first commit

LICENSE

@@ -0,0 +1,35 @@
+S-Lab License 1.0
+
+Copyright 2024 S-Lab
+
+Redistribution and use for non-commercial purpose in source and 
+binary forms, with or without modification, are permitted provided 
+that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright 
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright 
+   notice, this list of conditions and the following disclaimer in 
+   the documentation and/or other materials provided with the 
+   distribution.
+
+3. Neither the name of the copyright holder nor the names of its 
+   contributors may be used to endorse or promote products derived 
+   from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+In the event that redistribution and/or use for commercial purpose in 
+source or binary forms, with or without modification is required, 
+please contact the contributor(s) of the work.

README.md

@@ -5,6 +5,9 @@ colorFrom: green
 colorTo: purple
 sdk: gradio
 sdk_version: 5.8.0
+python_version: 3.10
+suggested_storage: small
+models: OAOA/InvSR
 app_file: app.py
 pinned: false
 license: other

app.py

@@ -0,0 +1,141 @@
+#!/usr/bin/env python
+# -*- coding:utf-8 -*-
+# Power by Zongsheng Yue 2024-12-11 17:17:41
+
+import spaces
+import warnings
+warnings.filterwarnings("ignore")
+
+import argparse
+import numpy as np
+import gradio as gr
+from pathlib import Path
+from omegaconf import OmegaConf
+from sampler_invsr import InvSamplerSR
+
+from utils import util_common
+from utils import util_image
+from basicsr.utils.download_util import load_file_from_url
+
+def get_configs(num_steps=1, chopping_size=128, seed=12345):
+    configs = OmegaConf.load("./configs/sample-sd-turbo.yaml")
+
+    if num_steps == 1:
+        configs.timesteps = [200,]
+    elif num_steps == 2:
+        configs.timesteps = [200, 100]
+    elif num_steps == 3:
+        configs.timesteps = [200, 100, 50]
+    elif num_steps == 4:
+        configs.timesteps = [200, 150, 100, 50]
+    elif num_steps == 5:
+        configs.timesteps = [250, 200, 150, 100, 50]
+    else:
+        assert num_steps <= 250
+        configs.timesteps = np.linspace(
+            start=250, stop=0, num=num_steps, endpoint=False, dtype=np.int64()
+        ).tolist()
+    print(f'Setting timesteps for inference: {configs.timesteps}')
+
+    # path to save noise predictor
+    started_ckpt_path = "noise_predictor_sd_turbo_v5.pth"
+    # started_ckpt_dir = "./weights"
+    # util_common.mkdir(started_ckpt_dir, delete=False, parents=True)
+    # started_ckpt_path = Path(started_ckpt_dir) / started_ckpt_name
+    # if not started_ckpt_path.exists():
+        # load_file_from_url(
+            # url="https://huggingface.co/OAOA/InvSR/resolve/main/noise_predictor_sd_turbo_v5.pth",
+            # model_dir=started_ckpt_dir,
+            # progress=True,
+            # file_name=started_ckpt_name,
+        # )
+    configs.model_start.ckpt_path = started_ckpt_path
+
+    configs.bs = 1
+    configs.seed = 12345
+    configs.basesr.chopping.pch_size = chopping_size
+
+    return configs
+
+@spaces.GPU
+def predict(in_path, num_steps=1, chopping_size=128, seed=12345):
+    configs = get_configs(num_steps=num_steps, chopping_size=chopping_size, seed=12345)
+
+    sampler = InvSamplerSR(configs)
+
+    out_dir = Path('invsr_output')
+    if not out_dir.exists():
+        out_dir.mkdir()
+    sampler.inference(in_path, out_path=out_dir, bs=1)
+
+    out_path = out_dir / f"{Path(in_path).stem}.png"
+    assert out_path.exists(), 'Super-resolution failed!'
+    im_sr = util_image.imread(out_path, chn="rgb", dtype="uint8")
+
+    return im_sr, str(out_path)
+
+title = "Arbitrary-steps Image Super-resolution via Diffusion Inversion"
+description = r"""
+<b>Official Gradio demo</b> for <a href='https://github.com/zsyOAOA/InvSR' target='_blank'><b>Arbitrary-steps Image Super-resolution via Diffuion Inversion</b></a>.<br>
+🔥 InvSR is an image super-resolution method via Diffusion Inversion, supporting arbitrary sampling steps.<br>
+"""
+article = r"""
+If you've found InvSR useful for your research or projects, please show your support by ⭐ the <a href='https://github.com/zsyOAOA/InvSR' target='_blank'>Github Repo</a>. Thanks!
+[![GitHub Stars](https://img.shields.io/github/stars/zsyOAOA/InvSR?affiliations=OWNER&color=green&style=social)](https://github.com/zsyOAOA/InvSR)
+
+---
+If our work is useful for your research, please consider citing:
+```bibtex
+@article{yue2024InvSR,
+  title={Arbitrary-steps Image Super-resolution via Diffusion Inversion},
+  author={Yue, Zongsheng and Kang, Liao and Loy, Chen Change},
+  journal = {arXiv preprint arXiv:2412.09013},
+  year={2024},
+}
+```
+
+📋 **License**
+
+This project is licensed under <a rel="license" href="https://github.com/zsyOAOA/InvSR/blob/master/LICENSE">S-Lab License 1.0</a>.
+Redistribution and use for non-commercial purposes should follow this license.
+
+📧 **Contact**
+
+If you have any questions, please feel free to contact me via <b>zsyzam@gmail.com</b>.
+![visitors](https://visitor-badge.laobi.icu/badge?page_id=zsyOAOA/InvSR)
+"""
+demo = gr.Interface(
+    fn=predict,
+    inputs=[
+        gr.Image(type="filepath", label="Input: Low Quality Image"),
+        gr.Dropdown(
+            choices=[1,2,3,4,5],
+            value=1,
+            label="Number of steps",
+            ),
+        gr.Dropdown(
+            choices=[128, 256],
+            value=128,
+            label="Chopping size",
+            ),
+        gr.Number(value=12345, precision=0, label="Ranom seed")
+    ],
+    outputs=[
+        gr.Image(type="numpy", label="Output: High Quality Image"),
+        gr.File(label="Download the output")
+    ],
+    title=title,
+    description=description,
+    article=article,
+    examples=[
+        ['./testdata/RealSet80/29.jpg',  3, 128, 12345],
+        ['./testdata/RealSet80/32.jpg',  1, 128, 12345],
+        ['./testdata/RealSet80/0030.jpg',  1, 128, 12345],
+        ['./testdata/RealSet80/2684538-PH.jpg', 1, 128, 12345],
+        ['./testdata/RealSet80/oldphoto6.png', 1, 128, 12345],
+      ]
+    )
+
+demo.queue(max_size=5)
+demo.launch(share=True)
+

