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  1. .gitattributes +408 -0
  2. README.md +825 -0
  3. croissant.json +3 -0
  4. darcy-flow-241/out_of_distribution_extreme/darcy_flow_1006.h5 +3 -0
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README.md ADDED
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1
+ # PDEInvBench Data Guide
2
+ Data guide for the dataset accompanying PDEInvBench.
3
+ <img src="images/pde_objectives_main_fig_1.png" alt="" width="400">
4
+
5
+ ## Table of Contents
6
+
7
+ 1. [Dataset Link](#1-dataset-link)
8
+ 2. [Downloading Data](#2-downloading-data)
9
+ 3. [Overview](#3-overview)
10
+ - [3.1 Data Format](#31-data-format)
11
+ - [3.2 Parameter Extraction from Filenames](#32-parameter-extraction-from-filenames)
12
+ - [3.3 Working with High-Resolution Data](#33-working-with-high-resolution-data)
13
+ - [3.4 Data Loading Parameters](#34-data-loading-parameters)
14
+ - [3.5 Parameter Normalization](#35-parameter-normalization)
15
+ 4. [Datasets](#4-datasets)
16
+ - [4a. 2D Reaction Diffusion](#4a-2d-reaction-diffusion)
17
+ - [4b. 2D Navier Stokes (Unforced)](#4b-2d-navier-stokes-unforced)
18
+ - [4c. 2D Turbulent Flow (Forced Navier Stokes)](#4c-2d-turbulent-flow-forced-navier-stokes)
19
+ - [4d. 1D Korteweg-De Vries](#4d-1d-korteweg-de-vries)
20
+ - [4e. 2D Darcy Flow](#4e-2d-darcy-flow)
21
+ 5. [Adding a New Dataset](#5-adding-a-new-dataset)
22
+
23
+
24
+ ## 1. Dataset Link
25
+
26
+ The dataset used in this project can be found here:
27
+ https://huggingface.co/datasets/DabbyOWL/PDE_Inverse_Problem_Benchmarking/tree/main
28
+
29
+ ## 2. Downloading Data
30
+
31
+ We provide a python script: [`huggingface_pdeinv_download.py`](huggingface_pdeinv_download.py) to batch download our hugging-face data. We will update the readme of our hugging-face dataset and our github repo to reflect this addition. To run this:
32
+
33
+ ```bash
34
+ pip install huggingface_hub
35
+ python3 huggingface_pdeinv_download.py [--dataset DATASET_NAME] [--split SPLIT] [--local-dir PATH]
36
+ ```
37
+
38
+ **Available datasets:** `darcy-flow-241`, `darcy-flow-421`, `korteweg-de-vries-1d`, `navier-stokes-forced-2d-2048`, `navier-stokes-forced-2d`, `navier-stokes-unforced-2d`, `reaction-diffusion-2d-du-512`, `reaction-diffusion-2d-du`, `reaction-diffusion-2d-k-512`, `reaction-diffusion-2d-k`
39
+
40
+ **Available splits:** `*` (all), `train`, `validation`, `test`, `out_of_distribution`, `out_of_distribution_extreme`
41
+
42
+
43
+ ## 3. Overview
44
+
45
+ The PDEInvBench dataset contains five PDE systems spanning parabolic, hyperbolic, and elliptic classifications, designed for benchmarking inverse parameter estimation.
46
+
47
+ ### Dataset Scale and Scope
48
+
49
+ The dataset encompasses **over 1.2 million individual simulations** across five PDE systems, with varying spatial and temporal resolutions:
50
+
51
+ - **2D Reaction Diffusion**: 28×28×27 = 21,168 parameter combinations × 5 trajectories = 105,840 simulations
52
+ - **2D Navier Stokes**: 101 parameter values × 192 trajectories = 19,392 simulations
53
+ - **2D Turbulent Flow**: 120 parameter values × 108 trajectories = 12,960 simulations
54
+ - **1D Korteweg-De Vries**: 100 parameter values × 100 trajectories = 10,000 simulations
55
+ - **2D Darcy Flow**: 2,048 unique coefficient fields
56
+
57
+ ### Multi-Resolution Architecture
58
+
59
+ The dataset provides multiple spatial resolutions for each system, enabling studies on resolution-dependent generalization:
60
+
61
+ - **Low Resolution**: 64×64 (2D systems), 256 (1D KdV), 241×241 (Darcy Flow)
62
+ - **Medium Resolution**: 128×128 (2D systems), 256×256 (Turbulent Flow)
63
+ - **High Resolution**: 256×256, 512×512, 2048x2048 (2D systems), 421×421 (Darcy Flow)
64
+
65
+ ### Physical and Mathematical Diversity
66
+
67
+ **Parabolic Systems** (Time-dependent, diffusive):
68
+ - **2D Reaction Diffusion**: Chemical pattern formation with Fitzhugh-Nagumo dynamics
69
+ - **2D Navier Stokes**: Fluid flow without external forcing
70
+ - **2D Turbulent Flow**: Forced fluid dynamics with Kolmogorov forcing
71
+
72
+ **Hyperbolic Systems** (Wave propagation):
73
+ - **1D Korteweg-De Vries**: Soliton dynamics in shallow water waves
74
+
75
+ **Elliptic Systems** (Steady-state):
76
+ - **2D Darcy Flow**: Groundwater flow through porous media
77
+
78
+ ### Parameter Space Coverage
79
+
80
+ The dataset systematically explores parameter spaces across different physical regimes:
81
+
82
+ - **Reaction Diffusion**: k ∈ [0.005,0.1], Du ∈ [0.01,0.5], Dv ∈ [0.01,0.5] (Turing bifurcations)
83
+ - **Navier Stokes**: ν ∈ [10⁻⁴,10⁻²] (Reynolds: 80-8000, laminar to transitional)
84
+ - **Turbulent Flow**: ν ∈ [10⁻⁵,10⁻²] (fully developed turbulence)
85
+ - **Korteweg-De Vries**: δ ∈ [0.8,5] (dispersion strength in shallow water)
86
+ - **Darcy Flow**: Piecewise constant diffusion coefficients (porous media heterogeneity)
87
+
88
+ ### Evaluation Framework
89
+
90
+ The dataset implements a sophisticated three-tier evaluation system for comprehensive generalization testing:
91
+
92
+ 1. **In-Distribution (ID)**: Parameters within training ranges for baseline performance
93
+ 2. **Out-of-Distribution (Non-Extreme)**: Middle-range parameters excluded from training
94
+ 3. **Out-of-Distribution (Extreme)**: Extremal parameter values for stress testing
95
+
96
+ This framework enables systematic evaluation of model robustness across parameter space, critical for real-world deployment where models must generalize beyond training distributions.
