]
else:
return [x, y, x2, y2] |
def obj_box_coord_upleft_butright_to_centroid(coord):
"""Convert one coordinate [x1, y1, x2, y2] to [x_center, y_center, w, h].
It is the reverse process of ``obj_box_coord_centroid_to_upleft_butright``.
Parameters
------------
coord : list of 4 int/float
One coordinate.
Returns
-------
list of 4 numbers
New bounding box.
"""
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x1, y1, x2, y2]")
x1, y1, x2, y2 = coord
w = x2 - x1
h = y2 - y1
x_c = x1 + w / 2.
y_c = y1 + h / 2.
return [x_c, y_c, w, h] |
def obj_box_coord_centroid_to_upleft(coord):
"""Convert one coordinate [x_center, y_center, w, h] to [x, y, w, h].
It is the reverse process of ``obj_box_coord_upleft_to_centroid``.
Parameters
------------
coord : list of 4 int/float
One coordinate.
Returns
-------
list of 4 numbers
New bounding box.
"""
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
x_center, y_center, w, h = coord
x = x_center - w / 2.
y = y_center - h / 2.
return [x, y, w, h] |
def parse_darknet_ann_str_to_list(annotations):
r"""Input string format of class, x, y, w, h, return list of list format.
Parameters
-----------
annotations : str
The annotations in darkent format "class, x, y, w, h ...." seperated by "\\n".
Returns
-------
list of list of 4 numbers
List of bounding box.
"""
annotations = annotations.split("\n")
ann = []
for a in annotations:
a = a.split()
if len(a) == 5:
for i, _v in enumerate(a):
if i == 0:
a[i] = int(a[i])
else:
a[i] = float(a[i])
ann.append(a)
return ann |
def parse_darknet_ann_list_to_cls_box(annotations):
"""Parse darknet annotation format into two lists for class and bounding box.
Input list of [[class, x, y, w, h], ...], return two list of [class ...] and [[x, y, w, h], ...].
Parameters
------------
annotations : list of list
A list of class and bounding boxes of images e.g. [[class, x, y, w, h], ...]
Returns
-------
list of int
List of class labels.
list of list of 4 numbers
List of bounding box.
"""
class_list = []
bbox_list = []
for ann in annotations:
class_list.append(ann[0])
bbox_list.append(ann[1:])
return class_list, bbox_list |
def obj_box_horizontal_flip(im, coords=None, is_rescale=False, is_center=False, is_random=False):
"""Left-right flip the image and coordinates for object detection.
Parameters
----------
im : numpy.array
An image with dimension of [row, col, channel] (default).
coords : list of list of 4 int/float or None
Coordinates [[x, y, w, h], [x, y, w, h], ...].
is_rescale : boolean
Set to True, if the input coordinates are rescaled to [0, 1]. Default is False.
is_center : boolean
Set to True, if the x and y of coordinates are the centroid (i.e. darknet format). Default is False.
is_random : boolean
If True, randomly flip. Default is False.
Returns
-------
numpy.array
A processed image
list of list of 4 numbers
A list of new bounding boxes.
Examples
--------
>>> im = np.zeros([80, 100]) # as an image with shape width=100, height=80
>>> im, coords = obj_box_left_right_flip(im, coords=[[0.2, 0.4, 0.3, 0.3], [0.1, 0.5, 0.2, 0.3]], is_rescale=True, is_center=True, is_random=False)
>>> print(coords)
[[0.8, 0.4, 0.3, 0.3], [0.9, 0.5, 0.2, 0.3]]
>>> im, coords = obj_box_left_right_flip(im, coords=[[0.2, 0.4, 0.3, 0.3]], is_rescale=True, is_center=False, is_random=False)
>>> print(coords)
[[0.5, 0.4, 0.3, 0.3]]
>>> im, coords = obj_box_left_right_flip(im, coords=[[20, 40, 30, 30]], is_rescale=False, is_center=True, is_random=False)
>>> print(coords)
[[80, 40, 30, 30]]
>>> im, coords = obj_box_left_right_flip(im, coords=[[20, 40, 30, 30]], is_rescale=False, is_center=False, is_random=False)
>>> print(coords)
[[50, 40, 30, 30]]
"""
if coords is None:
coords = []
def _flip(im, coords):
im = flip_axis(im, axis=1, is_random=False)
coords_new = list()
for coord in coords:
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
if is_rescale:
if is_center:
# x_center' = 1 - x
x = 1. - coord[0]
else:
# x_center' = 1 - x - w
x = 1. - coord[0] - coord[2]
else:
if is_center:
# x' = im.width - x
x = im.shape[1] - coord[0]
else:
# x' = im.width - x - w
x = im.shape[1] - coord[0] - coord[2]
coords_new.append([x, coord[1], coord[2], coord[3]])
return im, coords_new
if is_random:
factor = np.random.uniform(-1, 1)
if factor > 0:
return _flip(im, coords)
else:
return im, coords
else:
return _flip(im, coords) |
def obj_box_imresize(im, coords=None, size=None, interp='bicubic', mode=None, is_rescale=False):
"""Resize an image, and compute the new bounding box coordinates.
Parameters
-------------
im : numpy.array
An image with dimension of [row, col, channel] (default).
coords : list of list of 4 int/float or None
Coordinates [[x, y, w, h], [x, y, w, h], ...]
size interp and mode : args
See ``tl.prepro.imresize``.
is_rescale : boolean
Set to True, if the input coordinates are rescaled to [0, 1], then return the original coordinates. Default is False.
Returns
-------
numpy.array
A processed image
list of list of 4 numbers
A list of new bounding boxes.
Examples
--------
>>> im = np.zeros([80, 100, 3]) # as an image with shape width=100, height=80
>>> _, coords = obj_box_imresize(im, coords=[[20, 40, 30, 30], [10, 20, 20, 20]], size=[160, 200], is_rescale=False)
>>> print(coords)
[[40, 80, 60, 60], [20, 40, 40, 40]]
>>> _, coords = obj_box_imresize(im, coords=[[20, 40, 30, 30]], size=[40, 100], is_rescale=False)
>>> print(coords)
[[20, 20, 30, 15]]
>>> _, coords = obj_box_imresize(im, coords=[[20, 40, 30, 30]], size=[60, 150], is_rescale=False)
>>> print(coords)
[[30, 30, 45, 22]]
>>> im2, coords = obj_box_imresize(im, coords=[[0.2, 0.4, 0.3, 0.3]], size=[160, 200], is_rescale=True)
>>> print(coords, im2.shape)
[[0.2, 0.4, 0.3, 0.3]] (160, 200, 3)
"""
if coords is None:
coords = []
if size is None:
size = [100, 100]
imh, imw = im.shape[0:2]
imh = imh * 1.0 # * 1.0 for python2 : force division to be float point
imw = imw * 1.0
im = imresize(im, size=size, interp=interp, mode=mode)
if is_rescale is False:
coords_new = list()
for coord in coords:
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
# x' = x * (imw'/imw)
x = int(coord[0] * (size[1] / imw))
# y' = y * (imh'/imh)
# tl.logging.info('>>', coord[1], size[0], imh)
y = int(coord[1] * (size[0] / imh))
# w' = w * (imw'/imw)
w = int(coord[2] * (size[1] / imw))
# h' = h * (imh'/imh)
h = int(coord[3] * (size[0] / imh))
coords_new.append([x, y, w, h])
return im, coords_new
else:
return im, coords |
def obj_box_crop(
im, classes=None, coords=None, wrg=100, hrg=100, is_rescale=False, is_center=False, is_random=False,
thresh_wh=0.02, thresh_wh2=12.
):
"""Randomly or centrally crop an image, and compute the new bounding box coordinates.
Objects outside the cropped image will be removed.
Parameters
-----------
im : numpy.array
An image with dimension of [row, col, channel] (default).
classes : list of int or None
Class IDs.
coords : list of list of 4 int/float or None
Coordinates [[x, y, w, h], [x, y, w, h], ...]
wrg hrg and is_random : args
See ``tl.prepro.crop``.
is_rescale : boolean
Set to True, if the input coordinates are rescaled to [0, 1]. Default is False.
is_center : boolean, default False
Set to True, if the x and y of coordinates are the centroid (i.e. darknet format). Default is False.
thresh_wh : float
Threshold, remove the box if its ratio of width(height) to image size less than the threshold.
thresh_wh2 : float
Threshold, remove the box if its ratio of width to height or vice verse higher than the threshold.
Returns
-------
numpy.array
A processed image
list of int
A list of classes
list of list of 4 numbers
A list of new bounding boxes.
"""
if classes is None:
classes = []
if coords is None:
coords = []
h, w = im.shape[0], im.shape[1]
if (h <= hrg) or (w <= wrg):
raise AssertionError("The size of cropping should smaller than the original image")
if is_random:
h_offset = int(np.random.uniform(0, h - hrg) - 1)
w_offset = int(np.random.uniform(0, w - wrg) - 1)
h_end = hrg + h_offset
w_end = wrg + w_offset
im_new = im[h_offset:h_end, w_offset:w_end]
else: # central crop
h_offset = int(np.floor((h - hrg) / 2.))
w_offset = int(np.floor((w - wrg) / 2.))
h_end = h_offset + hrg
w_end = w_offset + wrg
im_new = im[h_offset:h_end, w_offset:w_end]
# w
# _____________________________
# | h/w offset |
# | ------- |
# h | | | |
# | | | |
# | ------- |
# | h/w end |
# |___________________________|
def _get_coord(coord):
"""Input pixel-unit [x, y, w, h] format, then make sure [x, y] it is the up-left coordinates,
before getting the new coordinates.
Boxes outsides the cropped image will be removed.
"""
if is_center:
coord = obj_box_coord_centroid_to_upleft(coord)
##======= pixel unit format and upleft, w, h ==========##
# x = np.clip( coord[0] - w_offset, 0, w_end - w_offset)
# y = np.clip( coord[1] - h_offset, 0, h_end - h_offset)
# w = np.clip( coord[2] , 0, w_end - w_offset)
# h = np.clip( coord[3] , 0, h_end - h_offset)
x = coord[0] - w_offset
y = coord[1] - h_offset
w = coord[2]
h = coord[3]
if x < 0:
if x + w <= 0:
return None
w = w + x
x = 0
elif x > im_new.shape[1]: # object outside the cropped image
return None
if y < 0:
if y + h <= 0:
return None
h = h + y
y = 0
elif y > im_new.shape[0]: # object outside the cropped image
return None
if (x is not None) and (x + w > im_new.shape[1]): # box outside the cropped image
w = im_new.shape[1] - x
if (y is not None) and (y + h > im_new.shape[0]): # box outside the cropped image
h = im_new.shape[0] - y
if (w / (h + 1.) > thresh_wh2) or (h / (w + 1.) > thresh_wh2): # object shape strange: too narrow
# tl.logging.info('xx', w, h)
return None
if (w / (im_new.shape[1] * 1.) < thresh_wh) or (h / (im_new.shape[0] * 1.) <
thresh_wh): # object shape strange: too narrow
# tl.logging.info('yy', w, im_new.shape[1], h, im_new.shape[0])
return None
coord = [x, y, w, h]
## convert back if input format is center.
if is_center:
coord = obj_box_coord_upleft_to_centroid(coord)
return coord
coords_new = list()
classes_new = list()
for i, _ in enumerate(coords):
coord = coords[i]
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
if is_rescale:
# for scaled coord, upscaled before process and scale back in the end.
coord = obj_box_coord_scale_to_pixelunit(coord, im.shape)
coord = _get_coord(coord)
if coord is not None:
coord = obj_box_coord_rescale(coord, im_new.shape)
coords_new.append(coord)
classes_new.append(classes[i])
else:
coord = _get_coord(coord)
if coord is not None:
coords_new.append(coord)
classes_new.append(classes[i])
return im_new, classes_new, coords_new |
def obj_box_shift(
im, classes=None, coords=None, wrg=0.1, hrg=0.1, row_index=0, col_index=1, channel_index=2, fill_mode='nearest',
cval=0., order=1, is_rescale=False, is_center=False, is_random=False, thresh_wh=0.02, thresh_wh2=12.
