{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "f09246e8",
   "metadata": {},
   "source": [
    "# Easy Dev for Post-hoc OOD Detectors\n",
    "\n",
    "This notebook integrates some simple post-hoc OOD detection methods.\n",
    "\n",
    "We choose ImageNet-1K as in-distribution (ID) and load a pretrained vision transformer (ViT)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "4dc297c1",
   "metadata": {},
   "outputs": [],
   "source": [
    "%load_ext autoreload\n",
    "%autoreload 2"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8b218878",
   "metadata": {},
   "source": [
    "## Load Models and Dataset"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "f155277c",
   "metadata": {},
   "outputs": [],
   "source": [
    "from openood.utils import config\n",
    "from openood.datasets import get_dataloader, get_ood_dataloader\n",
    "from openood.evaluators import get_evaluator\n",
    "from openood.networks import get_network"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "48968bc2",
   "metadata": {},
   "outputs": [],
   "source": [
    "# load config files for cifar10 baseline\n",
    "config_files = [\n",
    "    './configs/datasets/cifar10/cifar10.yml',\n",
    "    './configs/datasets/cifar10/cifar10_ood.yml',\n",
    "    './configs/networks/resnet18_32x32.yml',\n",
    "    './configs/pipelines/test/test_ood.yml',\n",
    "    './configs/preprocessors/base_preprocessor.yml',\n",
    "    './configs/postprocessors/msp.yml',\n",
    "]\n",
    "config = config.Config(*config_files)\n",
    "# modify config \n",
    "config.network.checkpoint = './results/cifar10_resnet18_32x32_base_e100_lr0.1/best.ckpt'\n",
    "config.network.pretrained = True\n",
    "config.num_workers = 8\n",
    "config.save_output = False\n",
    "config.parse_refs()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "a99ab6de",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "dataset:\n",
       "    image_size: 32\n",
       "    name: cifar10\n",
       "    num_classes: 10\n",
       "    num_gpus: 1\n",
       "    num_machines: 1\n",
       "    num_workers: 8\n",
       "    pre_size: 32\n",
       "    split_names: ['train', 'val', 'test']\n",
       "    test:\n",
       "        batch_size: 200\n",
       "        data_dir: ./data/images_classic/\n",
       "        dataset_class: ImglistDataset\n",
       "        imglist_pth: ./data/benchmark_imglist/cifar10/test_cifar10.txt\n",
       "        interpolation: bilinear\n",
       "        shuffle: False\n",
       "    train:\n",
       "        batch_size: 128\n",
       "        data_dir: ./data/images_classic/\n",
       "        dataset_class: ImglistDataset\n",
       "        imglist_pth: ./data/benchmark_imglist/cifar10/train_cifar10.txt\n",
       "        interpolation: bilinear\n",
       "        shuffle: True\n",
       "    val:\n",
       "        batch_size: 200\n",
       "        data_dir: ./data/images_classic/\n",
       "        dataset_class: ImglistDataset\n",
       "        imglist_pth: ./data/benchmark_imglist/cifar10/val_cifar10.txt\n",
       "        interpolation: bilinear\n",
       "        shuffle: False\n",
       "evaluator:\n",
       "    name: ood\n",
       "exp_name: cifar10_resnet18_32x32_test_ood_ood_msp_default\n",
       "merge_option: default\n",
       "machine_rank: 0\n",
       "mark: default\n",
       "network:\n",
       "    checkpoint: ./results/cifar10_resnet18_32x32_base_e100_lr0.1/best.ckpt\n",
       "    name: resnet18_32x32\n",
       "    num_classes: 10\n",
       "    num_gpus: 1\n",
       "    pretrained: True\n",
       "num_gpus: 1\n",
       "num_machines: 1\n",
       "num_workers: 8\n",
       "ood_dataset:\n",
       "    batch_size: 128\n",
       "    dataset_class: ImglistDataset\n",
       "    farood:\n",
       "        datasets: ['mnist', 'svhn', 'texture', 'place365']\n",
       "        mnist:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/cifar10/test_mnist.txt\n",
       "        place365:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/cifar10/test_places365.txt\n",