97
+
98
+
99
+ ### Data Organization and Accessibility
100
+
101
+ The dataset is organized in a standardized HDF5 format with:
102
+
103
+ - **Hierarchical Structure**: Train/validation/test splits with consistent naming conventions
104
+ - **Parameter Encoding**: Filenames encode parameter values for easy parsing
105
+ - **Multi-Channel Support**: 2D systems support multiple solution channels (velocity components, chemical species)
106
+ - **Grid Information**: Complete spatial and temporal coordinate information
107
+ - **Normalization Statistics**: Pre-computed parameter normalization for consistent preprocessing
108
+
109
+ ### Key Features for Inverse Problem Benchmarking
110
+
111
+ 1. **Multi-Physics Coverage**: Spans chemical, fluid, wave, and porous media physics
112
+ 2. **Resolution Scalability**: Enables studies on resolution-dependent model behavior
113
+ 3. **Parameter Diversity**: Systematic exploration of parameter spaces across physical regimes
114
+ 4. **Generalization Testing**: Built-in evaluation framework for out-of-distribution performance
115
+ 5. **Computational Efficiency**: Optimized data loading and preprocessing pipelines
116
+ 6. **Reproducibility**: Complete documentation of generation parameters and solver configurations
117
+
118
+ This comprehensive dataset provides researchers with a unified platform for developing and evaluating inverse problem solving methods across diverse scientific domains, enabling systematic comparison of approaches and identification of fundamental limitations in current methodologies.
119
+
120
+ ### 3.1 Data Format
121
+
122
+ All datasets are stored in HDF5 format with specific structure depending on the PDE system.
123
+
124
+ #### Directory Structure
125
+
126
+ Datasets should be organized in the following directory structure:
127
+
128
+ ```
129
+ /path/to/data/
130
+ ├── train/
131
+ │ ├── param_file_1.h5
132
+ │ ├── param_file_2.h5
133
+ │ └── ...
134
+ ├── validation/
135
+ │ ├── param_file_3.h5
136
+ │ └── ...
137
+ └── test/
138
+ ├── param_file_4.h5
139
+ └── ...
140
+ ```
141
+
142
+ ### 3.2 Parameter Extraction from Filenames
143
+
144
+ Parameters are extracted from filenames using pattern matching. For example:
145
+
146
+ - **2D Reaction Diffusion**: `Du=0.1_Dv=0.2_k=0.05.h5`
147
+ - Du = 0.1, Dv = 0.2, k = 0.05
148
+
149
+ - **2D Navier Stokes**: `83.0.h5`
150
+ - Reynolds number = 83.0
151
+
152
+ - **1D KdV**: `delta=3.5_ic=42.h5`
153
+ - δ = 3.5
154
+
155
+ ### 3.3 Working with High-Resolution Data
156
+
157
+ For high-resolution datasets, we provide configurations for downsampling:
158
+
159
+ | PDE System | Original Resolution | High-Resolution |
160
+ |------------|:-------------------:|:---------------:|
161
+ | 2D Reaction Diffusion | 128×128 | 512×512 |
162
+ | 2D Navier Stokes | 64×64 | 256×256 |
163
+ | 2D Turbulent Flow | 64x64 | 2048x2048 |
164
+ | Darcy Flow | 241×241 | 421×421 |
165
+
166
+ When working with high-resolution data, set the following parameters:
167
+
168
+ ```bash
169
+ high_resolution=True
170
+ data.downsample_factor=4 # e.g., for 512×512 → 128×128
171
+ data.batch_size=2 # Reduce batch size for GPU memory
172
+ ```
173
+
174
+ ### 3.4 Data Loading Parameters
175
+
176
+ Key parameters for loading data:
177
+
178
+ - `data.every_nth_window`: Controls sampling frequency of time windows
179
+ - `data.frac_ics_per_param`: Fraction of initial conditions per parameter to use
180
+ - `data.frac_param_combinations`: Fraction of parameter combinations to use
181
+ - `data.train_window_end_percent`: Percentage of trajectory used for training
182
+ - `data.test_window_start_percent`: Percentage where test window starts
183
+
184
+ ### 3.5 Parameter Normalization
185
+
186
+ Parameters are normalized using the following statistics, where the mean and standard deviation are computed using the span of the parameters in the dataset:
187
+
188
+ ```python
189
+ PARAM_NORMALIZATION_STATS = {
190
+ PDE.ReactionDiffusion2D: {
191
+ "k": (0.06391126306498819, 0.029533048151465856), # (mean, std)
192
+ "Du": (0.3094992685910578, 0.13865605073673604), # (mean, std)
193
+ "Dv": (0.259514500345804, 0.11541850276902947), # (mean, std)
194
+ },
195
+ PDE.NavierStokes2D: {"re": (1723.425, 1723.425)}, # (mean, std)
196
+ PDE.TurbulentFlow2D: {"nu": (0.001372469573118451, 0.002146258280849241)},
197
+ PDE.KortewegDeVries1D: {"delta": (2.899999997019768, 1.2246211546444339)},
198
+ # Add more as needed
199
+ }
200
+ ```
201
+
202
+ ## 4. Datasets
203
+
204
+ This section provides detailed information about each PDE system in the dataset. Each subsection includes visualizations, descriptions, and technical specifications.