basicsr/__init__.py

@@ -0,0 +1,4 @@
+# https://github.com/xinntao/BasicSR
+# flake8: noqa
+from .data import *
+from .utils import *

basicsr/data/__init__.py

@@ -0,0 +1,101 @@
+import importlib
+import numpy as np
+import random
+import torch
+import torch.utils.data
+from copy import deepcopy
+from functools import partial
+from os import path as osp
+
+from basicsr.data.prefetch_dataloader import PrefetchDataLoader
+from basicsr.utils import get_root_logger, scandir
+from basicsr.utils.dist_util import get_dist_info
+from basicsr.utils.registry import DATASET_REGISTRY
+
+__all__ = ['build_dataset', 'build_dataloader']
+
+# automatically scan and import dataset modules for registry
+# scan all the files under the data folder with '_dataset' in file names
+data_folder = osp.dirname(osp.abspath(__file__))
+dataset_filenames = [osp.splitext(osp.basename(v))[0] for v in scandir(data_folder) if v.endswith('_dataset.py')]
+# import all the dataset modules
+_dataset_modules = [importlib.import_module(f'basicsr.data.{file_name}') for file_name in dataset_filenames]
+
+
+def build_dataset(dataset_opt):
+    """Build dataset from options.
+
+    Args:
+        dataset_opt (dict): Configuration for dataset. It must contain:
+            name (str): Dataset name.
+            type (str): Dataset type.
+    """
+    dataset_opt = deepcopy(dataset_opt)
+    dataset = DATASET_REGISTRY.get(dataset_opt['type'])(dataset_opt)
+    logger = get_root_logger()
+    logger.info(f'Dataset [{dataset.__class__.__name__}] - {dataset_opt["name"]} is built.')
+    return dataset
+
+
+def build_dataloader(dataset, dataset_opt, num_gpu=1, dist=False, sampler=None, seed=None):
+    """Build dataloader.
+
+    Args:
+        dataset (torch.utils.data.Dataset): Dataset.
+        dataset_opt (dict): Dataset options. It contains the following keys:
+            phase (str): 'train' or 'val'.
+            num_worker_per_gpu (int): Number of workers for each GPU.
+            batch_size_per_gpu (int): Training batch size for each GPU.
+        num_gpu (int): Number of GPUs. Used only in the train phase.
+            Default: 1.
+        dist (bool): Whether in distributed training. Used only in the train
+            phase. Default: False.
+        sampler (torch.utils.data.sampler): Data sampler. Default: None.
+        seed (int | None): Seed. Default: None
+    """
+    phase = dataset_opt['phase']
+    rank, _ = get_dist_info()
+    if phase == 'train':
+        if dist:  # distributed training
+            batch_size = dataset_opt['batch_size_per_gpu']
+            num_workers = dataset_opt['num_worker_per_gpu']
+        else:  # non-distributed training
+            multiplier = 1 if num_gpu == 0 else num_gpu
+            batch_size = dataset_opt['batch_size_per_gpu'] * multiplier
+            num_workers = dataset_opt['num_worker_per_gpu'] * multiplier
+        dataloader_args = dict(
+            dataset=dataset,
+            batch_size=batch_size,
+            shuffle=False,
+            num_workers=num_workers,
+            sampler=sampler,
+            drop_last=True)
+        if sampler is None:
+            dataloader_args['shuffle'] = True
+        dataloader_args['worker_init_fn'] = partial(
+            worker_init_fn, num_workers=num_workers, rank=rank, seed=seed) if seed is not None else None
+    elif phase in ['val', 'test']:  # validation
+        dataloader_args = dict(dataset=dataset, batch_size=1, shuffle=False, num_workers=0)
+    else:
+        raise ValueError(f"Wrong dataset phase: {phase}. Supported ones are 'train', 'val' and 'test'.")
+
+    dataloader_args['pin_memory'] = dataset_opt.get('pin_memory', False)
+    dataloader_args['persistent_workers'] = dataset_opt.get('persistent_workers', False)
+
+    prefetch_mode = dataset_opt.get('prefetch_mode')
+    if prefetch_mode == 'cpu':  # CPUPrefetcher
+        num_prefetch_queue = dataset_opt.get('num_prefetch_queue', 1)
+        logger = get_root_logger()
+        logger.info(f'Use {prefetch_mode} prefetch dataloader: num_prefetch_queue = {num_prefetch_queue}')
+        return PrefetchDataLoader(num_prefetch_queue=num_prefetch_queue, **dataloader_args)
+    else:
+        # prefetch_mode=None: Normal dataloader
+        # prefetch_mode='cuda': dataloader for CUDAPrefetcher
+        return torch.utils.data.DataLoader(**dataloader_args)
+
+
+def worker_init_fn(worker_id, num_workers, rank, seed):
+    # Set the worker seed to num_workers * rank + worker_id + seed
+    worker_seed = num_workers * rank + worker_id + seed
+    np.random.seed(worker_seed)
+    random.seed(worker_seed)