):
"""Shift an image randomly or non-randomly, and compute the new bounding box coordinates.
Objects outside the cropped image will be removed.
Parameters
-----------
im : numpy.array
An image with dimension of [row, col, channel] (default).
classes : list of int or None
Class IDs.
coords : list of list of 4 int/float or None
Coordinates [[x, y, w, h], [x, y, w, h], ...]
wrg, hrg row_index col_index channel_index is_random fill_mode cval and order : see ``tl.prepro.shift``.
is_rescale : boolean
Set to True, if the input coordinates are rescaled to [0, 1]. Default is False.
is_center : boolean
Set to True, if the x and y of coordinates are the centroid (i.e. darknet format). Default is False.
thresh_wh : float
Threshold, remove the box if its ratio of width(height) to image size less than the threshold.
thresh_wh2 : float
Threshold, remove the box if its ratio of width to height or vice verse higher than the threshold.
Returns
-------
numpy.array
A processed image
list of int
A list of classes
list of list of 4 numbers
A list of new bounding boxes.
"""
if classes is None:
classes = []
if coords is None:
coords = []
imh, imw = im.shape[row_index], im.shape[col_index]
if (hrg >= 1.0) and (hrg <= 0.) and (wrg >= 1.0) and (wrg <= 0.):
raise AssertionError("shift range should be (0, 1)")
if is_random:
tx = np.random.uniform(-hrg, hrg) * imh
ty = np.random.uniform(-wrg, wrg) * imw
else:
tx, ty = hrg * imh, wrg * imw
translation_matrix = np.array([[1, 0, tx], [0, 1, ty], [0, 0, 1]])
transform_matrix = translation_matrix # no need to do offset
im_new = affine_transform(im, transform_matrix, channel_index, fill_mode, cval, order)
# modified from obj_box_crop
def _get_coord(coord):
"""Input pixel-unit [x, y, w, h] format, then make sure [x, y] it is the up-left coordinates,
before getting the new coordinates.
Boxes outsides the cropped image will be removed.
"""
if is_center:
coord = obj_box_coord_centroid_to_upleft(coord)
##======= pixel unit format and upleft, w, h ==========##
x = coord[0] - ty # only change this
y = coord[1] - tx # only change this
w = coord[2]
h = coord[3]
if x < 0:
if x + w <= 0:
return None
w = w + x
x = 0
elif x > im_new.shape[1]: # object outside the cropped image
return None
if y < 0:
if y + h <= 0:
return None
h = h + y
y = 0
elif y > im_new.shape[0]: # object outside the cropped image
return None
if (x is not None) and (x + w > im_new.shape[1]): # box outside the cropped image
w = im_new.shape[1] - x
if (y is not None) and (y + h > im_new.shape[0]): # box outside the cropped image
h = im_new.shape[0] - y
if (w / (h + 1.) > thresh_wh2) or (h / (w + 1.) > thresh_wh2): # object shape strange: too narrow
# tl.logging.info('xx', w, h)
return None
if (w / (im_new.shape[1] * 1.) < thresh_wh) or (h / (im_new.shape[0] * 1.) <
thresh_wh): # object shape strange: too narrow
# tl.logging.info('yy', w, im_new.shape[1], h, im_new.shape[0])
return None
coord = [x, y, w, h]
## convert back if input format is center.
if is_center:
coord = obj_box_coord_upleft_to_centroid(coord)
return coord
coords_new = list()
classes_new = list()
for i, _ in enumerate(coords):
coord = coords[i]
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
if is_rescale:
# for scaled coord, upscaled before process and scale back in the end.
coord = obj_box_coord_scale_to_pixelunit(coord, im.shape)
coord = _get_coord(coord)
if coord is not None:
coord = obj_box_coord_rescale(coord, im_new.shape)
coords_new.append(coord)
classes_new.append(classes[i])
else:
coord = _get_coord(coord)
if coord is not None:
coords_new.append(coord)
classes_new.append(classes[i])
return im_new, classes_new, coords_new |
def obj_box_zoom(
im, classes=None, coords=None, zoom_range=(0.9,
1.1), row_index=0, col_index=1, channel_index=2, fill_mode='nearest',
cval=0., order=1, is_rescale=False, is_center=False, is_random=False, thresh_wh=0.02, thresh_wh2=12.
):
"""Zoom in and out of a single image, randomly or non-randomly, and compute the new bounding box coordinates.
Objects outside the cropped image will be removed.
Parameters
-----------
im : numpy.array
An image with dimension of [row, col, channel] (default).
classes : list of int or None
Class IDs.
coords : list of list of 4 int/float or None
Coordinates [[x, y, w, h], [x, y, w, h], ...].
zoom_range row_index col_index channel_index is_random fill_mode cval and order : see ``tl.prepro.zoom``.
is_rescale : boolean
Set to True, if the input coordinates are rescaled to [0, 1]. Default is False.
is_center : boolean
Set to True, if the x and y of coordinates are the centroid. (i.e. darknet format). Default is False.
thresh_wh : float
Threshold, remove the box if its ratio of width(height) to image size less than the threshold.
thresh_wh2 : float
Threshold, remove the box if its ratio of width to height or vice verse higher than the threshold.
Returns
-------
numpy.array
A processed image
list of int
A list of classes
list of list of 4 numbers
A list of new bounding boxes.
"""
if classes is None:
classes = []
if coords is None:
coords = []
if len(zoom_range) != 2:
raise Exception('zoom_range should be a tuple or list of two floats. ' 'Received arg: ', zoom_range)
if is_random:
if zoom_range[0] == 1 and zoom_range[1] == 1:
zx, zy = 1, 1
tl.logging.info(" random_zoom : not zoom in/out")
else:
zx, zy = np.random.uniform(zoom_range[0], zoom_range[1], 2)
else:
zx, zy = zoom_range
# tl.logging.info(zx, zy)
zoom_matrix = np.array([[zx, 0, 0], [0, zy, 0], [0, 0, 1]])
h, w = im.shape[row_index], im.shape[col_index]
transform_matrix = transform_matrix_offset_center(zoom_matrix, h, w)
im_new = affine_transform(im, transform_matrix, channel_index, fill_mode, cval, order)
# modified from obj_box_crop
def _get_coord(coord):
"""Input pixel-unit [x, y, w, h] format, then make sure [x, y] it is the up-left coordinates,
before getting the new coordinates.
Boxes outsides the cropped image will be removed.
"""
if is_center:
coord = obj_box_coord_centroid_to_upleft(coord)
# ======= pixel unit format and upleft, w, h ==========
x = (coord[0] - im.shape[1] / 2) / zy + im.shape[1] / 2 # only change this
y = (coord[1] - im.shape[0] / 2) / zx + im.shape[0] / 2 # only change this
w = coord[2] / zy # only change this
h = coord[3] / zx # only change thisS
if x < 0:
if x + w <= 0:
return None
w = w + x
x = 0
elif x > im_new.shape[1]: # object outside the cropped image
return None
if y < 0:
if y + h <= 0:
return None
h = h + y
y = 0
elif y > im_new.shape[0]: # object outside the cropped image
return None
if (x is not None) and (x + w > im_new.shape[1]): # box outside the cropped image
w = im_new.shape[1] - x
if (y is not None) and (y + h > im_new.shape[0]): # box outside the cropped image
h = im_new.shape[0] - y
if (w / (h + 1.) > thresh_wh2) or (h / (w + 1.) > thresh_wh2): # object shape strange: too narrow
# tl.logging.info('xx', w, h)
return None
if (w / (im_new.shape[1] * 1.) < thresh_wh) or (h / (im_new.shape[0] * 1.) <
thresh_wh): # object shape strange: too narrow
# tl.logging.info('yy', w, im_new.shape[1], h, im_new.shape[0])
return None
coord = [x, y, w, h]
# convert back if input format is center.
if is_center:
coord = obj_box_coord_upleft_to_centroid(coord)
return coord
coords_new = list()
classes_new = list()
for i, _ in enumerate(coords):
coord = coords[i]
if len(coord) != 4:
raise AssertionError("coordinate should be 4 values : [x, y, w, h]")
if is_rescale:
# for scaled coord, upscaled before process and scale back in the end.
coord = obj_box_coord_scale_to_pixelunit(coord, im.shape)
coord = _get_coord(coord)
if coord is not None:
coord = obj_box_coord_rescale(coord, im_new.shape)
coords_new.append(coord)
classes_new.append(classes[i])
else:
coord = _get_coord(coord)
if coord is not None:
coords_new.append(coord)
classes_new.append(classes[i])
return im_new, classes_new, coords_new |
def pad_sequences(sequences, maxlen=None, dtype='int32', padding='post', truncating='pre', value=0.):
"""Pads each sequence to the same length:
the length of the longest sequence.
If maxlen is provided, any sequence longer
than maxlen is truncated to maxlen.
Truncation happens off either the beginning (default) or
the end of the sequence.
Supports post-padding and pre-padding (default).
Parameters
----------
sequences : list of list of int
All sequences where each row is a sequence.
maxlen : int
Maximum length.
dtype : numpy.dtype or str
Data type to cast the resulting sequence.
padding : str
Either 'pre' or 'post', pad either before or after each sequence.
truncating : str
Either 'pre' or 'post', remove values from sequences larger than maxlen either in the beginning or in the end of the sequence
value : float
Value to pad the sequences to the desired value.
Returns
----------
x : numpy.array
With dimensions (number_of_sequences, maxlen)
Examples
----------
>>> sequences = [[1,1,1,1,1],[2,2,2],[3,3]]
>>> sequences = pad_sequences(sequences, maxlen=None, dtype='int32',
... padding='post', truncating='pre', value=0.)
[[1 1 1 1 1]
[2 2 2 0 0]
[3 3 0 0 0]]
"""
lengths = [len(s) for s in sequences]
nb_samples = len(sequences)
if maxlen is None:
maxlen = np.max(lengths)
# take the sample shape from the first non empty sequence
# checking for consistency in the main loop below.
sample_shape = tuple()
for s in sequences:
if len(s) > 0:
sample_shape = np.asarray(s).shape[1:]
break
x = (np.ones((nb_samples, maxlen) + sample_shape) * value).astype(dtype)
for idx, s in enumerate(sequences):
if len(s) == 0:
continue # empty list was found
if truncating == 'pre':
trunc = s[-maxlen:]
elif truncating == 'post':
trunc = s[:maxlen]
else:
raise ValueError('Truncating type "%s" not understood' % truncating)
# check `trunc` has expected shape
trunc = np.asarray(trunc, dtype=dtype)
if trunc.shape[1:] != sample_shape:
raise ValueError(
'Shape of sample %s of sequence at position %s is different from expected shape %s' %
(trunc.shape[1:], idx, sample_shape)
)
if padding == 'post':
x[idx, :len(trunc)] = trunc
elif padding == 'pre':
x[idx, -len(trunc):] = trunc
else:
raise ValueError('Padding type "%s" not understood' % padding)
return x.tolist() |
def remove_pad_sequences(sequences, pad_id=0):
"""Remove padding.