       "        svhn:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/cifar10/test_svhn.txt\n",
       "        texture:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/cifar10/test_texture.txt\n",
       "    image_size: 32\n",
       "    interpolation: bilinear\n",
       "    name: cifar10_ood\n",
       "    nearood:\n",
       "        cifar100:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/cifar10/test_cifar100.txt\n",
       "        datasets: ['cifar100', 'tin']\n",
       "        tin:\n",
       "            data_dir: ./data/images_classic/\n",
       "            imglist_pth: ./data/benchmark_imglist/osr_tin20/test_tin.txt\n",
       "    num_classes: 10\n",
       "    num_gpus: 1\n",
       "    num_machines: 1\n",
       "    num_workers: 8\n",
       "    shuffle: False\n",
       "    split_names: ['val', 'nearood', 'farood']\n",
       "    val:\n",
       "        data_dir: ./data/images_classic/\n",
       "        imglist_pth: ./data/benchmark_imglist/cifar10/val_cifar100.txt\n",
       "output_dir: ./results/\n",
       "pipeline:\n",
       "    name: test_ood\n",
       "postprocessor:\n",
       "    name: msp\n",
       "preprocessor:\n",
       "    name: base\n",
       "recorder:\n",
       "    save_csv: True\n",
       "    save_scores: True\n",
       "save_output: False"
      ]
     },
     "execution_count": 15,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "config"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "35d30b38",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Model Loading resnet18_32x32 Completed!\n"
     ]
    }
   ],
   "source": [
    "# get dataloader\n",
    "id_loader_dict = get_dataloader(config)\n",
    "ood_loader_dict = get_ood_dataloader(config)\n",
    "# init network\n",
    "net = get_network(config.network).cuda()\n",
    "# init ood evaluator\n",
    "evaluator = get_evaluator(config)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "2043b57f",
   "metadata": {},
   "source": [
    "## Feature Extraction"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "f430f169",
   "metadata": {},
   "outputs": [],
   "source": [
    "from tqdm import tqdm\n",
    "import numpy as np\n",
    "import torch\n",
    "import os.path as osp"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "512fe29c",
   "metadata": {},
   "outputs": [],
   "source": [
    "def save_arr_to_dir(arr, dir):\n",
    "    with open(dir, 'wb') as f:\n",
    "        np.save(f, arr)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "418778f7",
   "metadata": {},
   "outputs": [],
   "source": [
    "save_root = f'./results/{config.exp_name}'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "e2f12809",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Extracting reults...: 100%|██████████| 45/45 [00:03<00:00, 13.48it/s]\n",
      "Extracting reults...: 100%|██████████| 5/5 [00:00<00:00,  6.84it/s]\n"
     ]
    }
   ],
   "source": [
    "# save id (test & val) results\n",
    "net.eval()\n",
    "modes = ['test', 'val']\n",
    "for mode in modes:\n",
    "    dl = id_loader_dict[mode]\n",
    "    dataiter = iter(dl)\n",
    "    \n",
    "    logits_list = []\n",
    "    feature_list = []\n",
    "    label_list = []\n",
    "    \n",
    "    for i in tqdm(range(1,\n",
    "                    len(dataiter) + 1),\n",
    "                    desc='Extracting reults...',\n",
    "                    position=0,\n",
    "                    leave=True):\n",
    "        batch = next(dataiter)\n",
    "        data = batch['data'].cuda()\n",
    "        label = batch['label']\n",
    "        with torch.no_grad():\n",
    "            logits_cls, feature = net(data, return_feature=True)\n",
    "        logits_list.append(logits_cls.data.to('cpu').numpy())\n",
    "        feature_list.append(feature.data.to('cpu').numpy())\n",
    "        label_list.append(label.numpy())\n",
    "\n",
    "    logits_arr = np.concatenate(logits_list)\n",
    "    feature_arr = np.concatenate(feature_list)\n",
    "    label_arr = np.concatenate(label_list)\n",
    "    \n",