205
+
206
+ ### 4a. 2D Reaction Diffusion
207
+
208
+ <img src="images/2drd_u_channel.png" alt="2DRD-Activator" width="400">
209
+ <img src="images/2drd_v_channel.png" alt="2DRD-Inhibitor" width="400">
210
+
211
+ **Description:** The 2D Reaction-Diffusion system models chemical reactions with spatial diffusion using the Fitzhugh-Nagumo equations. This dataset contains two-channel solutions (activator u and inhibitor v) with parameters k (threshold for excitement), Du (activator diffusivity), and Dv (inhibitor diffusivity). The system exhibits complex pattern formation including spots, stripes, and labyrinthine structures, spanning from dissipative to Turing bifurcations.
212
+
213
+ **Mathematical Formulation:**
214
+ The activator u and inhibitor v coupled system follows:
215
+
216
+ ```
217
+ ∂tu = Du∂xxu + Du∂yyu + Ru
218
+ ∂tv = Dv∂xxv + Dv∂yyv + Rv
219
+ ```
220
+
221
+ where Ru and Rv are defined by the Fitzhugh-Nagumo equations:
222
+
223
+ ```
224
+ Ru(u,v) = u - u³ - k - v
225
+ Rv(u,v) = u - v
226
+ ```
227
+
228
+ **Parameters of Interest:**
229
+ - **Du**: Activator diffusion coefficient
230
+ - **Dv**: Inhibitor diffusion coefficient
231
+ - **k**: Threshold for excitement
232
+
233
+ **Data Characteristics:**
234
+ - Partial Derivatives: 5
235
+ - Time-dependent: Yes (parabolic)
236
+ - Spatial Resolutions: 128×128, 512x512
237
+ - Parameters: k ∈ [0.005,0.1], Du ∈ [0.01,0.5], Dv ∈ [0.01,0.5]
238
+ - Temporal Resolution: 0.049/5 seconds
239
+ - Parameter Values: k - 28, Du - 28, Dv - 27
240
+ - Initial Conditions/Trajectories: 5
241
+
242
+ **Evaluation Splits:**
243
+ - **Test (ID)**: k ∈ [0.01,0.04] ∪ [0.08,0.09], Du ∈ [0.08,0.2] ∪ [0.4,0.49], Dv ∈ [0.08,0.2] ∪ [0.4,0.49]
244
+ - **OOD (Non-Extreme)**: k ∈ [0.04,0.08], Du ∈ [0.2,0.4], Dv ∈ [0.2,0.4]
245
+ - **OOD (Extreme)**: k ∈ [0.001,0.01] ∪ [0.09,0.1], Du ∈ [0.02,0.08] ∪ [0.49,0.5], Dv ∈ [0.02,0.08] ∪ [0.49,0.5]
246
+
247
+ **Generation Parameters:**
248
+ - **Solver**: Explicit Runge-Kutta method of order 5(4) (RK45)
249
+ - **Error Tolerance**: Relative error tolerance of 10⁻⁶
250
+ - **Spatial Discretization**: Finite Volume Method (FVM) with uniform 128×128 grid
251
+ - **Domain**: [-1,1] × [-1,1] with cell size Δx = Δy = 0.015625
252
+ - **Burn-in Period**: 1 simulation second
253
+ - **Dataset Simulation Time**: [0,5] seconds, 101 time steps
254
+ - **Nominal Time Step**: Δt ≈ 0.05 seconds (adaptive)
255
+ - **Generation Time**: ≈ 1 week on CPU
256
+
257
+ **File Structure:**
258
+ ```
259
+ filename: Du=0.1_Dv=0.2_k=0.05.h5
260
+ ```
261
+ Contents:
262
+ - `0001/data`: Solution field [time, spatial_dim_1, spatial_dim_2, channels]
263
+ - `0001/grid/x`: x-coordinate grid points
264
+ - `0001/grid/y`: y-coordinate grid points
265
+ - `0001/grid/t`: Time points
266
+
267
+ ### 4b. 2D Navier Stokes (Unforced)
268
+
269
+ <img src="images/2dns.png" alt="2DNS" width="400">
270
+
271
+ **Description:** The 2D Navier-Stokes equations describe incompressible fluid flow without external forcing. This dataset contains velocity field solutions with varying Reynolds numbers, showcasing different flow regimes from laminar to transitional flows.