Parameters
-----------
sequences : list of list of int
All sequences where each row is a sequence.
pad_id : int
The pad ID.
Returns
----------
list of list of int
The processed sequences.
Examples
----------
>>> sequences = [[2,3,4,0,0], [5,1,2,3,4,0,0,0], [4,5,0,2,4,0,0,0]]
>>> print(remove_pad_sequences(sequences, pad_id=0))
[[2, 3, 4], [5, 1, 2, 3, 4], [4, 5, 0, 2, 4]]
"""
sequences_out = copy.deepcopy(sequences)
for i, _ in enumerate(sequences):
# for j in range(len(sequences[i])):
# if sequences[i][j] == pad_id:
# sequences_out[i] = sequences_out[i][:j]
# break
for j in range(1, len(sequences[i])):
if sequences[i][-j] != pad_id:
sequences_out[i] = sequences_out[i][0:-j + 1]
break
return sequences_out |
def process_sequences(sequences, end_id=0, pad_val=0, is_shorten=True, remain_end_id=False):
"""Set all tokens(ids) after END token to the padding value, and then shorten (option) it to the maximum sequence length in this batch.
Parameters
-----------
sequences : list of list of int
All sequences where each row is a sequence.
end_id : int
The special token for END.
pad_val : int
Replace the `end_id` and the IDs after `end_id` to this value.
is_shorten : boolean
Shorten the sequences. Default is True.
remain_end_id : boolean
Keep an `end_id` in the end. Default is False.
Returns
----------
list of list of int
The processed sequences.
Examples
---------
>>> sentences_ids = [[4, 3, 5, 3, 2, 2, 2, 2], <-- end_id is 2
... [5, 3, 9, 4, 9, 2, 2, 3]] <-- end_id is 2
>>> sentences_ids = precess_sequences(sentences_ids, end_id=vocab.end_id, pad_val=0, is_shorten=True)
[[4, 3, 5, 3, 0], [5, 3, 9, 4, 9]]
"""
max_length = 0
for _, seq in enumerate(sequences):
is_end = False
for i_w, n in enumerate(seq):
if n == end_id and is_end == False: # 1st time to see end_id
is_end = True
if max_length < i_w:
max_length = i_w
if remain_end_id is False:
seq[i_w] = pad_val # set end_id to pad_val
elif is_end ==True:
seq[i_w] = pad_val
if remain_end_id is True:
max_length += 1
if is_shorten:
for i, seq in enumerate(sequences):
sequences[i] = seq[:max_length]
return sequences |
def sequences_add_start_id(sequences, start_id=0, remove_last=False):
"""Add special start token(id) in the beginning of each sequence.
Parameters
------------
sequences : list of list of int
All sequences where each row is a sequence.
start_id : int
The start ID.
remove_last : boolean
Remove the last value of each sequences. Usually be used for removing the end ID.
Returns
----------
list of list of int
The processed sequences.
Examples
---------
>>> sentences_ids = [[4,3,5,3,2,2,2,2], [5,3,9,4,9,2,2,3]]
>>> sentences_ids = sequences_add_start_id(sentences_ids, start_id=2)
[[2, 4, 3, 5, 3, 2, 2, 2, 2], [2, 5, 3, 9, 4, 9, 2, 2, 3]]
>>> sentences_ids = sequences_add_start_id(sentences_ids, start_id=2, remove_last=True)
[[2, 4, 3, 5, 3, 2, 2, 2], [2, 5, 3, 9, 4, 9, 2, 2]]
For Seq2seq
>>> input = [a, b, c]
>>> target = [x, y, z]
>>> decode_seq = [start_id, a, b] <-- sequences_add_start_id(input, start_id, True)
"""
sequences_out = [[] for _ in range(len(sequences))] #[[]] * len(sequences)
for i, _ in enumerate(sequences):
if remove_last:
sequences_out[i] = [start_id] + sequences[i][:-1]
else:
sequences_out[i] = [start_id] + sequences[i]
return sequences_out |
def sequences_add_end_id(sequences, end_id=888):
"""Add special end token(id) in the end of each sequence.
Parameters
-----------
sequences : list of list of int
All sequences where each row is a sequence.
end_id : int
The end ID.
Returns
----------
list of list of int
The processed sequences.
Examples
---------
>>> sequences = [[1,2,3],[4,5,6,7]]
>>> print(sequences_add_end_id(sequences, end_id=999))
[[1, 2, 3, 999], [4, 5, 6, 999]]
"""
sequences_out = [[] for _ in range(len(sequences))] #[[]] * len(sequences)
for i, _ in enumerate(sequences):
sequences_out[i] = sequences[i] + [end_id]
return sequences_out |
def sequences_add_end_id_after_pad(sequences, end_id=888, pad_id=0):
"""Add special end token(id) in the end of each sequence.
Parameters
-----------
sequences : list of list of int
All sequences where each row is a sequence.
end_id : int
The end ID.
pad_id : int
The pad ID.
Returns
----------
list of list of int
The processed sequences.
Examples
---------
>>> sequences = [[1,2,0,0], [1,2,3,0], [1,2,3,4]]
>>> print(sequences_add_end_id_after_pad(sequences, end_id=99, pad_id=0))
[[1, 2, 99, 0], [1, 2, 3, 99], [1, 2, 3, 4]]
"""
# sequences_out = [[] for _ in range(len(sequences))]#[[]] * len(sequences)
sequences_out = copy.deepcopy(sequences)
# # add a pad to all
# for i in range(len(sequences)):
# for j in range(len(sequences[i])):
# sequences_out[i].append(pad_id)
# # pad -- > end
# max_len = 0
for i, v in enumerate(sequences):
for j, _v2 in enumerate(v):
if sequences[i][j] == pad_id:
sequences_out[i][j] = end_id
# if j > max_len:
# max_len = j
break
# # remove pad if too long
# for i in range(len(sequences)):
# for j in range(len(sequences[i])):
# sequences_out[i] = sequences_out[i][:max_len+1]
return sequences_out |
def sequences_get_mask(sequences, pad_val=0):
"""Return mask for sequences.
Parameters
-----------
sequences : list of list of int
All sequences where each row is a sequence.
pad_val : int
The pad value.
Returns
----------
list of list of int
The mask.
Examples
---------
>>> sentences_ids = [[4, 0, 5, 3, 0, 0],
... [5, 3, 9, 4, 9, 0]]
>>> mask = sequences_get_mask(sentences_ids, pad_val=0)
[[1 1 1 1 0 0]
[1 1 1 1 1 0]]
"""
mask = np.ones_like(sequences)
for i, seq in enumerate(sequences):
for i_w in reversed(range(len(seq))):
if seq[i_w] == pad_val:
mask[i, i_w] = 0
else:
break # <-- exit the for loop, prepcess next sequence
return mask |
def keypoint_random_crop(image, annos, mask=None, size=(368, 368)):
"""Randomly crop an image and corresponding keypoints without influence scales, given by ``keypoint_random_resize_shortestedge``.
Parameters
-----------
image : 3 channel image
The given image for augmentation.
annos : list of list of floats
The keypoints annotation of people.
mask : single channel image or None
The mask if available.
size : tuple of int
The size of returned image.
Returns
----------
preprocessed image, annotation, mask
"""
_target_height = size[0]
_target_width = size[1]
target_size = (_target_width, _target_height)
if len(np.shape(image)) == 2:
image = cv2.cvtColor(image, cv2.COLOR_GRAY2RGB)
height, width, _ = np.shape(image)
for _ in range(50):
x = random.randrange(0, width - target_size[0]) if width > target_size[0] else 0
y = random.randrange(0, height - target_size[1]) if height > target_size[1] else 0
# check whether any face is inside the box to generate a reasonably-balanced datasets
for joint in annos:
if x <= joint[0][0] < x + target_size[0] and y <= joint[0][1] < y + target_size[1]:
break
def pose_crop(image, annos, mask, x, y, w, h): # TODO : speed up with affine transform
# adjust image
target_size = (w, h)
img = image
resized = img[y:y + target_size[1], x:x + target_size[0], :]
resized_mask = mask[y:y + target_size[1], x:x + target_size[0]]
# adjust meta data
adjust_joint_list = []
for joint in annos:
adjust_joint = []
for point in joint:
if point[0] < -10 or point[1] < -10:
adjust_joint.append((-1000, -1000))
continue
new_x, new_y = point[0] - x, point[1] - y
# should not crop outside the image
if new_x > w - 1 or new_y > h - 1:
adjust_joint.append((-1000, -1000))
continue
adjust_joint.append((new_x, new_y))
adjust_joint_list.append(adjust_joint)
return resized, adjust_joint_list, resized_mask
return pose_crop(image, annos, mask, x, y, target_size[0], target_size[1]) |
def keypoint_resize_random_crop(image, annos, mask=None, size=(368, 368)):
"""Reszie the image to make either its width or height equals to the given sizes.
Then randomly crop image without influence scales.
Resize the image match with the minimum size before cropping, this API will change the zoom scale of object.
Parameters
-----------
image : 3 channel image
The given image for augmentation.
annos : list of list of floats
The keypoints annotation of people.
mask : single channel image or None
The mask if available.
size : tuple of int
The size (height, width) of returned image.
Returns
----------
preprocessed image, annos, mask
"""
if len(np.shape(image)) == 2:
image = cv2.cvtColor(image, cv2.COLOR_GRAY2RGB)
def resize_image(image, annos, mask, target_width, target_height):
"""Reszie image
Parameters
-----------
image : 3 channel image
The given image.
annos : list of list of floats
Keypoints of people
mask : single channel image or None
The mask if available.
target_width : int
Expected width of returned image.
target_height : int
Expected height of returned image.