basicsr/data/data_sampler.py

@@ -0,0 +1,48 @@
+import math
+import torch
+from torch.utils.data.sampler import Sampler
+
+
+class EnlargedSampler(Sampler):
+    """Sampler that restricts data loading to a subset of the dataset.
+
+    Modified from torch.utils.data.distributed.DistributedSampler
+    Support enlarging the dataset for iteration-based training, for saving
+    time when restart the dataloader after each epoch
+
+    Args:
+        dataset (torch.utils.data.Dataset): Dataset used for sampling.
+        num_replicas (int | None): Number of processes participating in
+            the training. It is usually the world_size.
+        rank (int | None): Rank of the current process within num_replicas.
+        ratio (int): Enlarging ratio. Default: 1.
+    """
+
+    def __init__(self, dataset, num_replicas, rank, ratio=1):
+        self.dataset = dataset
+        self.num_replicas = num_replicas
+        self.rank = rank
+        self.epoch = 0
+        self.num_samples = math.ceil(len(self.dataset) * ratio / self.num_replicas)
+        self.total_size = self.num_samples * self.num_replicas
+
+    def __iter__(self):
+        # deterministically shuffle based on epoch
+        g = torch.Generator()
+        g.manual_seed(self.epoch)
+        indices = torch.randperm(self.total_size, generator=g).tolist()
+
+        dataset_size = len(self.dataset)
+        indices = [v % dataset_size for v in indices]
+
+        # subsample
+        indices = indices[self.rank:self.total_size:self.num_replicas]
+        assert len(indices) == self.num_samples
+
+        return iter(indices)
+
+    def __len__(self):
+        return self.num_samples
+
+    def set_epoch(self, epoch):
+        self.epoch = epoch