272
+
273
+ **Mathematical Formulation:**
274
+ We consider the vorticity form of the unforced Navier-Stokes equations:
275
+
276
+ ```
277
+ ∂w(t,x,y)/∂t + u(t,x,y)·∇w(t,x,y) = νΔw(t,x,y)
278
+ ```
279
+
280
+ for t ∈ [0,T] and (x,y) ∈ (0,1)², with auxiliary conditions:
281
+ - w = ∇ × u
282
+ - ∇ · u = 0
283
+ - w(0,x,y) = w₀(x,y) (Boundary Conditions)
284
+
285
+ **Parameters of Interest:**
286
+ - **ν**: The physical parameter of interest, representing viscosity
287
+
288
+ **Data Characteristics:**
289
+ - Partial Derivatives: 3
290
+ - Time-dependent: Yes (parabolic)
291
+ - Spatial Resolutions: 64×64, 256x256
292
+ - Parameters: ν ∈ [10⁻⁴,10⁻²] (Reynolds: 80-8000)
293
+ - Temporal Resolution: 0.0468/3 seconds
294
+ - Parameter Values: 101
295
+ - Initial Conditions/Trajectories: 192
296
+
297
+ The files contain spatial resolutions at 256x256, which are later downsampled using scipy decimate to 64x64
298
+
299
+
300
+ **Evaluation Splits:**
301
+ - **Test (ID)**: ν ∈ [10⁻³·⁸, 10⁻³·²] ∪ [10⁻²·⁸, 10⁻²·²]
302
+ - **OOD (Non-Extreme)**: ν ∈ [10⁻³·², 10⁻²·⁸]
303
+ - **OOD (Extreme)**: ν ∈ [10⁻⁴, 10⁻³·⁸] ∪ [10⁻²·², 10⁻²]
304
+
305
+ **Generation Parameters:**
306
+ - **Solver**: Pseudo-spectral solver with Crank-Nicolson time-stepping
307
+ - **Implementation**: Written in Jax and GPU-accelerated
308
+ - **Generation Time**: ≈ 3.5 GPU days (batch size=32)
309
+ - **Burn-in Period**: 15 simulation seconds
310
+ - **Saved Data**: Next 3 simulation seconds saved as dataset
311
+ - **Initial Conditions**: Sampled according to Gaussian random field (length scale=0.8)
312
+ - **Recording**: Solution recorded every 1 simulation second
313
+ - **Simulation dt**: 1e-4
314
+ - **Resolution**: 256×256
315
+
316
+ **File Structure:**
317
+ ```
318
+ filename: 83.0.h5
319
+ ```
320
+ Contents:
321
+ - `0001/data`: Solution field [time, spatial_dim_1, spatial_dim_2, channels]
322
+ - `0001/grid/x`: x-coordinate grid points
323
+ - `0001/grid/y`: y-coordinate grid points
324
+ - `0001/grid/t`: Time points
325
+
326
+ ### 4c. 2D Turbulent Flow (Forced Navier Stokes)
327
+
328
+ <img src="images/2dtf.png" alt="2DTF" width="400">
329
+
330
+ **Description:** The 2D Turbulent Flow dataset represents forced Navier-Stokes equations that generate fully developed turbulent flows. This dataset is particularly valuable for studying complex, multi-scale fluid dynamics and turbulent phenomena. All solutions exhibit turbulence across various Reynolds numbers.
331
+
332
+ **Mathematical Formulation:**
333
+ The forced Navier-Stokes equations with the Kolmogorov forcing function are similar to the unforced case with an additional forcing term:
334
+
335
+ ```
336
+ ∂ₜw + u·∇w = νΔw + f(k,y) - αw
337
+ ```
338
+
339
+ where the forcing function f(k,y) is defined as:
340
+ ```
341
+ f(k,y) = -kcos(ky)
342
+ ```
343
+
344
+ **Parameters of Interest:**
345
+ - **ν**: Kinematic viscosity (similar to unforced NS)
346
+ - **α**: Drag coefficient (fixed at α = 0.1)
347
+ - **k**: Forced wavenumber (fixed at k = 2)
348
+
349
+ The drag coefficient α primarily serves to keep the total energy of the system constant, acting as drag. The task is to predict ν.
350
+
351
+ **Numerical Convergence**
352
+ We examine convergence across all solutions we generated. However, at the spatial and temporal resolution used to produce this dataset, simulations with kinematic viscosity ν < 5e-4 may not be fully converged due to the fine scale turbulence dynamics. We include all generated trajectories in the training set to maximize coverage of the parameter space and to expose models to a broader range of flow regimes. Nevertheless, we recommend restricting quantitative evaluation and model selection to runs with ν >= 5e-4. For more details, please see our paper.