Returns
----------
preprocessed input image, annos, mask
"""
y, x, _ = np.shape(image)
ratio_y = target_height / y
ratio_x = target_width / x
new_joints = []
# update meta
for people in annos:
new_keypoints = []
for keypoints in people:
if keypoints[0] < 0 or keypoints[1] < 0:
new_keypoints.append((-1000, -1000))
continue
pts = (int(keypoints[0] * ratio_x + 0.5), int(keypoints[1] * ratio_y + 0.5))
if pts[0] > target_width - 1 or pts[1] > target_height - 1:
new_keypoints.append((-1000, -1000))
continue
new_keypoints.append(pts)
new_joints.append(new_keypoints)
annos = new_joints
new_image = cv2.resize(image, (target_width, target_height), interpolation=cv2.INTER_AREA)
if mask is not None:
new_mask = cv2.resize(mask, (target_width, target_height), interpolation=cv2.INTER_AREA)
return new_image, annos, new_mask
else:
return new_image, annos, None
_target_height = size[0]
_target_width = size[1]
if len(np.shape(image)) == 2:
image = cv2.cvtColor(image, cv2.COLOR_GRAY2RGB)
height, width, _ = np.shape(image)
# print("the size of original img is:", height, width)
if height <= width:
ratio = _target_height / height
new_width = int(ratio * width)
if height == width:
new_width = _target_height
image, annos, mask = resize_image(image, annos, mask, new_width, _target_height)
# for i in annos:
# if len(i) is not 19:
# print('Joints of person is not 19 ERROR FROM RESIZE')
if new_width > _target_width:
crop_range_x = np.random.randint(0, new_width - _target_width)
else:
crop_range_x = 0
image = image[:, crop_range_x:crop_range_x + _target_width, :]
if mask is not None:
mask = mask[:, crop_range_x:crop_range_x + _target_width]
# joint_list= []
new_joints = []
#annos-pepople-joints (must be 19 or [])
for people in annos:
# print("number of keypoints is", np.shape(people))
new_keypoints = []
for keypoints in people:
if keypoints[0] < -10 or keypoints[1] < -10:
new_keypoints.append((-1000, -1000))
continue
top = crop_range_x + _target_width - 1
if keypoints[0] >= crop_range_x and keypoints[0] <= top:
# pts = (keypoints[0]-crop_range_x, keypoints[1])
pts = (int(keypoints[0] - crop_range_x), int(keypoints[1]))
else:
pts = (-1000, -1000)
new_keypoints.append(pts)
new_joints.append(new_keypoints)
# if len(new_keypoints) != 19:
# print('1:The Length of joints list should be 0 or 19 but actually:', len(new_keypoints))
annos = new_joints
if height > width:
ratio = _target_width / width
new_height = int(ratio * height)
image, annos, mask = resize_image(image, annos, mask, _target_width, new_height)
# for i in annos:
# if len(i) is not 19:
# print('Joints of person is not 19 ERROR')
if new_height > _target_height:
crop_range_y = np.random.randint(0, new_height - _target_height)
else:
crop_range_y = 0
image = image[crop_range_y:crop_range_y + _target_width, :, :]
if mask is not None:
mask = mask[crop_range_y:crop_range_y + _target_width, :]
new_joints = []
for people in annos: # TODO : speed up with affine transform
new_keypoints = []
for keypoints in people:
# case orginal points are not usable
if keypoints[0] < 0 or keypoints[1] < 0:
new_keypoints.append((-1000, -1000))
continue
# y axis coordinate change
bot = crop_range_y + _target_height - 1
if keypoints[1] >= crop_range_y and keypoints[1] <= bot:
# pts = (keypoints[0], keypoints[1]-crop_range_y)
pts = (int(keypoints[0]), int(keypoints[1] - crop_range_y))
# if pts[0]>367 or pts[1]>367:
# print('Error2')
else:
pts = (-1000, -1000)
new_keypoints.append(pts)
new_joints.append(new_keypoints)
# if len(new_keypoints) != 19:
# print('2:The Length of joints list should be 0 or 19 but actually:', len(new_keypoints))
annos = new_joints
# mask = cv2.resize(mask, (46, 46), interpolation=cv2.INTER_AREA)
if mask is not None:
return image, annos, mask
else:
return image, annos, None |
def keypoint_random_rotate(image, annos, mask=None, rg=15.):
"""Rotate an image and corresponding keypoints.
Parameters
-----------
image : 3 channel image
The given image for augmentation.
annos : list of list of floats
The keypoints annotation of people.
mask : single channel image or None
The mask if available.
rg : int or float
Degree to rotate, usually 0 ~ 180.
Returns
----------
preprocessed image, annos, mask
"""
def _rotate_coord(shape, newxy, point, angle):
angle = -1 * angle / 180.0 * math.pi
ox, oy = shape
px, py = point
ox /= 2
oy /= 2
qx = math.cos(angle) * (px - ox) - math.sin(angle) * (py - oy)
qy = math.sin(angle) * (px - ox) + math.cos(angle) * (py - oy)
new_x, new_y = newxy
qx += ox - new_x
qy += oy - new_y
return int(qx + 0.5), int(qy + 0.5)
def _largest_rotated_rect(w, h, angle):
"""
Get largest rectangle after rotation.
http://stackoverflow.com/questions/16702966/rotate-image-and-crop-out-black-borders
"""
angle = angle / 180.0 * math.pi
if w <= 0 or h <= 0:
return 0, 0
width_is_longer = w >= h
side_long, side_short = (w, h) if width_is_longer else (h, w)
# since the solutions for angle, -angle and 180-angle are all the same,
# if suffices to look at the first quadrant and the absolute values of sin,cos:
sin_a, cos_a = abs(math.sin(angle)), abs(math.cos(angle))
if side_short <= 2. * sin_a * cos_a * side_long:
# half constrained case: two crop corners touch the longer side,
# the other two corners are on the mid-line parallel to the longer line
x = 0.5 * side_short
wr, hr = (x / sin_a, x / cos_a) if width_is_longer else (x / cos_a, x / sin_a)
else:
# fully constrained case: crop touches all 4 sides
cos_2a = cos_a * cos_a - sin_a * sin_a
wr, hr = (w * cos_a - h * sin_a) / cos_2a, (h * cos_a - w * sin_a) / cos_2a
return int(np.round(wr)), int(np.round(hr))
img_shape = np.shape(image)
height = img_shape[0]
width = img_shape[1]
deg = np.random.uniform(-rg, rg)
img = image
center = (img.shape[1] * 0.5, img.shape[0] * 0.5) # x, y
rot_m = cv2.getRotationMatrix2D((int(center[0]), int(center[1])), deg, 1)
ret = cv2.warpAffine(img, rot_m, img.shape[1::-1], flags=cv2.INTER_AREA, borderMode=cv2.BORDER_CONSTANT)
if img.ndim == 3 and ret.ndim == 2:
ret = ret[:, :, np.newaxis]
neww, newh = _largest_rotated_rect(ret.shape[1], ret.shape[0], deg)
neww = min(neww, ret.shape[1])
newh = min(newh, ret.shape[0])
newx = int(center[0] - neww * 0.5)
newy = int(center[1] - newh * 0.5)
# print(ret.shape, deg, newx, newy, neww, newh)
img = ret[newy:newy + newh, newx:newx + neww]
# adjust meta data
adjust_joint_list = []
for joint in annos: # TODO : speed up with affine transform
adjust_joint = []
for point in joint:
if point[0] < -100 or point[1] < -100:
adjust_joint.append((-1000, -1000))
continue
x, y = _rotate_coord((width, height), (newx, newy), point, deg)
if x > neww - 1 or y > newh - 1:
adjust_joint.append((-1000, -1000))
continue
if x < 0 or y < 0:
adjust_joint.append((-1000, -1000))
continue
adjust_joint.append((x, y))
adjust_joint_list.append(adjust_joint)
joint_list = adjust_joint_list
if mask is not None:
msk = mask
center = (msk.shape[1] * 0.5, msk.shape[0] * 0.5) # x, y
rot_m = cv2.getRotationMatrix2D((int(center[0]), int(center[1])), deg, 1)
ret = cv2.warpAffine(msk, rot_m, msk.shape[1::-1], flags=cv2.INTER_AREA, borderMode=cv2.BORDER_CONSTANT)
if msk.ndim == 3 and msk.ndim == 2:
ret = ret[:, :, np.newaxis]
neww, newh = _largest_rotated_rect(ret.shape[1], ret.shape[0], deg)
neww = min(neww, ret.shape[1])
newh = min(newh, ret.shape[0])
newx = int(center[0] - neww * 0.5)
newy = int(center[1] - newh * 0.5)
# print(ret.shape, deg, newx, newy, neww, newh)
msk = ret[newy:newy + newh, newx:newx + neww]
return img, joint_list, msk
else:
return img, joint_list, None |
def keypoint_random_flip(
image, annos, mask=None, prob=0.5, flip_list=(0, 1, 5, 6, 7, 2, 3, 4, 11, 12, 13, 8, 9, 10, 15, 14, 17, 16, 18)
):
"""Flip an image and corresponding keypoints.
Parameters
-----------
image : 3 channel image
The given image for augmentation.
annos : list of list of floats
The keypoints annotation of people.
mask : single channel image or None
The mask if available.
prob : float, 0 to 1
The probability to flip the image, if 1, always flip the image.
flip_list : tuple of int
Denotes how the keypoints number be changed after flipping which is required for pose estimation task.
The left and right body should be maintained rather than switch.
(Default COCO format).
Set to an empty tuple if you don't need to maintain left and right information.
Returns
----------
preprocessed image, annos, mask
"""
_prob = np.random.uniform(0, 1.0)
if _prob < prob:
return image, annos, mask
_, width, _ = np.shape(image)
image = cv2.flip(image, 1)
mask = cv2.flip(mask, 1)
new_joints = []
for people in annos: # TODO : speed up with affine transform
new_keypoints = []
for k in flip_list:
point = people[k]
if point[0] < 0 or point[1] < 0:
new_keypoints.append((-1000, -1000))
continue
if point[0] > image.shape[1] - 1 or point[1] > image.shape[0] - 1:
new_keypoints.append((-1000, -1000))
continue
if (width - point[0]) > image.shape[1] - 1:
new_keypoints.append((-1000, -1000))
continue
new_keypoints.append((width - point[0], point[1]))
new_joints.append(new_keypoints)
annos = new_joints
return image, annos, mask |
def keypoint_random_resize(image, annos, mask=None, zoom_range=(0.8, 1.2)):
"""Randomly resize an image and corresponding keypoints.
The height and width of image will be changed independently, so the scale will be changed.
Parameters
-----------
image : 3 channel image
The given image for augmentation.
annos : list of list of floats
The keypoints annotation of people.
mask : single channel image or None
The mask if available.
zoom_range : tuple of two floats
The minimum and maximum factor to zoom in or out, e.g (0.5, 1) means zoom out 1~2 times.