    "    save_arr_to_dir(logits_arr, osp.join(save_root, 'id', f'{mode}_logits.npy'))\n",
    "    save_arr_to_dir(feature_arr, osp.join(save_root, 'id', f'{mode}_feature.npy'))\n",
    "    save_arr_to_dir(label_arr, osp.join(save_root, 'id', f'{mode}_labels.npy'))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "id": "5cded214",
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Extracting reults...: 100%|██████████| 71/71 [00:01<00:00, 35.57it/s]\n",
      "Extracting reults...: 100%|██████████| 141/141 [00:04<00:00, 32.65it/s]\n",
      "Extracting reults...: 100%|██████████| 547/547 [00:15<00:00, 34.35it/s]\n",
      "Extracting reults...: 100%|██████████| 204/204 [00:05<00:00, 34.51it/s]\n",
      "Extracting reults...: 100%|██████████| 45/45 [00:06<00:00,  7.47it/s]\n",
      "Extracting reults...: 100%|██████████| 286/286 [00:19<00:00, 14.37it/s]\n"
     ]
    }
   ],
   "source": [
    "# save ood results\n",
    "net.eval()\n",
    "ood_splits = ['nearood', 'farood']\n",
    "for ood_split in ood_splits:\n",
    "    for dataset_name, ood_dl in ood_loader_dict[ood_split].items():\n",
    "        dataiter = iter(ood_dl)\n",
    "    \n",
    "        logits_list = []\n",
    "        feature_list = []\n",
    "        label_list = []\n",
    "\n",
    "        for i in tqdm(range(1,\n",
    "                        len(dataiter) + 1),\n",
    "                        desc='Extracting reults...',\n",
    "                        position=0,\n",
    "                        leave=True):\n",
    "            batch = next(dataiter)\n",
    "            data = batch['data'].cuda()\n",
    "            label = batch['label']\n",
    "\n",
    "            with torch.no_grad():\n",
    "                logits_cls, feature = net(data, return_feature=True)\n",
    "            logits_list.append(logits_cls.data.to('cpu').numpy())\n",
    "            feature_list.append(feature.data.to('cpu').numpy())\n",
    "            label_list.append(label.numpy())\n",
    "\n",
    "        logits_arr = np.concatenate(logits_list)\n",
    "        feature_arr = np.concatenate(feature_list)\n",
    "        label_arr = np.concatenate(label_list)\n",
    "\n",
    "        save_arr_to_dir(logits_arr, osp.join(save_root, ood_split, f'{dataset_name}_logits.npy'))\n",
    "        save_arr_to_dir(feature_arr, osp.join(save_root, ood_split, f'{dataset_name}_feature.npy'))\n",
    "        save_arr_to_dir(label_arr, osp.join(save_root, ood_split, f'{dataset_name}_labels.npy'))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0b69a9ed",
   "metadata": {},
   "source": [
    "## MSP Evaluation"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "db3f705b",
   "metadata": {},
   "outputs": [],
   "source": [
    "# build msp method (pass in pre-saved logits)\n",
    "def msp_postprocess(logits):\n",
    "    score = torch.softmax(logits, dim=1)\n",
    "    conf, pred = torch.max(score, dim=1)\n",
    "    return pred, conf"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "a1cac34c",
   "metadata": {},
   "outputs": [],
   "source": [
    "# load logits, feature, label for this benchmark\n",
    "results = dict()\n",
    "# for id\n",
    "modes = ['val', 'test']\n",
    "results['id'] = dict()\n",
    "for mode in modes:\n",
    "    results['id'][mode] = dict()\n",
    "    results['id'][mode]['feature'] = np.load(osp.join(save_root, 'id', f'{mode}_feature.npy'))\n",
    "    results['id'][mode]['logits'] = np.load(osp.join(save_root, 'id', f'{mode}_logits.npy'))\n",
    "    results['id'][mode]['labels'] = np.load(osp.join(save_root, 'id', f'{mode}_labels.npy'))\n",
    "\n",
    "# for ood\n",
    "split_types = ['nearood', 'farood']\n",
    "for split_type in split_types:\n",
    "    results[split_type] = dict()\n",
    "    dataset_names = config['ood_dataset'][split_type].datasets\n",
    "    for dataset_name in dataset_names:\n",
    "        results[split_type][dataset_name] = dict()\n",
    "        results[split_type][dataset_name]['feature'] = np.load(osp.join(save_root, split_type, f'{dataset_name}_feature.npy'))\n",