353
+
354
+ **Data Characteristics:**
355
+ - Partial Derivatives: 3
356
+ - Time-dependent: Yes (parabolic)
357
+ - Spatial Resolutions: 64x64, 2048x2048
358
+ - Parameters: ν ∈ [10⁻⁵,10⁻²]
359
+ - Temporal Resolution: 0.23/14.75 seconds
360
+ - Parameter Values: 120
361
+ - Initial Conditions/Trajectories: 108
362
+
363
+ **Evaluation Splits:**
364
+ - **Test (ID)**: ν ∈ [10⁻⁴·⁷, 10⁻³·⁸] ∪ [10⁻³·², 10⁻²·³]
365
+ - **OOD (Non-Extreme)**: ν ∈ [10⁻³·⁸, 10⁻³·²]
366
+ - **OOD (Extreme)**: ν ∈ [10⁻⁵, 10⁻⁴·⁷] ∪ [10⁻²·³, 10⁻²]
367
+
368
+ **Generation Parameters:**
369
+ - **Solver**: Pseudo-spectral solver with Crank-Nicolson time-stepping
370
+ - **Implementation**: Written in Jax (leveraging Jax-CFD), similar to 2D NS
371
+ - **Generation Time**: ≈ 4 GPU days (A100)
372
+ - **Burn-in Period**: 40 simulation seconds
373
+ - **Saved Data**: Next 15 simulation seconds saved as dataset
374
+ - **Simulator Resolution**: 256×256
375
+ - **Downsampling**: Downsamples to 64×64 before saving
376
+ - **Temporal Resolution (Saved)**: ∂t = 0.25 simulation seconds
377
+
378
+ **File Structure:**
379
+ ```
380
+ filename: nu=0.001.h5
381
+ ```
382
+ Contents:
383
+ - `0001/data`: Solution field [time, spatial_dim_1, spatial_dim_2, channels]
384
+ - `0001/grid/x`: x-coordinate grid points
385
+ - `0001/grid/y`: y-coordinate grid points
386
+ - `0001/grid/t`: Time points
387
+
388
+ ### 4d. 1D Korteweg-De Vries
389
+
390
+ <img src="images/1dkdv.png" alt="KdV" width="400">
391
+
392
+ **Description:** The Korteweg-De Vries (KdV) equation is a nonlinear partial differential equation that describes shallow water waves and solitons. This 1D dataset contains soliton solutions with varying dispersion parameters, demonstrating wave propagation and interaction phenomena.
393
+
394
+ **Mathematical Formulation:**
395
+ KdV is a 1D PDE representing waves on a shallow-water surface. The governing equation follows the form:
396
+
397
+ ```
398
+ 0 = ∂ₜu + u·∂ₓu + δ²∂ₓₓₓu
399
+ ```
400
+
401
+ **Parameters of Interest:**
402
+ - **δ**: The physical parameter representing the strength of the dispersive effect on the system
403
+ - In shallow water wave theory, δ is a unit-less quantity roughly indicating the relative depth of the water
404
+
405
+ **Data Characteristics:**
406
+ - Partial Derivatives: 3
407
+ - Time-dependent: Yes (hyperbolic)
408
+ - Spatial Resolution: 256
409
+ - Parameters: δ ∈ [0.8,5]
410
+ - Temporal Resolution: 0.73/102 seconds
411
+ - Parameter Values: 100
412
+ - Initial Conditions/Trajectories: 100
413
+
414
+ **Evaluation Splits:**
415
+ - **Test (ID)**: δ ∈ [1.22, 2.48] ∪ [3.32, 4.58]
416
+ - **OOD (Non-Extreme)**: δ ∈ [2.48, 3.32]
417
+ - **OOD (Extreme)**: δ ∈ [0.8, 1.22] ∪ [4.58, 5]
418
+
419
+ **Generation Parameters:**
420
+ - **Domain**: Periodic domain [0,L]
421
+ - **Spatial Discretization**: Pseudospectral method with Fourier basis (Nₓ = 256 grid points)
422
+ - **Time Integration**: Implicit Runge-Kutta method (Radau IIA, order 5)
423
+ - **Implementation**: SciPy's `solve_ivp` on CPU
424
+ - **Generation Time**: ≈ 12 hours
425
+ - **Burn-in Period**: 40 simulation seconds
426
+
427
+ **Initial Conditions:**
428
+ Initial conditions are sampled from a distribution over a truncated Fourier Series:
429
+
430
+ ```
431
+ u₀(x) = Σ_{k=1}^K A_k sin(2πl_k x/L + φ_k)
432
+ ```
433
+
434
+ where:
435
+ - A_k, φ_k ~ U(0,1)
436
+ - l_k ~ U(1,3)
437
+
438
+ **File Structure:**
439
+ ```
440
+ filename: delta=3.5_ic=42.h5
441
+ ```
442
+ Contents:
443
+ - `tensor`: Solution field with shape [time, spatial_dim]
444
+ - `x-coordinate`: Spatial grid points
445
+ - `t-coordinate`: Time points
446
+
447
+ ### 4e. 2D Darcy Flow
448
+
449
+ <img src="images/2ddf.png" alt="2DDF" width="400">
450
+
451
+ **Description:** The 2D Darcy Flow dataset represents steady-state flow through porous media with piecewise constant diffusion coefficients. This time-independent system is commonly used in groundwater flow modeling and subsurface transport problems. All solutions converge to a non-trivial steady-state solution based on the diffusion coefficient field.