Returns
----------
preprocessed image, annos, mask
"""
height = image.shape[0]
width = image.shape[1]
_min, _max = zoom_range
scalew = np.random.uniform(_min, _max)
scaleh = np.random.uniform(_min, _max)
neww = int(width * scalew)
newh = int(height * scaleh)
dst = cv2.resize(image, (neww, newh), interpolation=cv2.INTER_AREA)
if mask is not None:
mask = cv2.resize(mask, (neww, newh), interpolation=cv2.INTER_AREA)
# adjust meta data
adjust_joint_list = []
for joint in annos: # TODO : speed up with affine transform
adjust_joint = []
for point in joint:
if point[0] < -100 or point[1] < -100:
adjust_joint.append((-1000, -1000))
continue
adjust_joint.append((int(point[0] * scalew + 0.5), int(point[1] * scaleh + 0.5)))
adjust_joint_list.append(adjust_joint)
if mask is not None:
return dst, adjust_joint_list, mask
else:
return dst, adjust_joint_list, None |
def Vgg19(rgb):
"""
Build the VGG 19 Model
Parameters
-----------
rgb : rgb image placeholder [batch, height, width, 3] values scaled [0, 1]
"""
start_time = time.time()
print("build model started")
rgb_scaled = rgb * 255.0
# Convert RGB to BGR
red, green, blue = tf.split(rgb_scaled, 3, 3)
if red.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
if green.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
if blue.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
bgr = tf.concat([
blue - VGG_MEAN[0],
green - VGG_MEAN[1],
red - VGG_MEAN[2],
], axis=3)
if bgr.get_shape().as_list()[1:] != [224, 224, 3]:
raise Exception("image size unmatch")
# input layer
net_in = InputLayer(bgr, name='input')
# conv1
net = Conv2dLayer(net_in, act=tf.nn.relu, shape=[3, 3, 3, 64], strides=[1, 1, 1, 1], padding='SAME', name='conv1_1')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 64, 64], strides=[1, 1, 1, 1], padding='SAME', name='conv1_2')
net = PoolLayer(net, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME', pool=tf.nn.max_pool, name='pool1')
# conv2
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 64, 128], strides=[1, 1, 1, 1], padding='SAME', name='conv2_1')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 128, 128], strides=[1, 1, 1, 1], padding='SAME', name='conv2_2')
net = PoolLayer(net, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME', pool=tf.nn.max_pool, name='pool2')
# conv3
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 128, 256], strides=[1, 1, 1, 1], padding='SAME', name='conv3_1')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 256, 256], strides=[1, 1, 1, 1], padding='SAME', name='conv3_2')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 256, 256], strides=[1, 1, 1, 1], padding='SAME', name='conv3_3')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 256, 256], strides=[1, 1, 1, 1], padding='SAME', name='conv3_4')
net = PoolLayer(net, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME', pool=tf.nn.max_pool, name='pool3')
# conv4
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 256, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv4_1')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv4_2')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv4_3')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv4_4')
net = PoolLayer(net, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME', pool=tf.nn.max_pool, name='pool4')
# conv5
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv5_1')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv5_2')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv5_3')
net = Conv2dLayer(net, act=tf.nn.relu, shape=[3, 3, 512, 512], strides=[1, 1, 1, 1], padding='SAME', name='conv5_4')
net = PoolLayer(net, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME', pool=tf.nn.max_pool, name='pool5')
# fc 6~8
net = FlattenLayer(net, name='flatten')
net = DenseLayer(net, n_units=4096, act=tf.nn.relu, name='fc6')
net = DenseLayer(net, n_units=4096, act=tf.nn.relu, name='fc7')
net = DenseLayer(net, n_units=1000, act=None, name='fc8')
print("build model finished: %fs" % (time.time() - start_time))
return net |
def Vgg19_simple_api(rgb):
"""
Build the VGG 19 Model
Parameters
-----------
rgb : rgb image placeholder [batch, height, width, 3] values scaled [0, 1]
"""
start_time = time.time()
print("build model started")
rgb_scaled = rgb * 255.0
# Convert RGB to BGR
red, green, blue = tf.split(rgb_scaled, 3, 3)
if red.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
if green.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
if blue.get_shape().as_list()[1:] != [224, 224, 1]:
raise Exception("image size unmatch")
bgr = tf.concat([
blue - VGG_MEAN[0],
green - VGG_MEAN[1],
red - VGG_MEAN[2],
], axis=3)
if bgr.get_shape().as_list()[1:] != [224, 224, 3]:
raise Exception("image size unmatch")
# input layer
net_in = InputLayer(bgr, name='input')
# conv1
net = Conv2d(net_in, 64, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv1_1')
net = Conv2d(net, n_filter=64, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv1_2')
net = MaxPool2d(net, filter_size=(2, 2), strides=(2, 2), padding='SAME', name='pool1')
# conv2
net = Conv2d(net, n_filter=128, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv2_1')
net = Conv2d(net, n_filter=128, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv2_2')
net = MaxPool2d(net, filter_size=(2, 2), strides=(2, 2), padding='SAME', name='pool2')
# conv3
net = Conv2d(net, n_filter=256, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv3_1')
net = Conv2d(net, n_filter=256, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv3_2')
net = Conv2d(net, n_filter=256, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv3_3')
net = Conv2d(net, n_filter=256, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv3_4')
net = MaxPool2d(net, filter_size=(2, 2), strides=(2, 2), padding='SAME', name='pool3')
# conv4
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv4_1')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv4_2')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv4_3')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv4_4')
net = MaxPool2d(net, filter_size=(2, 2), strides=(2, 2), padding='SAME', name='pool4')
# conv5
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv5_1')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv5_2')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv5_3')
net = Conv2d(net, n_filter=512, filter_size=(3, 3), strides=(1, 1), act=tf.nn.relu, padding='SAME', name='conv5_4')
net = MaxPool2d(net, filter_size=(2, 2), strides=(2, 2), padding='SAME', name='pool5')
# fc 6~8
net = FlattenLayer(net, name='flatten')
net = DenseLayer(net, n_units=4096, act=tf.nn.relu, name='fc6')
net = DenseLayer(net, n_units=4096, act=tf.nn.relu, name='fc7')
net = DenseLayer(net, n_units=1000, act=None, name='fc8')
print("build model finished: %fs" % (time.time() - start_time))
return net |
def prepro(I):
"""Prepro 210x160x3 uint8 frame into 6400 (80x80) 1D float vector."""
I = I[35:195]
I = I[::2, ::2, 0]
I[I == 144] = 0
I[I == 109] = 0
I[I != 0] = 1
return I.astype(np.float).ravel() |
def discount_episode_rewards(rewards=None, gamma=0.99, mode=0):
"""Take 1D float array of rewards and compute discounted rewards for an
episode. When encount a non-zero value, consider as the end a of an episode.
Parameters
----------
rewards : list
List of rewards
gamma : float
Discounted factor
mode : int
Mode for computing the discount rewards.
- If mode == 0, reset the discount process when encount a non-zero reward (Ping-pong game).
- If mode == 1, would not reset the discount process.
Returns
--------
list of float
The discounted rewards.
Examples
----------
>>> rewards = np.asarray([0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1])
>>> gamma = 0.9
>>> discount_rewards = tl.rein.discount_episode_rewards(rewards, gamma)
>>> print(discount_rewards)
[ 0.72899997 0.81 0.89999998 1. 0.72899997 0.81
0.89999998 1. 0.72899997 0.81 0.89999998 1. ]
>>> discount_rewards = tl.rein.discount_episode_rewards(rewards, gamma, mode=1)
>>> print(discount_rewards)
[ 1.52110755 1.69011939 1.87791049 2.08656716 1.20729685 1.34144104
1.49048996 1.65610003 0.72899997 0.81 0.89999998 1. ]
"""
if rewards is None:
raise Exception("rewards should be a list")
discounted_r = np.zeros_like(rewards, dtype=np.float32)
running_add = 0
for t in reversed(xrange(0, rewards.size)):
if mode == 0:
if rewards[t] != 0: running_add = 0
running_add = running_add * gamma + rewards[t]
discounted_r[t] = running_add
return discounted_r |
def cross_entropy_reward_loss(logits, actions, rewards, name=None):
"""Calculate the loss for Policy Gradient Network.
Parameters
----------
logits : tensor
The network outputs without softmax. This function implements softmax inside.
actions : tensor or placeholder
The agent actions.
rewards : tensor or placeholder
The rewards.
Returns
--------
Tensor
The TensorFlow loss function.
Examples
----------
>>> states_batch_pl = tf.placeholder(tf.float32, shape=[None, D])
>>> network = InputLayer(states_batch_pl, name='input')
>>> network = DenseLayer(network, n_units=H, act=tf.nn.relu, name='relu1')
>>> network = DenseLayer(network, n_units=3, name='out')
>>> probs = network.outputs
>>> sampling_prob = tf.nn.softmax(probs)
>>> actions_batch_pl = tf.placeholder(tf.int32, shape=[None])
>>> discount_rewards_batch_pl = tf.placeholder(tf.float32, shape=[None])
>>> loss = tl.rein.cross_entropy_reward_loss(probs, actions_batch_pl, discount_rewards_batch_pl)
>>> train_op = tf.train.RMSPropOptimizer(learning_rate, decay_rate).minimize(loss)
"""
cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(labels=actions, logits=logits, name=name)
return tf.reduce_sum(tf.multiply(cross_entropy, rewards)) |
def log_weight(probs, weights, name='log_weight'):
"""Log weight.
Parameters
-----------
probs : tensor
If it is a network output, usually we should scale it to [0, 1] via softmax.
weights : tensor
The weights.
Returns
--------
Tensor
The Tensor after appling the log weighted expression.
"""
with tf.variable_scope(name):
exp_v = tf.reduce_mean(tf.log(probs) * weights)
return exp_v |
def choice_action_by_probs(probs=(0.5, 0.5), action_list=None):
"""Choice and return an an action by given the action probability distribution.
Parameters
------------
probs : list of float.
The probability distribution of all actions.
action_list : None or a list of int or others
A list of action in integer, string or others. If None, returns an integer range between 0 and len(probs)-1.
Returns
--------
float int or str
The chosen action.
Examples
----------
>>> for _ in range(5):
>>> a = choice_action_by_probs([0.2, 0.4, 0.4])
>>> print(a)
0
1
1
2
1
>>> for _ in range(3):
>>> a = choice_action_by_probs([0.5, 0.5], ['a', 'b'])
>>> print(a)
a
b
b
"""
if action_list is None:
n_action = len(probs)
action_list = np.arange(n_action)
else:
if len(action_list) != len(probs):
raise Exception("number of actions should equal to number of probabilities.")
return np.random.choice(action_list, p=probs) |
def cross_entropy(output, target, name=None):
"""Softmax cross-entropy operation, returns the TensorFlow expression of cross-entropy for two distributions,
it implements softmax internally. See ``tf.nn.sparse_softmax_cross_entropy_with_logits``.
Parameters
----------
output : Tensor
A batch of distribution with shape: [batch_size, num of classes].
target : Tensor
A batch of index with shape: [batch_size, ].
name : string
Name of this loss.
Examples
--------
>>> ce = tl.cost.cross_entropy(y_logits, y_target_logits, 'my_loss')
References
-----------
- About cross-entropy: `<https://en.wikipedia.org/wiki/Cross_entropy>`__.
- The code is borrowed from: `<https://en.wikipedia.org/wiki/Cross_entropy>`__.
"""
if name is None:
raise Exception("Please give a unique name to tl.cost.cross_entropy for TF1.0+")
return tf.reduce_mean(tf.nn.sparse_softmax_cross_entropy_with_logits(labels=target, logits=output), name=name) |
def sigmoid_cross_entropy(output, target, name=None):
"""Sigmoid cross-entropy operation, see ``tf.nn.sigmoid_cross_entropy_with_logits``.
Parameters
----------
output : Tensor
A batch of distribution with shape: [batch_size, num of classes].
target : Tensor
A batch of index with shape: [batch_size, ].
name : string
Name of this loss.
"""
return tf.reduce_mean(tf.nn.sigmoid_cross_entropy_with_logits(labels=target, logits=output), name=name) |
def binary_cross_entropy(output, target, epsilon=1e-8, name='bce_loss'):
"""Binary cross entropy operation.
Parameters
----------
output : Tensor
Tensor with type of `float32` or `float64`.
target : Tensor
The target distribution, format the same with `output`.
epsilon : float
A small value to avoid output to be zero.
name : str
An optional name to attach to this function.