    "        results[split_type][dataset_name]['logits'] = np.load(osp.join(save_root, split_type, f'{dataset_name}_logits.npy'))\n",
    "        results[split_type][dataset_name]['labels'] = np.load(osp.join(save_root, split_type, f'{dataset_name}_labels.npy'))\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "id": "79697d8c",
   "metadata": {},
   "outputs": [],
   "source": [
    "def print_nested_dict(dict_obj, indent = 0):\n",
    "    ''' Pretty Print nested dictionary with given indent level  \n",
    "    '''\n",
    "    # Iterate over all key-value pairs of dictionary\n",
    "    for key, value in dict_obj.items():\n",
    "        # If value is dict type, then print nested dict \n",
    "        if isinstance(value, dict):\n",
    "            print(' ' * indent, key, ':', '{')\n",
    "            print_nested_dict(value, indent + 2)\n",
    "            print(' ' * indent, '}')\n",
    "        else:\n",
    "            print(' ' * indent, key, ':', value.shape)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "id": "2dfe3614",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      " id : {\n",
      "   val : {\n",
      "     feature : (1000, 512)\n",
      "     logits : (1000, 10)\n",
      "     labels : (1000,)\n",
      "   }\n",
      "   test : {\n",
      "     feature : (9000, 512)\n",
      "     logits : (9000, 10)\n",
      "     labels : (9000,)\n",
      "   }\n",
      " }\n",
      " nearood : {\n",
      "   cifar100 : {\n",
      "     feature : (9000, 512)\n",
      "     logits : (9000, 10)\n",
      "     labels : (9000,)\n",
      "   }\n",
      "   tin : {\n",
      "     feature : (18000, 512)\n",
      "     logits : (18000, 10)\n",
      "     labels : (18000,)\n",
      "   }\n",
      " }\n",
      " farood : {\n",
      "   mnist : {\n",
      "     feature : (70000, 512)\n",
      "     logits : (70000, 10)\n",
      "     labels : (70000,)\n",
      "   }\n",
      "   svhn : {\n",
      "     feature : (26032, 512)\n",
      "     logits : (26032, 10)\n",
      "     labels : (26032,)\n",
      "   }\n",
      "   texture : {\n",
      "     feature : (5640, 512)\n",
      "     logits : (5640, 10)\n",
      "     labels : (5640,)\n",
      "   }\n",
      "   place365 : {\n",
      "     feature : (36500, 512)\n",
      "     logits : (36500, 10)\n",
      "     labels : (36500,)\n",
      "   }\n",
      " }\n"
     ]
    }
   ],
   "source": [
    "print_nested_dict(results)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "a3af6815",
   "metadata": {},
   "outputs": [],
   "source": [
    "# get pred, conf, gt from MSP postprocessor (can change to your custom_postprocessor here)\n",
    "postprocess_results = dict()\n",
    "# id\n",
    "modes = ['val', 'test']\n",
    "postprocess_results['id'] = dict()\n",
    "for mode in modes:\n",
    "    pred, conf = msp_postprocess(torch.from_numpy(results['id'][mode]['logits']))\n",
    "    pred, conf = pred.numpy(), conf.numpy()\n",
    "    gt = results['id'][mode]['labels']\n",
    "    postprocess_results['id'][mode] = [pred, conf, gt]\n",
    "\n",
    "# ood\n",
    "split_types = ['nearood', 'farood']\n",
    "for split_type in split_types:\n",
    "    postprocess_results[split_type] = dict()\n",
    "    dataset_names = config['ood_dataset'][split_type].datasets\n",
    "    for dataset_name in dataset_names:\n",
    "        pred, conf = msp_postprocess(torch.from_numpy(results[split_type][dataset_name]['logits']))\n",
    "        pred, conf = pred.numpy(), conf.numpy()\n",
    "        gt = results[split_type][dataset_name]['labels']\n",
    "        gt = -1 * np.ones_like(gt)   # hard set to -1 here\n",
    "        postprocess_results[split_type][dataset_name] = [pred, conf, gt]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "41e3dac6",
   "metadata": {},
   "outputs": [],
   "source": [
    "def print_all_metrics(metrics):\n",
    "    [fpr, auroc, aupr_in, aupr_out,\n",
    "        ccr_4, ccr_3, ccr_2, ccr_1, accuracy] \\\n",
    "        = metrics\n",
    "    print('FPR@95: {:.2f}, AUROC: {:.2f}'.format(100 * fpr, 100 * auroc),\n",
    "            end=' ',\n",