452
+
453
+ **Mathematical Formulation:**
454
+ The 2D steady-state Darcy flow equation on a unit box Ω = (0,1)² is a second-order linear elliptic PDE with Dirichlet boundary conditions:
455
+
456
+ ```
457
+ -∇·(a(x)∇u(x)) = f(x), for x ∈ Ω
458
+ u(x) = 0, for x ∈ ∂Ω
459
+ ```
460
+
461
+ where:
462
+ - a ∈ L∞((0,1)²;R⁺) is a piecewise constant diffusion coefficient
463
+ - u(x) is the pressure field
464
+ - f(x) = 1 is a fixed forcing function
465
+
466
+ **Parameters of Interest:**
467
+ - **a(x)**: Piecewise constant diffusion coefficient field (spatially varying parameter)
468
+
469
+ **Data Characteristics:**
470
+ - Partial Derivatives: 2
471
+ - Time-dependent: No (elliptic)
472
+ - Spatial Resolutions: 241×241, 421×421
473
+ - Parameters: Piecewise constant diffusion coefficient a ∈ L∞((0,1)²;R⁺)
474
+ - Temporal Resolution: N/A (steady-state)
475
+ - Parameter Values: 2048
476
+ - Initial Conditions/Trajectories: N/A
477
+
478
+ **Evaluation Splits:**
479
+
480
+ Unlike time-dependent systems with scalar parameters, Darcy Flow does not admit parameter splits based on numeric ranges. Instead, splits are defined using a derived statistic of the coefficient field.
481
+
482
+ Let \( r(a) \) denote the fraction of grid points in the coefficient field \( a(x) \) that take the maximum value (12).
483
+ This statistic is approximately normally distributed across coefficient fields.
484
+
485
+ Splits are defined as:
486
+
487
+ - **Test (ID):** Coefficient fields whose \( r(a) \) lies within the central mass of the distribution
488
+ - **OOD (Non-Extreme):** Not applicable
489
+ - **OOD (Extreme):** Coefficient fields whose \( r(a) \) lies in the tails beyond \( \pm 1.5\sigma \)
490
+
491
+
492
+ **Generation Parameters:**
493
+ - **Solver**: Second-order finite difference method
494
+ - **Implementation**: Originally written in Matlab, runs on CPU
495
+ - **Resolution**: 421×421 (original), with lower resolution dataset generated by downsampling
496
+ - **Coefficient Field Sampling**: a(x) is sampled from μ = Γ(N(0, -Δ + 9I)⁻²)
497
+ - **Gamma Mapping**: Element-wise map where a_i ~ N(0, -Δ + 9I)⁻² → {3,12}
498
+ - a_i → 12 when a_i ≥ 0
499
+ - a_i → 3 when a_i < 0
500
+ - **Boundary Conditions**: Zero Neumann boundary conditions on the Laplacian over the coefficient field
501
+
502
+ **File Structure:**
503
+ ```
504
+ filename: sample_1024.h5
505
+ ```
506
+ Contents:
507
+ - `coeff`: Piecewise constant coefficient field
508
+ - `sol`: Solution field
509
+
510
+
511
+ ## 5. Adding a New Dataset
512
+
513
+ The PDEInvBench framework is designed to be modular, allowing you to add new PDE systems. This section describes how to add a new dataset to the repository. For information about data format requirements, see [Section 4.1](#41-data-format).
514
+
515
+ ### Table of Contents
516
+ - [Step 1: Add PDE Type to Utils](#step-1-add-pde-type-to-utils)
517
+ - [Step 2: Add PDE Attributes](#step-2-add-pde-attributes)
518
+ - [Step 3: Add Parameter Normalization Stats](#step-3-add-parameter-normalization-stats)
519
+ - [Step 4: Add Parameter Extraction Logic](#step-4-add-parameter-extraction-logic)
520
+ - [Step 5: Create a Dataset Handler](#step-5-create-a-dataset-handler-if-needed)
521
+ - [Step 6: Create a Data Configuration](#step-6-create-a-data-configuration)
522
+ - [Step 7: Add Residual Functions](#step-7-add-residual-functions)
523
+ - [Step 8: Create a Combined Configuration](#step-8-create-a-combined-configuration)
524
+ - [Step 9: Generate and Prepare Data](#step-9-generate-and-prepare-data)
525
+ - [Step 10: Run Experiments](#step-10-run-experiments)
526
+ - [Data Format Requirements](#data-format-requirements)
527
+
528
+ ### Step 1: Add PDE Type to Utils
529
+
530
+ First, add your new PDE system to `pdeinvbench/utils/types.py`:
531
+
532
+ ```python
533
+ class PDE(enum.Enum):
534
+ """
535
+ Describes which PDE system currently being used.
536
+ """
537
+ # Existing PDEs...
538
+ ReactionDiffusion1D = "Reaction Diffusion 1D"
539
+ ReactionDiffusion2D = "Reaction Diffusion 2D"
540
+ NavierStokes2D = "Navier Stokes 2D"
541
+ # Add your new PDE
542
+ YourNewPDE = "Your New PDE Description"
543
+ ```
544
+
545
+ ### Step 2: Add PDE Attributes
546
+
547
+ Update the attribute dictionaries in `pdeinvbench/utils/types.py` with information about your new PDE:
548
+
549
+ ```python
550
+ # Number of partial derivatives
551
+ PDE_PARTIALS = {
552
+ # Existing PDEs...