References
-----------
- `ericjang-DRAW <https://github.com/ericjang/draw/blob/master/draw.py#L73>`__
"""
# with ops.op_scope([output, target], name, "bce_loss") as name:
# output = ops.convert_to_tensor(output, name="preds")
# target = ops.convert_to_tensor(targets, name="target")
# with tf.name_scope(name):
return tf.reduce_mean(
tf.reduce_sum(-(target * tf.log(output + epsilon) + (1. - target) * tf.log(1. - output + epsilon)), axis=1),
name=name
) |
def mean_squared_error(output, target, is_mean=False, name="mean_squared_error"):
"""Return the TensorFlow expression of mean-square-error (L2) of two batch of data.
Parameters
----------
output : Tensor
2D, 3D or 4D tensor i.e. [batch_size, n_feature], [batch_size, height, width] or [batch_size, height, width, channel].
target : Tensor
The target distribution, format the same with `output`.
is_mean : boolean
Whether compute the mean or sum for each example.
- If True, use ``tf.reduce_mean`` to compute the loss between one target and predict data.
- If False, use ``tf.reduce_sum`` (default).
name : str
An optional name to attach to this function.
References
------------
- `Wiki Mean Squared Error <https://en.wikipedia.org/wiki/Mean_squared_error>`__
"""
# with tf.name_scope(name):
if output.get_shape().ndims == 2: # [batch_size, n_feature]
if is_mean:
mse = tf.reduce_mean(tf.reduce_mean(tf.squared_difference(output, target), 1), name=name)
else:
mse = tf.reduce_mean(tf.reduce_sum(tf.squared_difference(output, target), 1), name=name)
elif output.get_shape().ndims == 3: # [batch_size, w, h]
if is_mean:
mse = tf.reduce_mean(tf.reduce_mean(tf.squared_difference(output, target), [1, 2]), name=name)
else:
mse = tf.reduce_mean(tf.reduce_sum(tf.squared_difference(output, target), [1, 2]), name=name)
elif output.get_shape().ndims == 4: # [batch_size, w, h, c]
if is_mean:
mse = tf.reduce_mean(tf.reduce_mean(tf.squared_difference(output, target), [1, 2, 3]), name=name)
else:
mse = tf.reduce_mean(tf.reduce_sum(tf.squared_difference(output, target), [1, 2, 3]), name=name)
else:
raise Exception("Unknow dimension")
return mse |
def normalized_mean_square_error(output, target, name="normalized_mean_squared_error_loss"):
"""Return the TensorFlow expression of normalized mean-square-error of two distributions.
Parameters
----------
output : Tensor
2D, 3D or 4D tensor i.e. [batch_size, n_feature], [batch_size, height, width] or [batch_size, height, width, channel].
target : Tensor
The target distribution, format the same with `output`.
name : str
An optional name to attach to this function.
"""
# with tf.name_scope("normalized_mean_squared_error_loss"):
if output.get_shape().ndims == 2: # [batch_size, n_feature]
nmse_a = tf.sqrt(tf.reduce_sum(tf.squared_difference(output, target), axis=1))
nmse_b = tf.sqrt(tf.reduce_sum(tf.square(target), axis=1))
elif output.get_shape().ndims == 3: # [batch_size, w, h]
nmse_a = tf.sqrt(tf.reduce_sum(tf.squared_difference(output, target), axis=[1, 2]))
nmse_b = tf.sqrt(tf.reduce_sum(tf.square(target), axis=[1, 2]))
elif output.get_shape().ndims == 4: # [batch_size, w, h, c]
nmse_a = tf.sqrt(tf.reduce_sum(tf.squared_difference(output, target), axis=[1, 2, 3]))
nmse_b = tf.sqrt(tf.reduce_sum(tf.square(target), axis=[1, 2, 3]))
nmse = tf.reduce_mean(nmse_a / nmse_b, name=name)
return nmse |
def absolute_difference_error(output, target, is_mean=False, name="absolute_difference_error_loss"):
"""Return the TensorFlow expression of absolute difference error (L1) of two batch of data.
Parameters
----------
output : Tensor
2D, 3D or 4D tensor i.e. [batch_size, n_feature], [batch_size, height, width] or [batch_size, height, width, channel].
target : Tensor
The target distribution, format the same with `output`.
is_mean : boolean
Whether compute the mean or sum for each example.
- If True, use ``tf.reduce_mean`` to compute the loss between one target and predict data.
- If False, use ``tf.reduce_sum`` (default).
name : str
An optional name to attach to this function.
"""
# with tf.name_scope("absolute_difference_error_loss"):
if output.get_shape().ndims == 2: # [batch_size, n_feature]
if is_mean:
loss = tf.reduce_mean(tf.reduce_mean(tf.abs(output - target), 1), name=name)
else:
loss = tf.reduce_mean(tf.reduce_sum(tf.abs(output - target), 1), name=name)
elif output.get_shape().ndims == 3: # [batch_size, w, h]
if is_mean:
loss = tf.reduce_mean(tf.reduce_mean(tf.abs(output - target), [1, 2]), name=name)
else:
loss = tf.reduce_mean(tf.reduce_sum(tf.abs(output - target), [1, 2]), name=name)
elif output.get_shape().ndims == 4: # [batch_size, w, h, c]
if is_mean:
loss = tf.reduce_mean(tf.reduce_mean(tf.abs(output - target), [1, 2, 3]), name=name)
else:
loss = tf.reduce_mean(tf.reduce_sum(tf.abs(output - target), [1, 2, 3]), name=name)
else:
raise Exception("Unknow dimension")
return loss |
def dice_coe(output, target, loss_type='jaccard', axis=(1, 2, 3), smooth=1e-5):
"""Soft dice (Sørensen or Jaccard) coefficient for comparing the similarity
of two batch of data, usually be used for binary image segmentation
i.e. labels are binary. The coefficient between 0 to 1, 1 means totally match.
Parameters
-----------
output : Tensor
A distribution with shape: [batch_size, ....], (any dimensions).
target : Tensor
The target distribution, format the same with `output`.
loss_type : str
``jaccard`` or ``sorensen``, default is ``jaccard``.
axis : tuple of int
All dimensions are reduced, default ``[1,2,3]``.
smooth : float
This small value will be added to the numerator and denominator.
- If both output and target are empty, it makes sure dice is 1.
- If either output or target are empty (all pixels are background), dice = ```smooth/(small_value + smooth)``, then if smooth is very small, dice close to 0 (even the image values lower than the threshold), so in this case, higher smooth can have a higher dice.
Examples
---------
>>> outputs = tl.act.pixel_wise_softmax(network.outputs)
>>> dice_loss = 1 - tl.cost.dice_coe(outputs, y_)
References
-----------
- `Wiki-Dice <https://en.wikipedia.org/wiki/Sørensen–Dice_coefficient>`__
"""
inse = tf.reduce_sum(output * target, axis=axis)
if loss_type == 'jaccard':
l = tf.reduce_sum(output * output, axis=axis)
r = tf.reduce_sum(target * target, axis=axis)
elif loss_type == 'sorensen':
l = tf.reduce_sum(output, axis=axis)
r = tf.reduce_sum(target, axis=axis)
else:
raise Exception("Unknow loss_type")
# old axis=[0,1,2,3]
# dice = 2 * (inse) / (l + r)
# epsilon = 1e-5
# dice = tf.clip_by_value(dice, 0, 1.0-epsilon) # if all empty, dice = 1
# new haodong
dice = (2. * inse + smooth) / (l + r + smooth)
##
dice = tf.reduce_mean(dice, name='dice_coe')
return dice |
def dice_hard_coe(output, target, threshold=0.5, axis=(1, 2, 3), smooth=1e-5):
"""Non-differentiable Sørensen–Dice coefficient for comparing the similarity
of two batch of data, usually be used for binary image segmentation i.e. labels are binary.
The coefficient between 0 to 1, 1 if totally match.
Parameters
-----------
output : tensor
A distribution with shape: [batch_size, ....], (any dimensions).
target : tensor
The target distribution, format the same with `output`.
threshold : float
The threshold value to be true.
axis : tuple of integer
All dimensions are reduced, default ``(1,2,3)``.
smooth : float
This small value will be added to the numerator and denominator, see ``dice_coe``.
References
-----------
- `Wiki-Dice <https://en.wikipedia.org/wiki/Sørensen–Dice_coefficient>`__
"""
output = tf.cast(output > threshold, dtype=tf.float32)
target = tf.cast(target > threshold, dtype=tf.float32)
inse = tf.reduce_sum(tf.multiply(output, target), axis=axis)
l = tf.reduce_sum(output, axis=axis)
r = tf.reduce_sum(target, axis=axis)
# old axis=[0,1,2,3]
# hard_dice = 2 * (inse) / (l + r)
# epsilon = 1e-5
# hard_dice = tf.clip_by_value(hard_dice, 0, 1.0-epsilon)
# new haodong
hard_dice = (2. * inse + smooth) / (l + r + smooth)
##
hard_dice = tf.reduce_mean(hard_dice, name='hard_dice')
return hard_dice |
def iou_coe(output, target, threshold=0.5, axis=(1, 2, 3), smooth=1e-5):
"""Non-differentiable Intersection over Union (IoU) for comparing the
similarity of two batch of data, usually be used for evaluating binary image segmentation.
The coefficient between 0 to 1, and 1 means totally match.
Parameters
-----------
output : tensor
A batch of distribution with shape: [batch_size, ....], (any dimensions).
target : tensor
The target distribution, format the same with `output`.
threshold : float
The threshold value to be true.
axis : tuple of integer
All dimensions are reduced, default ``(1,2,3)``.
smooth : float
This small value will be added to the numerator and denominator, see ``dice_coe``.
Notes
------
- IoU cannot be used as training loss, people usually use dice coefficient for training, IoU and hard-dice for evaluating.
"""
pre = tf.cast(output > threshold, dtype=tf.float32)
truth = tf.cast(target > threshold, dtype=tf.float32)
inse = tf.reduce_sum(tf.multiply(pre, truth), axis=axis) # AND
union = tf.reduce_sum(tf.cast(tf.add(pre, truth) >= 1, dtype=tf.float32), axis=axis) # OR
# old axis=[0,1,2,3]
# epsilon = 1e-5
# batch_iou = inse / (union + epsilon)
# new haodong
batch_iou = (inse + smooth) / (union + smooth)
iou = tf.reduce_mean(batch_iou, name='iou_coe')
return iou |
def cross_entropy_seq(logits, target_seqs, batch_size=None): # , batch_size=1, num_steps=None):
"""Returns the expression of cross-entropy of two sequences, implement
softmax internally. Normally be used for fixed length RNN outputs, see `PTB example <https://github.com/tensorlayer/tensorlayer/blob/master/example/tutorial_ptb_lstm_state_is_tuple.py>`__.
Parameters
----------
logits : Tensor
2D tensor with shape of `[batch_size * n_steps, n_classes]`.
target_seqs : Tensor
The target sequence, 2D tensor `[batch_size, n_steps]`, if the number of step is dynamic, please use ``tl.cost.cross_entropy_seq_with_mask`` instead.
batch_size : None or int.
Whether to divide the cost by batch size.
- If integer, the return cost will be divided by `batch_size`.
- If None (default), the return cost will not be divided by anything.