basicsr/data/data_util.py

@@ -0,0 +1,315 @@
+import cv2
+import numpy as np
+import torch
+from os import path as osp
+from torch.nn import functional as F
+
+from basicsr.data.transforms import mod_crop
+from basicsr.utils import img2tensor, scandir
+
+
+def read_img_seq(path, require_mod_crop=False, scale=1, return_imgname=False):
+    """Read a sequence of images from a given folder path.
+
+    Args:
+        path (list[str] | str): List of image paths or image folder path.
+        require_mod_crop (bool): Require mod crop for each image.
+            Default: False.
+        scale (int): Scale factor for mod_crop. Default: 1.
+        return_imgname(bool): Whether return image names. Default False.
+
+    Returns:
+        Tensor: size (t, c, h, w), RGB, [0, 1].
+        list[str]: Returned image name list.
+    """
+    if isinstance(path, list):
+        img_paths = path
+    else:
+        img_paths = sorted(list(scandir(path, full_path=True)))
+    imgs = [cv2.imread(v).astype(np.float32) / 255. for v in img_paths]
+
+    if require_mod_crop:
+        imgs = [mod_crop(img, scale) for img in imgs]
+    imgs = img2tensor(imgs, bgr2rgb=True, float32=True)
+    imgs = torch.stack(imgs, dim=0)
+
+    if return_imgname:
+        imgnames = [osp.splitext(osp.basename(path))[0] for path in img_paths]
+        return imgs, imgnames
+    else:
+        return imgs
+
+
+def generate_frame_indices(crt_idx, max_frame_num, num_frames, padding='reflection'):
+    """Generate an index list for reading `num_frames` frames from a sequence
+    of images.
+
+    Args:
+        crt_idx (int): Current center index.
+        max_frame_num (int): Max number of the sequence of images (from 1).
+        num_frames (int): Reading num_frames frames.
+        padding (str): Padding mode, one of
+            'replicate' | 'reflection' | 'reflection_circle' | 'circle'
+            Examples: current_idx = 0, num_frames = 5
+            The generated frame indices under different padding mode:
+            replicate: [0, 0, 0, 1, 2]
+            reflection: [2, 1, 0, 1, 2]
+            reflection_circle: [4, 3, 0, 1, 2]
+            circle: [3, 4, 0, 1, 2]
+
+    Returns:
+        list[int]: A list of indices.
+    """
+    assert num_frames % 2 == 1, 'num_frames should be an odd number.'
+    assert padding in ('replicate', 'reflection', 'reflection_circle', 'circle'), f'Wrong padding mode: {padding}.'
+
+    max_frame_num = max_frame_num - 1  # start from 0
+    num_pad = num_frames // 2
+
+    indices = []
+    for i in range(crt_idx - num_pad, crt_idx + num_pad + 1):
+        if i < 0:
+            if padding == 'replicate':
+                pad_idx = 0
+            elif padding == 'reflection':
+                pad_idx = -i
+            elif padding == 'reflection_circle':
+                pad_idx = crt_idx + num_pad - i
+            else:
+                pad_idx = num_frames + i
+        elif i > max_frame_num:
+            if padding == 'replicate':
+                pad_idx = max_frame_num
+            elif padding == 'reflection':
+                pad_idx = max_frame_num * 2 - i
+            elif padding == 'reflection_circle':
+                pad_idx = (crt_idx - num_pad) - (i - max_frame_num)
+            else:
+                pad_idx = i - num_frames
+        else:
+            pad_idx = i
+        indices.append(pad_idx)
+    return indices
+
+
+def paired_paths_from_lmdb(folders, keys):
+    """Generate paired paths from lmdb files.
+
+    Contents of lmdb. Taking the `lq.lmdb` for example, the file structure is:
+
+    ::
+
+        lq.lmdb
+        ├── data.mdb
+        ├── lock.mdb
+        ├── meta_info.txt
+
+    The data.mdb and lock.mdb are standard lmdb files and you can refer to
+    https://lmdb.readthedocs.io/en/release/ for more details.
+
+    The meta_info.txt is a specified txt file to record the meta information
+    of our datasets. It will be automatically created when preparing
+    datasets by our provided dataset tools.
+    Each line in the txt file records
+    1)image name (with extension),
+    2)image shape,
+    3)compression level, separated by a white space.
+    Example: `baboon.png (120,125,3) 1`
+
+    We use the image name without extension as the lmdb key.
+    Note that we use the same key for the corresponding lq and gt images.
+
+    Args:
+        folders (list[str]): A list of folder path. The order of list should
+            be [input_folder, gt_folder].
+        keys (list[str]): A list of keys identifying folders. The order should
+            be in consistent with folders, e.g., ['lq', 'gt'].
+            Note that this key is different from lmdb keys.
+
+    Returns:
+        list[str]: Returned path list.
+    """
+    assert len(folders) == 2, ('The len of folders should be 2 with [input_folder, gt_folder]. '
+                               f'But got {len(folders)}')
+    assert len(keys) == 2, f'The len of keys should be 2 with [input_key, gt_key]. But got {len(keys)}'
+    input_folder, gt_folder = folders
+    input_key, gt_key = keys
+
+    if not (input_folder.endswith('.lmdb') and gt_folder.endswith('.lmdb')):
+        raise ValueError(f'{input_key} folder and {gt_key} folder should both in lmdb '
+                         f'formats. But received {input_key}: {input_folder}; '
+                         f'{gt_key}: {gt_folder}')
+    # ensure that the two meta_info files are the same
+    with open(osp.join(input_folder, 'meta_info.txt')) as fin:
+        input_lmdb_keys = [line.split('.')[0] for line in fin]
+    with open(osp.join(gt_folder, 'meta_info.txt')) as fin:
+        gt_lmdb_keys = [line.split('.')[0] for line in fin]
+    if set(input_lmdb_keys) != set(gt_lmdb_keys):
+        raise ValueError(f'Keys in {input_key}_folder and {gt_key}_folder are different.')
+    else:
+        paths = []
+        for lmdb_key in sorted(input_lmdb_keys):
+            paths.append(dict([(f'{input_key}_path', lmdb_key), (f'{gt_key}_path', lmdb_key)]))
+        return paths
+
+
+def paired_paths_from_meta_info_file(folders, keys, meta_info_file, filename_tmpl):