    "            flush=True)\n",
    "    print('AUPR_IN: {:.2f}, AUPR_OUT: {:.2f}'.format(\n",
    "        100 * aupr_in, 100 * aupr_out),\n",
    "            flush=True)\n",
    "    print('CCR: {:.2f}, {:.2f}, {:.2f}, {:.2f},'.format(\n",
    "        ccr_4 * 100, ccr_3 * 100, ccr_2 * 100, ccr_1 * 100),\n",
    "            end=' ',\n",
    "            flush=True)\n",
    "    print('ACC: {:.2f}'.format(accuracy * 100), flush=True)\n",
    "    print(u'\\u2500' * 70, flush=True)   "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "b16e6f5b",
   "metadata": {},
   "outputs": [],
   "source": [
    "from openood.evaluators.metrics import compute_all_metrics\n",
    "def eval_ood(postprocess_results):\n",
    "    [id_pred, id_conf, id_gt] = postprocess_results['id']['test']\n",
    "    split_types = ['nearood', 'farood']\n",
    "\n",
    "    for split_type in split_types:\n",
    "        metrics_list = []\n",
    "        print(f\"Performing evaluation on {split_type} datasets...\")\n",
    "        dataset_names = config['ood_dataset'][split_type].datasets\n",
    "        \n",
    "        for dataset_name in dataset_names:\n",
    "            [ood_pred, ood_conf, ood_gt] = postprocess_results[split_type][dataset_name]\n",
    "\n",
    "            pred = np.concatenate([id_pred, ood_pred])\n",
    "            conf = np.concatenate([id_conf, ood_conf])\n",
    "            label = np.concatenate([id_gt, ood_gt])\n",
    "            print(f'Computing metrics on {dataset_name} dataset...')\n",
    "\n",
    "            ood_metrics = compute_all_metrics(conf, label, pred)\n",
    "            print_all_metrics(ood_metrics)\n",
    "            metrics_list.append(ood_metrics)\n",
    "        print('Computing mean metrics...', flush=True)\n",
    "        metrics_list = np.array(metrics_list)\n",
    "        metrics_mean = np.mean(metrics_list, axis=0)   \n",
    "        print_all_metrics(metrics_mean)\n",
    "\n",
    " "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "335686fe",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Performing evaluation on nearood datasets...\n",
      "Computing metrics on cifar100 dataset...\n",
      "FPR@95: 62.01, AUROC: 87.11 AUPR_IN: 85.93, AUPR_OUT: 85.25\n",
      "CCR: 0.36, 1.84, 11.31, 68.38, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing metrics on tin dataset...\n",
      "FPR@95: 60.31, AUROC: 86.61 AUPR_IN: 73.79, AUPR_OUT: 91.74\n",
      "CCR: 0.14, 0.88, 7.78, 67.00, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing mean metrics...\n",
      "FPR@95: 61.16, AUROC: 86.86 AUPR_IN: 79.86, AUPR_OUT: 88.50\n",
      "CCR: 0.25, 1.36, 9.54, 67.69, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Performing evaluation on farood datasets...\n",
      "Computing metrics on mnist dataset...\n",
      "FPR@95: 58.56, AUROC: 89.92 AUPR_IN: 66.95, AUPR_OUT: 98.10\n",
      "CCR: 5.49, 11.13, 31.94, 77.40, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing metrics on svhn dataset...\n",
      "FPR@95: 52.26, AUROC: 90.76 AUPR_IN: 77.86, AUPR_OUT: 95.65\n",
      "CCR: 0.08, 0.73, 17.60, 80.54, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing metrics on texture dataset...\n",
      "FPR@95: 59.75, AUROC: 88.73 AUPR_IN: 91.28, AUPR_OUT: 80.60\n",
      "CCR: 0.09, 0.34, 9.69, 76.00, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing metrics on place365 dataset...\n",
      "FPR@95: 58.70, AUROC: 88.03 AUPR_IN: 65.24, AUPR_OUT: 96.04\n",
      "CCR: 0.39, 2.11, 13.42, 71.66, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n",
      "Computing mean metrics...\n",
      "FPR@95: 57.32, AUROC: 89.36 AUPR_IN: 75.33, AUPR_OUT: 92.60\n",
      "CCR: 1.51, 3.58, 18.16, 76.40, ACC: 95.34\n",
      "──────────────────────────────────────────────────────────────────────\n"
     ]
    }
   ],
   "source": [
    "eval_ood(postprocess_results)"
   ]
  },
  {
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   "execution_count": null,
   "id": "f2ce6263",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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