Examples
--------
>>> see `PTB example <https://github.com/tensorlayer/tensorlayer/blob/master/example/tutorial_ptb_lstm_state_is_tuple.py>`__.for more details
>>> input_data = tf.placeholder(tf.int32, [batch_size, n_steps])
>>> targets = tf.placeholder(tf.int32, [batch_size, n_steps])
>>> # build the network
>>> print(net.outputs)
(batch_size * n_steps, n_classes)
>>> cost = tl.cost.cross_entropy_seq(network.outputs, targets)
"""
sequence_loss_by_example_fn = tf.contrib.legacy_seq2seq.sequence_loss_by_example
loss = sequence_loss_by_example_fn(
[logits], [tf.reshape(target_seqs, [-1])], [tf.ones_like(tf.reshape(target_seqs, [-1]), dtype=tf.float32)]
)
# [tf.ones([batch_size * num_steps])])
cost = tf.reduce_sum(loss) # / batch_size
if batch_size is not None:
cost = cost / batch_size
return cost |
def cross_entropy_seq_with_mask(logits, target_seqs, input_mask, return_details=False, name=None):
"""Returns the expression of cross-entropy of two sequences, implement
softmax internally. Normally be used for Dynamic RNN with Synced sequence input and output.
Parameters
-----------
logits : Tensor
2D tensor with shape of [batch_size * ?, n_classes], `?` means dynamic IDs for each example.
- Can be get from `DynamicRNNLayer` by setting ``return_seq_2d`` to `True`.
target_seqs : Tensor
int of tensor, like word ID. [batch_size, ?], `?` means dynamic IDs for each example.
input_mask : Tensor
The mask to compute loss, it has the same size with `target_seqs`, normally 0 or 1.
return_details : boolean
Whether to return detailed losses.
- If False (default), only returns the loss.
- If True, returns the loss, losses, weights and targets (see source code).
Examples
--------
>>> batch_size = 64
>>> vocab_size = 10000
>>> embedding_size = 256
>>> input_seqs = tf.placeholder(dtype=tf.int64, shape=[batch_size, None], name="input")
>>> target_seqs = tf.placeholder(dtype=tf.int64, shape=[batch_size, None], name="target")
>>> input_mask = tf.placeholder(dtype=tf.int64, shape=[batch_size, None], name="mask")
>>> net = tl.layers.EmbeddingInputlayer(
... inputs = input_seqs,
... vocabulary_size = vocab_size,
... embedding_size = embedding_size,
... name = 'seq_embedding')
>>> net = tl.layers.DynamicRNNLayer(net,
... cell_fn = tf.contrib.rnn.BasicLSTMCell,
... n_hidden = embedding_size,
... dropout = (0.7 if is_train else None),
... sequence_length = tl.layers.retrieve_seq_length_op2(input_seqs),
... return_seq_2d = True,
... name = 'dynamicrnn')
>>> print(net.outputs)
(?, 256)
>>> net = tl.layers.DenseLayer(net, n_units=vocab_size, name="output")
>>> print(net.outputs)
(?, 10000)
>>> loss = tl.cost.cross_entropy_seq_with_mask(net.outputs, target_seqs, input_mask)
"""
targets = tf.reshape(target_seqs, [-1]) # to one vector
weights = tf.to_float(tf.reshape(input_mask, [-1])) # to one vector like targets
losses = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits, labels=targets, name=name) * weights
# losses = tf.reduce_mean(tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits, labels=targets, name=name)) # for TF1.0 and others
loss = tf.divide(
tf.reduce_sum(losses), # loss from mask. reduce_sum before element-wise mul with mask !!
tf.reduce_sum(weights),
name="seq_loss_with_mask"
)
if return_details:
return loss, losses, weights, targets
else:
return loss |
def cosine_similarity(v1, v2):
"""Cosine similarity [-1, 1].
Parameters
----------
v1, v2 : Tensor
Tensor with the same shape [batch_size, n_feature].
References
----------
- `Wiki <https://en.wikipedia.org/wiki/Cosine_similarity>`__.
"""
return tf.reduce_sum(tf.multiply(v1, v2), 1) / \
(tf.sqrt(tf.reduce_sum(tf.multiply(v1, v1), 1)) *
tf.sqrt(tf.reduce_sum(tf.multiply(v2, v2), 1))) |
def li_regularizer(scale, scope=None):
"""Li regularization removes the neurons of previous layer. The `i` represents `inputs`.
Returns a function that can be used to apply group li regularization to weights.
The implementation follows `TensorFlow contrib <https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/layers/python/layers/regularizers.py>`__.
Parameters
----------
scale : float
A scalar multiplier `Tensor`. 0.0 disables the regularizer.
scope: str
An optional scope name for this function.
Returns
--------
A function with signature `li(weights, name=None)` that apply Li regularization.
Raises
------
ValueError : if scale is outside of the range [0.0, 1.0] or if scale is not a float.
"""
if isinstance(scale, numbers.Integral):
raise ValueError('scale cannot be an integer: %s' % scale)
if isinstance(scale, numbers.Real):
if scale < 0.:
raise ValueError('Setting a scale less than 0 on a regularizer: %g' % scale)
if scale >= 1.:
raise ValueError('Setting a scale greater than 1 on a regularizer: %g' % scale)
if scale == 0.:
tl.logging.info('Scale of 0 disables regularizer.')
return lambda _, name=None: None
def li(weights):
"""Applies li regularization to weights."""
with tf.name_scope('li_regularizer') as scope:
my_scale = ops.convert_to_tensor(scale, dtype=weights.dtype.base_dtype, name='scale')
# if tf.__version__ <= '0.12':
# standard_ops_fn = standard_ops.mul
# else:
standard_ops_fn = standard_ops.multiply
return standard_ops_fn(
my_scale, standard_ops.reduce_sum(standard_ops.sqrt(standard_ops.reduce_sum(tf.square(weights), 1))),
name=scope
)
return li |
def maxnorm_regularizer(scale=1.0):
"""Max-norm regularization returns a function that can be used to apply max-norm regularization to weights.
More about max-norm, see `wiki-max norm <https://en.wikipedia.org/wiki/Matrix_norm#Max_norm>`_.
The implementation follows `TensorFlow contrib <https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/layers/python/layers/regularizers.py>`__.
Parameters
----------
scale : float
A scalar multiplier `Tensor`. 0.0 disables the regularizer.
Returns
---------
A function with signature `mn(weights, name=None)` that apply Lo regularization.
Raises
--------
ValueError : If scale is outside of the range [0.0, 1.0] or if scale is not a float.
"""
if isinstance(scale, numbers.Integral):
raise ValueError('scale cannot be an integer: %s' % scale)
if isinstance(scale, numbers.Real):
if scale < 0.:
raise ValueError('Setting a scale less than 0 on a regularizer: %g' % scale)
# if scale >= 1.:
# raise ValueError('Setting a scale greater than 1 on a regularizer: %g' %
# scale)
if scale == 0.:
tl.logging.info('Scale of 0 disables regularizer.')
return lambda _, name=None: None
def mn(weights, name='max_regularizer'):
"""Applies max-norm regularization to weights."""
with tf.name_scope(name) as scope:
my_scale = ops.convert_to_tensor(scale, dtype=weights.dtype.base_dtype, name='scale')
# if tf.__version__ <= '0.12':
# standard_ops_fn = standard_ops.mul
# else:
standard_ops_fn = standard_ops.multiply
return standard_ops_fn(my_scale, standard_ops.reduce_max(standard_ops.abs(weights)), name=scope)
return mn |
def maxnorm_o_regularizer(scale):
"""Max-norm output regularization removes the neurons of current layer.
Returns a function that can be used to apply max-norm regularization to each column of weight matrix.
The implementation follows `TensorFlow contrib <https://github.com/tensorflow/tensorflow/blob/master/tensorflow/contrib/layers/python/layers/regularizers.py>`__.
Parameters
----------
scale : float
A scalar multiplier `Tensor`. 0.0 disables the regularizer.
Returns
---------
A function with signature `mn_o(weights, name=None)` that apply Lo regularization.
Raises
---------
ValueError : If scale is outside of the range [0.0, 1.0] or if scale is not a float.
"""
if isinstance(scale, numbers.Integral):
raise ValueError('scale cannot be an integer: %s' % scale)
if isinstance(scale, numbers.Real):
if scale < 0.:
raise ValueError('Setting a scale less than 0 on a regularizer: %g' % scale)
# if scale >= 1.:
# raise ValueError('Setting a scale greater than 1 on a regularizer: %g' %
# scale)
if scale == 0.:
tl.logging.info('Scale of 0 disables regularizer.')
return lambda _, name=None: None
def mn_o(weights, name='maxnorm_o_regularizer'):
"""Applies max-norm regularization to weights."""
with tf.name_scope(name) as scope:
my_scale = ops.convert_to_tensor(scale, dtype=weights.dtype.base_dtype, name='scale')
if tf.__version__ <= '0.12':
standard_ops_fn = standard_ops.mul
else:
standard_ops_fn = standard_ops.multiply
return standard_ops_fn(
my_scale, standard_ops.reduce_sum(standard_ops.reduce_max(standard_ops.abs(weights), 0)), name=scope
)
return mn_o |
def ramp(x, v_min=0, v_max=1, name=None):
"""Ramp activation function.
Parameters
----------
x : Tensor
input.
v_min : float
cap input to v_min as a lower bound.
v_max : float
cap input to v_max as a upper bound.
name : str
The function name (optional).
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
"""
return tf.clip_by_value(x, clip_value_min=v_min, clip_value_max=v_max, name=name) |
def leaky_relu(x, alpha=0.2, name="leaky_relu"):
"""leaky_relu can be used through its shortcut: :func:`tl.act.lrelu`.
This function is a modified version of ReLU, introducing a nonzero gradient for negative input. Introduced by the paper:
`Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
The function return the following results:
- When x < 0: ``f(x) = alpha_low * x``.
- When x >= 0: ``f(x) = x``.
Parameters
----------
x : Tensor
Support input type ``float``, ``double``, ``int32``, ``int64``, ``uint8``, ``int16``, or ``int8``.
alpha : float
Slope.
name : str
The function name (optional).
Examples
--------
>>> import tensorlayer as tl
>>> net = tl.layers.DenseLayer(net, 100, act=lambda x : tl.act.lrelu(x, 0.2), name='dense')
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
References
----------
- `Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
"""
if not (0 < alpha <= 1):
raise ValueError("`alpha` value must be in [0, 1]`")
with tf.name_scope(name, "leaky_relu") as name_scope:
x = tf.convert_to_tensor(x, name="features")
return tf.maximum(x, alpha * x, name=name_scope) |
def leaky_relu6(x, alpha=0.2, name="leaky_relu6"):
""":func:`leaky_relu6` can be used through its shortcut: :func:`tl.act.lrelu6`.
This activation function is a modified version :func:`leaky_relu` introduced by the following paper:
`Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
This activation function also follows the behaviour of the activation function :func:`tf.nn.relu6` introduced by the following paper:
`Convolutional Deep Belief Networks on CIFAR-10 [A. Krizhevsky, 2010] <http://www.cs.utoronto.ca/~kriz/conv-cifar10-aug2010.pdf>`__
The function return the following results:
- When x < 0: ``f(x) = alpha_low * x``.
- When x in [0, 6]: ``f(x) = x``.
- When x > 6: ``f(x) = 6``.
Parameters
----------
x : Tensor
Support input type ``float``, ``double``, ``int32``, ``int64``, ``uint8``, ``int16``, or ``int8``.
alpha : float
Slope.
name : str
The function name (optional).