+    """Generate paired paths from an meta information file.
+
+    Each line in the meta information file contains the image names and
+    image shape (usually for gt), separated by a white space.
+
+    Example of an meta information file:
+    ```
+    0001_s001.png (480,480,3)
+    0001_s002.png (480,480,3)
+    ```
+
+    Args:
+        folders (list[str]): A list of folder path. The order of list should
+            be [input_folder, gt_folder].
+        keys (list[str]): A list of keys identifying folders. The order should
+            be in consistent with folders, e.g., ['lq', 'gt'].
+        meta_info_file (str): Path to the meta information file.
+        filename_tmpl (str): Template for each filename. Note that the
+            template excludes the file extension. Usually the filename_tmpl is
+            for files in the input folder.
+
+    Returns:
+        list[str]: Returned path list.
+    """
+    assert len(folders) == 2, ('The len of folders should be 2 with [input_folder, gt_folder]. '
+                               f'But got {len(folders)}')
+    assert len(keys) == 2, f'The len of keys should be 2 with [input_key, gt_key]. But got {len(keys)}'
+    input_folder, gt_folder = folders
+    input_key, gt_key = keys
+
+    with open(meta_info_file, 'r') as fin:
+        gt_names = [line.strip().split(' ')[0] for line in fin]
+
+    paths = []
+    for gt_name in gt_names:
+        basename, ext = osp.splitext(osp.basename(gt_name))
+        input_name = f'{filename_tmpl.format(basename)}{ext}'
+        input_path = osp.join(input_folder, input_name)
+        gt_path = osp.join(gt_folder, gt_name)
+        paths.append(dict([(f'{input_key}_path', input_path), (f'{gt_key}_path', gt_path)]))
+    return paths
+
+
+def paired_paths_from_folder(folders, keys, filename_tmpl):
+    """Generate paired paths from folders.
+
+    Args:
+        folders (list[str]): A list of folder path. The order of list should
+            be [input_folder, gt_folder].
+        keys (list[str]): A list of keys identifying folders. The order should
+            be in consistent with folders, e.g., ['lq', 'gt'].
+        filename_tmpl (str): Template for each filename. Note that the
+            template excludes the file extension. Usually the filename_tmpl is
+            for files in the input folder.
+
+    Returns:
+        list[str]: Returned path list.
+    """
+    assert len(folders) == 2, ('The len of folders should be 2 with [input_folder, gt_folder]. '
+                               f'But got {len(folders)}')
+    assert len(keys) == 2, f'The len of keys should be 2 with [input_key, gt_key]. But got {len(keys)}'
+    input_folder, gt_folder = folders
+    input_key, gt_key = keys
+
+    input_paths = list(scandir(input_folder))
+    gt_paths = list(scandir(gt_folder))
+    assert len(input_paths) == len(gt_paths), (f'{input_key} and {gt_key} datasets have different number of images: '
+                                               f'{len(input_paths)}, {len(gt_paths)}.')
+    paths = []
+    for gt_path in gt_paths:
+        basename, ext = osp.splitext(osp.basename(gt_path))
+        input_name = f'{filename_tmpl.format(basename)}{ext}'
+        input_path = osp.join(input_folder, input_name)
+        assert input_name in input_paths, f'{input_name} is not in {input_key}_paths.'
+        gt_path = osp.join(gt_folder, gt_path)
+        paths.append(dict([(f'{input_key}_path', input_path), (f'{gt_key}_path', gt_path)]))
+    return paths
+
+
+def paths_from_folder(folder):
+    """Generate paths from folder.
+
+    Args:
+        folder (str): Folder path.
+
+    Returns:
+        list[str]: Returned path list.
+    """
+
+    paths = list(scandir(folder))
+    paths = [osp.join(folder, path) for path in paths]
+    return paths
+
+
+def paths_from_lmdb(folder):
+    """Generate paths from lmdb.
+
+    Args:
+        folder (str): Folder path.
+
+    Returns:
+        list[str]: Returned path list.
+    """
+    if not folder.endswith('.lmdb'):
+        raise ValueError(f'Folder {folder}folder should in lmdb format.')
+    with open(osp.join(folder, 'meta_info.txt')) as fin:
+        paths = [line.split('.')[0] for line in fin]
+    return paths
+
+
+def generate_gaussian_kernel(kernel_size=13, sigma=1.6):
+    """Generate Gaussian kernel used in `duf_downsample`.
+
+    Args:
+        kernel_size (int): Kernel size. Default: 13.
+        sigma (float): Sigma of the Gaussian kernel. Default: 1.6.
+
+    Returns:
+        np.array: The Gaussian kernel.
+    """
+    from scipy.ndimage import filters as filters
+    kernel = np.zeros((kernel_size, kernel_size))
+    # set element at the middle to one, a dirac delta
+    kernel[kernel_size // 2, kernel_size // 2] = 1
+    # gaussian-smooth the dirac, resulting in a gaussian filter
+    return filters.gaussian_filter(kernel, sigma)
+
+
+def duf_downsample(x, kernel_size=13, scale=4):
+    """Downsamping with Gaussian kernel used in the DUF official code.
+
+    Args:
+        x (Tensor): Frames to be downsampled, with shape (b, t, c, h, w).
+        kernel_size (int): Kernel size. Default: 13.
+        scale (int): Downsampling factor. Supported scale: (2, 3, 4).
+            Default: 4.
+
+    Returns:
+        Tensor: DUF downsampled frames.
+    """
+    assert scale in (2, 3, 4), f'Only support scale (2, 3, 4), but got {scale}.'
+
+    squeeze_flag = False
+    if x.ndim == 4:
+        squeeze_flag = True
+        x = x.unsqueeze(0)
+    b, t, c, h, w = x.size()
+    x = x.view(-1, 1, h, w)
+    pad_w, pad_h = kernel_size // 2 + scale * 2, kernel_size // 2 + scale * 2
+    x = F.pad(x, (pad_w, pad_w, pad_h, pad_h), 'reflect')
+
+    gaussian_filter = generate_gaussian_kernel(kernel_size, 0.4 * scale)
+    gaussian_filter = torch.from_numpy(gaussian_filter).type_as(x).unsqueeze(0).unsqueeze(0)
+    x = F.conv2d(x, gaussian_filter, stride=scale)
+    x = x[:, :, 2:-2, 2:-2]
+    x = x.view(b, t, c, x.size(2), x.size(3))
+    if squeeze_flag:
+        x = x.squeeze(0)
+    return x