553
+ PDE.YourNewPDE: 3, # Number of partial derivatives needed
554
+ }
555
+
556
+ # Number of spatial dimensions
557
+ PDE_NUM_SPATIAL = {
558
+ # Existing PDEs...
559
+ PDE.YourNewPDE: 2, # 1 for 1D PDEs, 2 for 2D PDEs
560
+ }
561
+
562
+ # Spatial size of the grid
563
+ PDE_SPATIAL_SIZE = {
564
+ # Existing PDEs...
565
+ PDE.YourNewPDE: [128, 128], # Spatial dimensions of your dataset
566
+ }
567
+
568
+ # High-resolution spatial size (if applicable)
569
+ HIGH_RESOLUTION_PDE_SPATIAL_SIZE = {
570
+ # Existing PDEs...
571
+ PDE.YourNewPDE: [512, 512], # High-res dimensions
572
+ }
573
+
574
+ # Number of parameters
575
+ PDE_NUM_PARAMETERS = {
576
+ # Existing PDEs...
577
+ PDE.YourNewPDE: 2, # Number of parameters in your PDE
578
+ }
579
+
580
+ # Parameter values
581
+ PDE_PARAM_VALUES = {
582
+ # Existing PDEs...
583
+ PDE.YourNewPDE: {
584
+ "param1": [0.1, 0.2, 0.3], # List of possible values for param1
585
+ "param2": [1.0, 2.0, 3.0], # List of possible values for param2
586
+ },
587
+ }
588
+
589
+ # Number of data channels
590
+ PDE_NUM_CHANNELS = {
591
+ # Existing PDEs...
592
+ PDE.YourNewPDE: 2, # Number of channels in your solution field
593
+ }
594
+
595
+ # Number of timesteps in the trajectory
596
+ PDE_TRAJ_LEN = {
597
+ # Existing PDEs...
598
+ PDE.YourNewPDE: 100, # Number of timesteps in your trajectories
599
+ }
600
+ ```
601
+
602
+ ### Step 3: Add Parameter Normalization Stats
603
+
604
+ Update `pdeinvbench/data/utils.py` with normalization statistics for your PDE parameters:
605
+
606
+ ```python
607
+ PARAM_NORMALIZATION_STATS = {
608
+ # Existing PDEs...
609
+ PDE.YourNewPDE: {
610
+ "param1": (0.2, 0.05), # (mean, std) for param1
611
+ "param2": (2.0, 0.5), # (mean, std) for param2
612
+ },
613
+ }
614
+ ```
615
+
616
+ ### Step 4: Add Parameter Extraction Logic
617
+
618
+ Add logic to extract parameters from your dataset files in `extract_params_from_path` function inside the dataset class:
619
+
620
+ ```python
621
+ def extract_params_from_path(path: str, pde: PDE) -> dict:
622
+ # Existing code...
623
+ elif pde == PDE.YourNewPDE:
624
+ # Parse the filename to extract parameters
625
+ name = os.path.basename(path)
626
+ # Example: extract parameters from filename format "param1=X_param2=Y.h5"
627
+ param1 = torch.Tensor([float(name.split("param1=")[1].split("_")[0])])
628
+ param2 = torch.Tensor([float(name.split("param2=")[1].split(".")[0])])
629
+ param_dict = {"param1": param1, "param2": param2}
630
+ # Existing code...
631
+ return param_dict
632
+ ```
633
+
634
+ ### Step 5: Create a Dataset Handler (if needed)
635
+
636
+ If your PDE requires special handling beyond what `PDE_MultiParam` provides, create a new dataset class in `pdeinvbench/data/`:
637
+
638
+ ```python
639
+ # Example: pdeinvbench/data/your_new_pde_dataset.py
640
+ import torch
641
+ from torch.utils.data import Dataset
642
+
643
+ class YourNewPDEDataset(Dataset):
644
+ """
645
+ Custom dataset class for your new PDE system.
646
+ """
647
+ def __init__(
648
+ self,
649
+ data_root: str,
650
+ pde: PDE,
651
+ n_past: int,
652
+ n_future: int,
653
+ mode: str,
654
+ train: bool,
655
+ # Other parameters...
656
+ ):
657
+ # Initialization code...
658
+ pass
659
+
660
+ def __len__(self):
661
+ # Implementation...
662
+ pass
663
+
664
+ def __getitem__(self, index: int):
665
+ # Implementation...