Examples
--------
>>> import tensorlayer as tl
>>> net = tl.layers.DenseLayer(net, 100, act=lambda x : tl.act.leaky_relu6(x, 0.2), name='dense')
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
References
----------
- `Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
- `Convolutional Deep Belief Networks on CIFAR-10 [A. Krizhevsky, 2010] <http://www.cs.utoronto.ca/~kriz/conv-cifar10-aug2010.pdf>`__
"""
if not isinstance(alpha, tf.Tensor) and not (0 < alpha <= 1):
raise ValueError("`alpha` value must be in [0, 1]`")
with tf.name_scope(name, "leaky_relu6") as name_scope:
x = tf.convert_to_tensor(x, name="features")
return tf.minimum(tf.maximum(x, alpha * x), 6, name=name_scope) |
def leaky_twice_relu6(x, alpha_low=0.2, alpha_high=0.2, name="leaky_relu6"):
""":func:`leaky_twice_relu6` can be used through its shortcut: :func:`:func:`tl.act.ltrelu6`.
This activation function is a modified version :func:`leaky_relu` introduced by the following paper:
`Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
This activation function also follows the behaviour of the activation function :func:`tf.nn.relu6` introduced by the following paper:
`Convolutional Deep Belief Networks on CIFAR-10 [A. Krizhevsky, 2010] <http://www.cs.utoronto.ca/~kriz/conv-cifar10-aug2010.pdf>`__
This function push further the logic by adding `leaky` behaviour both below zero and above six.
The function return the following results:
- When x < 0: ``f(x) = alpha_low * x``.
- When x in [0, 6]: ``f(x) = x``.
- When x > 6: ``f(x) = 6 + (alpha_high * (x-6))``.
Parameters
----------
x : Tensor
Support input type ``float``, ``double``, ``int32``, ``int64``, ``uint8``, ``int16``, or ``int8``.
alpha_low : float
Slope for x < 0: ``f(x) = alpha_low * x``.
alpha_high : float
Slope for x < 6: ``f(x) = 6 (alpha_high * (x-6))``.
name : str
The function name (optional).
Examples
--------
>>> import tensorlayer as tl
>>> net = tl.layers.DenseLayer(net, 100, act=lambda x : tl.act.leaky_twice_relu6(x, 0.2, 0.2), name='dense')
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
References
----------
- `Rectifier Nonlinearities Improve Neural Network Acoustic Models [A. L. Maas et al., 2013] <https://ai.stanford.edu/~amaas/papers/relu_hybrid_icml2013_final.pdf>`__
- `Convolutional Deep Belief Networks on CIFAR-10 [A. Krizhevsky, 2010] <http://www.cs.utoronto.ca/~kriz/conv-cifar10-aug2010.pdf>`__
"""
if not isinstance(alpha_high, tf.Tensor) and not (0 < alpha_high <= 1):
raise ValueError("`alpha_high` value must be in [0, 1]`")
if not isinstance(alpha_low, tf.Tensor) and not (0 < alpha_low <= 1):
raise ValueError("`alpha_low` value must be in [0, 1]`")
with tf.name_scope(name, "leaky_twice_relu6") as name_scope:
x = tf.convert_to_tensor(x, name="features")
x_is_above_0 = tf.minimum(x, 6 * (1 - alpha_high) + alpha_high * x)
x_is_below_0 = tf.minimum(alpha_low * x, 0)
return tf.maximum(x_is_above_0, x_is_below_0, name=name_scope) |
def swish(x, name='swish'):
"""Swish function.
See `Swish: a Self-Gated Activation Function <https://arxiv.org/abs/1710.05941>`__.
Parameters
----------
x : Tensor
input.
name: str
function name (optional).
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
"""
with tf.name_scope(name):
x = tf.nn.sigmoid(x) * x
return x |
def pixel_wise_softmax(x, name='pixel_wise_softmax'):
"""Return the softmax outputs of images, every pixels have multiple label, the sum of a pixel is 1.
Usually be used for image segmentation.
Parameters
----------
x : Tensor
input.
- For 2d image, 4D tensor (batch_size, height, weight, channel), where channel >= 2.
- For 3d image, 5D tensor (batch_size, depth, height, weight, channel), where channel >= 2.
name : str
function name (optional)
Returns
-------
Tensor
A ``Tensor`` in the same type as ``x``.
Examples
--------
>>> outputs = pixel_wise_softmax(network.outputs)
>>> dice_loss = 1 - dice_coe(outputs, y_, epsilon=1e-5)
References
----------
- `tf.reverse <https://www.tensorflow.org/versions/master/api_docs/python/array_ops.html#reverse>`__
"""
with tf.name_scope(name):
return tf.nn.softmax(x) |
def _conv_linear(args, filter_size, num_features, bias, bias_start=0.0, scope=None):
"""convolution:
Parameters
----------
args : tensor
4D Tensor or a list of 4D, batch x n, Tensors.
filter_size : tuple of int
Filter height and width.
num_features : int
Nnumber of features.
bias_start : float
Starting value to initialize the bias; 0 by default.
scope : VariableScope
For the created subgraph; defaults to "Linear".
Returns
--------
- A 4D Tensor with shape [batch h w num_features]
Raises
-------
- ValueError : if some of the arguments has unspecified or wrong shape.
"""
# Calculate the total size of arguments on dimension 1.
total_arg_size_depth = 0
shapes = [a.get_shape().as_list() for a in args]
for shape in shapes:
if len(shape) != 4:
raise ValueError("Linear is expecting 4D arguments: %s" % str(shapes))
if not shape[3]:
raise ValueError("Linear expects shape[4] of arguments: %s" % str(shapes))
else:
total_arg_size_depth += shape[3]
dtype = [a.dtype for a in args][0]
# Now the computation.
with tf.variable_scope(scope or "Conv"):
matrix = tf.get_variable(
"Matrix", [filter_size[0], filter_size[1], total_arg_size_depth, num_features], dtype=dtype
)
if len(args) == 1:
res = tf.nn.conv2d(args[0], matrix, strides=[1, 1, 1, 1], padding='SAME')
else:
res = tf.nn.conv2d(tf.concat(args, 3), matrix, strides=[1, 1, 1, 1], padding='SAME')
if not bias:
return res
bias_term = tf.get_variable(
"Bias", [num_features], dtype=dtype, initializer=tf.constant_initializer(bias_start, dtype=dtype)
)
return res + bias_term |
def advanced_indexing_op(inputs, index):
"""Advanced Indexing for Sequences, returns the outputs by given sequence lengths.
When return the last output :class:`DynamicRNNLayer` uses it to get the last outputs with the sequence lengths.
Parameters
-----------
inputs : tensor for data
With shape of [batch_size, n_step(max), n_features]
index : tensor for indexing
Sequence length in Dynamic RNN. [batch_size]
Examples
---------
>>> import numpy as np
>>> import tensorflow as tf
>>> import tensorlayer as tl
>>> batch_size, max_length, n_features = 3, 5, 2
>>> z = np.random.uniform(low=-1, high=1, size=[batch_size, max_length, n_features]).astype(np.float32)
>>> b_z = tf.constant(z)
>>> sl = tf.placeholder(dtype=tf.int32, shape=[batch_size])
>>> o = advanced_indexing_op(b_z, sl)
>>>
>>> sess = tf.InteractiveSession()
>>> tl.layers.initialize_global_variables(sess)
>>>
>>> order = np.asarray([1,1,2])
>>> print("real",z[0][order[0]-1], z[1][order[1]-1], z[2][order[2]-1])
>>> y = sess.run([o], feed_dict={sl:order})
>>> print("given",order)
>>> print("out", y)
real [-0.93021595 0.53820813] [-0.92548317 -0.77135968] [ 0.89952248 0.19149846]
given [1 1 2]
out [array([[-0.93021595, 0.53820813],
[-0.92548317, -0.77135968],
[ 0.89952248, 0.19149846]], dtype=float32)]
References
-----------
- Modified from TFlearn (the original code is used for fixed length rnn), `references <https://github.com/tflearn/tflearn/blob/master/tflearn/layers/recurrent.py>`__.
"""
batch_size = tf.shape(inputs)[0]
# max_length = int(inputs.get_shape()[1]) # for fixed length rnn, length is given
max_length = tf.shape(inputs)[1] # for dynamic_rnn, length is unknown
dim_size = int(inputs.get_shape()[2])
index = tf.range(0, batch_size) * max_length + (index - 1)
flat = tf.reshape(inputs, [-1, dim_size])
relevant = tf.gather(flat, index)
return relevant |
def retrieve_seq_length_op(data):
"""An op to compute the length of a sequence from input shape of [batch_size, n_step(max), n_features],
it can be used when the features of padding (on right hand side) are all zeros.
Parameters
-----------
data : tensor
[batch_size, n_step(max), n_features] with zero padding on right hand side.
Examples
---------
>>> data = [[[1],[2],[0],[0],[0]],
... [[1],[2],[3],[0],[0]],
... [[1],[2],[6],[1],[0]]]
>>> data = np.asarray(data)
>>> print(data.shape)
(3, 5, 1)
>>> data = tf.constant(data)
>>> sl = retrieve_seq_length_op(data)
>>> sess = tf.InteractiveSession()
>>> tl.layers.initialize_global_variables(sess)
>>> y = sl.eval()
[2 3 4]
Multiple features
>>> data = [[[1,2],[2,2],[1,2],[1,2],[0,0]],
... [[2,3],[2,4],[3,2],[0,0],[0,0]],
... [[3,3],[2,2],[5,3],[1,2],[0,0]]]
>>> print(sl)
[4 3 4]
References
------------
Borrow from `TFlearn <https://github.com/tflearn/tflearn/blob/master/tflearn/layers/recurrent.py>`__.
"""
with tf.name_scope('GetLength'):
used = tf.sign(tf.reduce_max(tf.abs(data), 2))
length = tf.reduce_sum(used, 1)
return tf.cast(length, tf.int32) |
def retrieve_seq_length_op2(data):
"""An op to compute the length of a sequence, from input shape of [batch_size, n_step(max)],
it can be used when the features of padding (on right hand side) are all zeros.
Parameters
-----------
data : tensor
[batch_size, n_step(max)] with zero padding on right hand side.
Examples
--------
>>> data = [[1,2,0,0,0],
... [1,2,3,0,0],
... [1,2,6,1,0]]
>>> o = retrieve_seq_length_op2(data)
>>> sess = tf.InteractiveSession()
>>> tl.layers.initialize_global_variables(sess)
>>> print(o.eval())
[2 3 4]
"""
return tf.reduce_sum(tf.cast(tf.greater(data, tf.zeros_like(data)), tf.int32), 1) |
def retrieve_seq_length_op3(data, pad_val=0): # HangSheng: return tensor for sequence length, if input is tf.string
"""Return tensor for sequence length, if input is ``tf.string``."""
data_shape_size = data.get_shape().ndims
if data_shape_size == 3:
return tf.reduce_sum(tf.cast(tf.reduce_any(tf.not_equal(data, pad_val), axis=2), dtype=tf.int32), 1)
elif data_shape_size == 2:
return tf.reduce_sum(tf.cast(tf.not_equal(data, pad_val), dtype=tf.int32), 1)
elif data_shape_size == 1:
raise ValueError("retrieve_seq_length_op3: data has wrong shape!")
else:
raise ValueError(
"retrieve_seq_length_op3: handling data_shape_size %s hasn't been implemented!" % (data_shape_size)
) |
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