basicsr/data/degradations.py

@@ -0,0 +1,765 @@
+import cv2
+import math
+import numpy as np
+import random
+import torch
+from scipy import special
+from scipy.stats import multivariate_normal
+# from torchvision.transforms.functional_tensor import rgb_to_grayscale
+from torchvision.transforms.functional import rgb_to_grayscale
+
+# -------------------------------------------------------------------- #
+# --------------------------- blur kernels --------------------------- #
+# -------------------------------------------------------------------- #
+
+
+# --------------------------- util functions --------------------------- #
+def sigma_matrix2(sig_x, sig_y, theta):
+    """Calculate the rotated sigma matrix (two dimensional matrix).
+
+    Args:
+        sig_x (float):
+        sig_y (float):
+        theta (float): Radian measurement.
+
+    Returns:
+        ndarray: Rotated sigma matrix.
+    """
+    d_matrix = np.array([[sig_x**2, 0], [0, sig_y**2]])
+    u_matrix = np.array([[np.cos(theta), -np.sin(theta)], [np.sin(theta), np.cos(theta)]])
+    return np.dot(u_matrix, np.dot(d_matrix, u_matrix.T))
+
+
+def mesh_grid(kernel_size):
+    """Generate the mesh grid, centering at zero.
+
+    Args:
+        kernel_size (int):
+
+    Returns:
+        xy (ndarray): with the shape (kernel_size, kernel_size, 2)
+        xx (ndarray): with the shape (kernel_size, kernel_size)
+        yy (ndarray): with the shape (kernel_size, kernel_size)
+    """
+    ax = np.arange(-kernel_size // 2 + 1., kernel_size // 2 + 1.)
+    xx, yy = np.meshgrid(ax, ax)
+    xy = np.hstack((xx.reshape((kernel_size * kernel_size, 1)), yy.reshape(kernel_size * kernel_size,
+                                                                           1))).reshape(kernel_size, kernel_size, 2)
+    return xy, xx, yy
+
+
+def pdf2(sigma_matrix, grid):
+    """Calculate PDF of the bivariate Gaussian distribution.
+
+    Args:
+        sigma_matrix (ndarray): with the shape (2, 2)
+        grid (ndarray): generated by :func:`mesh_grid`,
+            with the shape (K, K, 2), K is the kernel size.
+
+    Returns:
+        kernel (ndarrray): un-normalized kernel.
+    """
+    inverse_sigma = np.linalg.inv(sigma_matrix)
+    kernel = np.exp(-0.5 * np.sum(np.dot(grid, inverse_sigma) * grid, 2))
+    return kernel
+
+
+def cdf2(d_matrix, grid):
+    """Calculate the CDF of the standard bivariate Gaussian distribution.
+        Used in skewed Gaussian distribution.
+
+    Args:
+        d_matrix (ndarrasy): skew matrix.
+        grid (ndarray): generated by :func:`mesh_grid`,
+            with the shape (K, K, 2), K is the kernel size.
+
+    Returns:
+        cdf (ndarray): skewed cdf.
+    """
+    rv = multivariate_normal([0, 0], [[1, 0], [0, 1]])
+    grid = np.dot(grid, d_matrix)
+    cdf = rv.cdf(grid)
+    return cdf
+
+
+def bivariate_Gaussian(kernel_size, sig_x, sig_y, theta, grid=None, isotropic=True):
+    """Generate a bivariate isotropic or anisotropic Gaussian kernel.
+
+    In the isotropic mode, only `sig_x` is used. `sig_y` and `theta` is ignored.
+
+    Args:
+        kernel_size (int):
+        sig_x (float):
+        sig_y (float):
+        theta (float): Radian measurement.
+        grid (ndarray, optional): generated by :func:`mesh_grid`,
+            with the shape (K, K, 2), K is the kernel size. Default: None
+        isotropic (bool):
+
+    Returns:
+        kernel (ndarray): normalized kernel.
+    """
+    if grid is None:
+        grid, _, _ = mesh_grid(kernel_size)
+    if isotropic:
+        sigma_matrix = np.array([[sig_x**2, 0], [0, sig_x**2]])
+    else:
+        sigma_matrix = sigma_matrix2(sig_x, sig_y, theta)
+    kernel = pdf2(sigma_matrix, grid)
+    kernel = kernel / np.sum(kernel)
+    return kernel
+
+
+def bivariate_generalized_Gaussian(kernel_size, sig_x, sig_y, theta, beta, grid=None, isotropic=True):
+    """Generate a bivariate generalized Gaussian kernel.
+
+    ``Paper: Parameter Estimation For Multivariate Generalized Gaussian Distributions``
+
+    In the isotropic mode, only `sig_x` is used. `sig_y` and `theta` is ignored.