666
+ pass
667
+ ```
668
+
669
+ Add your new dataset to `pdeinvbench/data/__init__.py`:
670
+
671
+ ```python
672
+ from .pde_multiparam import PDE_MultiParam
673
+ from .your_new_pde_dataset import YourNewPDEDataset
674
+
675
+ __all__ = ["PDE_MultiParam", "YourNewPDEDataset"]
676
+ ```
677
+
678
+ ```markdown
679
+ ### Step 6: Create System Configuration
680
+
681
+ Create `configs/system_params/your_new_pde.yaml`:
682
+
683
+ ```yaml
684
+ # configs/system_params/your_new_pde.yaml
685
+ defaults:
686
+ - base
687
+
688
+ # ============ Data Parameters ============
689
+ name: "your_new_pde_inverse"
690
+ data_root: "/path/to/your/data"
691
+ pde_name: "Your New PDE Description" # Must match PDE enum value
692
+ num_channels: 2 # Number of solution channels (e.g., u and v)
693
+ cutoff_first_n_frames: 0 # How many initial frames to skip
694
+
695
+ # ============ Model Parameters ============
696
+ downsampler_input_dim: 2 # 1 for 1D systems, 2 for 2D systems
697
+ params_to_predict: ["param1", "param2"] # What parameters to predict
698
+ normalize: True # Whether to normalize predicted parameters
699
+ ```
700
+
701
+ Then create the top-level config `configs/your_new_pde.yaml`:
702
+
703
+ ```yaml
704
+ # configs/your_new_pde.yaml
705
+ name: your_new_pde
706
+ defaults:
707
+ - _self_
708
+ - base
709
+ - override system_params: your_new_pde
710
+ ```
711
+
712
+ The existing configs/data/base.yaml automatically references ${system_params.*} so data loading works out of the box. Run experiments with:
713
+
714
+
715
+ ```yaml
716
+ python train_inverse.py --config-name=your_new_pde
717
+ python train_inverse.py --config-name=your_new_pde model=fno
718
+ python train_inverse.py --config-name=your_new_pde model=resnet
719
+ ```
720
+
721
+ ### Step 7: Add Residual Functions
722
+
723
+ Implement residual functions for your PDE in `pdeinvbench/losses/pde_residuals.py`:
724
+
725
+ ```python
726
+ def your_new_pde_residual(
727
+ sol: torch.Tensor,
728
+ params: Dict[str, torch.Tensor],
729
+ spatial_grid: Tuple[torch.Tensor, ...],
730
+ t: torch.Tensor,
731
+ return_partials: bool = False,
732
+ ) -> Union[torch.Tensor, Tuple[torch.Tensor, torch.Tensor]]:
733
+ """
734
+ Compute the residual for your new PDE.
735
+
736
+ Args:
737
+ sol: Solution field
738
+ params: Dictionary of PDE parameters
739
+ spatial_grid: Spatial grid coordinates
740
+ t: Time coordinates
741
+ return_partials: Whether to return partial derivatives
742
+
743
+ Returns:
744
+ Residual tensor or (residual, partials) if return_partials=True
745
+ """
746
+ # Implementation...
747
+ pass
748
+ ```
749
+
750
+ Register your residual function in `get_pde_residual_function`:
751
+
752
+ ```python
753
+ def get_pde_residual_function(pde: PDE) -> Callable:
754
+ """Return the appropriate residual function for the given PDE."""
755
+ if pde == PDE.ReactionDiffusion2D:
756
+ return reaction_diffusion_2d_residual
757
+ # Add your PDE
758
+ elif pde == PDE.YourNewPDE:
759
+ return your_new_pde_residual
760
+ # Other PDEs...
761
+ else:
762
+ raise ValueError(f"Unknown PDE type: {pde}")
763
+ ```
764
+
765
+ ### Step 8: Create a Combined Configuration
766
+
767
+ Create a combined configuration that uses your dataset:
768
+
769
+ ```yaml
770
+ # configs/your_new_pde.yaml
771
+ name: "your_new_pde"
772
+ defaults:
773
+ - _self_
774
+ - base
775
+ - override data: your_new_pde
776
+ ```
777
+
778
+ ### Step 9: Generate and Prepare Data
779
+
780
+ Make sure your data is properly formatted and stored in the expected directory structure:
781
+
782
+ ```
783
+ /path/to/your/data/
784
+ ├── train/
785
+ │ ├── param1=0.1_param2=1.0.h5
786
+ │ ├── param1=0.2_param2=2.0.h5
787
+ │ └── ...
788
+ ├── validation/
789
+ │ ├── param1=0.15_param2=1.5.h5
790
+ │ └── ...
791
+ └── test/
792
+ ├── param1=0.25_param2=2.5.h5
793
+ └── ...
794
+ ```
795
+
796
+ Each HDF5 file should contain:
797
+ - Solution trajectories
798
+ - Grid information (x, y, t)
799
+ - Any other metadata needed for your PDE
800
+
801
+ ### Step 10: Run Experiments
802
+
803
+ You can now run experiments with your new dataset:
804
+
805
+ ```bash
806
+ python train_inverse.py --config-name=your_new_pde
807
+ ```
808
+
809
+ ### Data Format Requirements
810
+
811
+ The primary dataset class `PDE_MultiParam` expects data in HDF5 format with specific structure:
812
+
813
+ - **1D PDEs**: Each HDF5 file contains a single trajectory with keys:
814
+ - `tensor`: The solution field with shape `[time, spatial_dim]`
815
+ - `x-coordinate`: Spatial grid points
816
+ - `t-coordinate`: Time points
817
+
818
+ - **2D PDEs**: Each HDF5 file contains multiple trajectories (one per IC):
819
+ - `0001/data`: Solution field with shape `[time, spatial_dim_1, spatial_dim_2, channels]`
820
+ - `0001/grid/x`: x-coordinates
821
+ - `0001/grid/y`: y-coordinates
822
+ - `0001/grid/t`: Time points
823
+
824
+ - **File naming**: The filename should encode the PDE parameters, following the format expected by `extract_params_from_path`
825
+
croissant.json ADDED
@@ -0,0 +1,3 @@
 
 
 
 
1
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