+
+    Args:
+        kernel_size (int):
+        sig_x (float):
+        sig_y (float):
+        theta (float): Radian measurement.
+        beta (float): shape parameter, beta = 1 is the normal distribution.
+        grid (ndarray, optional): generated by :func:`mesh_grid`,
+            with the shape (K, K, 2), K is the kernel size. Default: None
+
+    Returns:
+        kernel (ndarray): normalized kernel.
+    """
+    if grid is None:
+        grid, _, _ = mesh_grid(kernel_size)
+    if isotropic:
+        sigma_matrix = np.array([[sig_x**2, 0], [0, sig_x**2]])
+    else:
+        sigma_matrix = sigma_matrix2(sig_x, sig_y, theta)
+    inverse_sigma = np.linalg.inv(sigma_matrix)
+    kernel = np.exp(-0.5 * np.power(np.sum(np.dot(grid, inverse_sigma) * grid, 2), beta))
+    kernel = kernel / np.sum(kernel)
+    return kernel
+
+
+def bivariate_plateau(kernel_size, sig_x, sig_y, theta, beta, grid=None, isotropic=True):
+    """Generate a plateau-like anisotropic kernel.
+
+    1 / (1+x^(beta))
+
+    Reference: https://stats.stackexchange.com/questions/203629/is-there-a-plateau-shaped-distribution
+
+    In the isotropic mode, only `sig_x` is used. `sig_y` and `theta` is ignored.
+
+    Args:
+        kernel_size (int):
+        sig_x (float):
+        sig_y (float):
+        theta (float): Radian measurement.
+        beta (float): shape parameter, beta = 1 is the normal distribution.
+        grid (ndarray, optional): generated by :func:`mesh_grid`,
+            with the shape (K, K, 2), K is the kernel size. Default: None
+
+    Returns:
+        kernel (ndarray): normalized kernel.
+    """
+    if grid is None:
+        grid, _, _ = mesh_grid(kernel_size)
+    if isotropic:
+        sigma_matrix = np.array([[sig_x**2, 0], [0, sig_x**2]])
+    else:
+        sigma_matrix = sigma_matrix2(sig_x, sig_y, theta)
+    inverse_sigma = np.linalg.inv(sigma_matrix)
+    kernel = np.reciprocal(np.power(np.sum(np.dot(grid, inverse_sigma) * grid, 2), beta) + 1)
+    kernel = kernel / np.sum(kernel)
+    return kernel
+
+
+def random_bivariate_Gaussian(kernel_size,
+                              sigma_x_range,
+                              sigma_y_range,
+                              rotation_range,
+                              noise_range=None,
+                              isotropic=True):
+    """Randomly generate bivariate isotropic or anisotropic Gaussian kernels.
+
+    In the isotropic mode, only `sigma_x_range` is used. `sigma_y_range` and `rotation_range` is ignored.
+
+    Args:
+        kernel_size (int):
+        sigma_x_range (tuple): [0.6, 5]
+        sigma_y_range (tuple): [0.6, 5]
+        rotation range (tuple): [-math.pi, math.pi]
+        noise_range(tuple, optional): multiplicative kernel noise,
+            [0.75, 1.25]. Default: None
+
+    Returns:
+        kernel (ndarray):
+    """
+    assert kernel_size % 2 == 1, 'Kernel size must be an odd number.'
+    assert sigma_x_range[0] < sigma_x_range[1], 'Wrong sigma_x_range.'
+    sigma_x = np.random.uniform(sigma_x_range[0], sigma_x_range[1])
+    if isotropic is False:
+        assert sigma_y_range[0] < sigma_y_range[1], 'Wrong sigma_y_range.'
+        assert rotation_range[0] < rotation_range[1], 'Wrong rotation_range.'
+        sigma_y = np.random.uniform(sigma_y_range[0], sigma_y_range[1])
+        rotation = np.random.uniform(rotation_range[0], rotation_range[1])
+    else:
+        sigma_y = sigma_x
+        rotation = 0
+
+    kernel = bivariate_Gaussian(kernel_size, sigma_x, sigma_y, rotation, isotropic=isotropic)
+
+    # add multiplicative noise
+    if noise_range is not None:
+        assert noise_range[0] < noise_range[1], 'Wrong noise range.'
+        noise = np.random.uniform(noise_range[0], noise_range[1], size=kernel.shape)
+        kernel = kernel * noise
+    kernel = kernel / np.sum(kernel)
+    return kernel
+
+
+def random_bivariate_generalized_Gaussian(kernel_size,
+                                          sigma_x_range,
+                                          sigma_y_range,
+                                          rotation_range,
+                                          beta_range,
+                                          noise_range=None,
+                                          isotropic=True):
+    """Randomly generate bivariate generalized Gaussian kernels.
+
+    In the isotropic mode, only `sigma_x_range` is used. `sigma_y_range` and `rotation_range` is ignored.
+
+    Args:
+        kernel_size (int):
+        sigma_x_range (tuple): [0.6, 5]
+        sigma_y_range (tuple): [0.6, 5]
+        rotation range (tuple): [-math.pi, math.pi]
+        beta_range (tuple): [0.5, 8]
+        noise_range(tuple, optional): multiplicative kernel noise,
+            [0.75, 1.25]. Default: None
+
+    Returns:
+        kernel (ndarray):
+    """
+    assert kernel_size % 2 == 1, 'Kernel size must be an odd number.'
+    assert sigma_x_range[0] < sigma_x_range[1], 'Wrong sigma_x_range.'
+    sigma_x = np.random.uniform(sigma_x_range[0], sigma_x_range[1])
+    if isotropic is False:
+        assert sigma_y_range[0] < sigma_y_range[1], 'Wrong sigma_y_range.'
+        assert rotation_range[0] < rotation_range[1], 'Wrong rotation_range.'
+        sigma_y = np.random.uniform(sigma_y_range[0], sigma_y_range[1])
+        rotation = np.random.uniform(rotation_range[0], rotation_range[1])
+    else:
+        sigma_y = sigma_x
+        rotation = 0
+
+    # assume beta_range[0] < 1 < beta_range[1]
+    if np.random.uniform() < 0.5:
+        beta = np.random.uniform(beta_range[0], 1)
+    else:
+        beta = np.random.uniform(1, beta_range[1])
+
+    kernel = bivariate_generalized_Gaussian(kernel_size, sigma_x, sigma_y, rotation, beta, isotropic=isotropic)
+
+    # add multiplicative noise
+    if noise_range is not None:
+        assert noise_range[0] < noise_range[1], 'Wrong noise range.'
+        noise = np.random.uniform(noise_range[0], noise_range[1], size=kernel.shape)
+        kernel = kernel * noise
+    kernel = kernel / np.sum(kernel)
+    return kernel
+
+
+def random_bivariate_plateau(kernel_size,
+                             sigma_x_range,
+                             sigma_y_range,
+                             rotation_range,
+                             beta_range,
+                             noise_range=None,
+                             isotropic=True):
+    """Randomly generate bivariate plateau kernels.
+
+    In the isotropic mode, only `sigma_x_range` is used. `sigma_y_range` and `rotation_range` is ignored.
+
+    Args:
+        kernel_size (int):
+        sigma_x_range (tuple): [0.6, 5]
+        sigma_y_range (tuple): [0.6, 5]
+        rotation range (tuple): [-math.pi/2, math.pi/2]
+        beta_range (tuple): [1, 4]
+        noise_range(tuple, optional): multiplicative kernel noise,
+            [0.75, 1.25]. Default: None
+
+    Returns:
+        kernel (ndarray):
+    """
+    assert kernel_size % 2 == 1, 'Kernel size must be an odd number.'
+    assert sigma_x_range[0] < sigma_x_range[1], 'Wrong sigma_x_range.'
+    sigma_x = np.random.uniform(sigma_x_range[0], sigma_x_range[1])
+    if isotropic is False:
+        assert sigma_y_range[0] < sigma_y_range[1], 'Wrong sigma_y_range.'
+        assert rotation_range[0] < rotation_range[1], 'Wrong rotation_range.'
+        sigma_y = np.random.uniform(sigma_y_range[0], sigma_y_range[1])
+        rotation = np.random.uniform(rotation_range[0], rotation_range[1])
+    else:
+        sigma_y = sigma_x
+        rotation = 0
+
+    # TODO: this may be not proper
+    if np.random.uniform() < 0.5:
+        beta = np.random.uniform(beta_range[0], 1)
+    else:
+        beta = np.random.uniform(1, beta_range[1])
+
+    kernel = bivariate_plateau(kernel_size, sigma_x, sigma_y, rotation, beta, isotropic=isotropic)
+    # add multiplicative noise
+    if noise_range is not None:
+        assert noise_range[0] < noise_range[1], 'Wrong noise range.'
+        noise = np.random.uniform(noise_range[0], noise_range[1], size=kernel.shape)
+        kernel = kernel * noise
+    kernel = kernel / np.sum(kernel)
+
+    return kernel
+
+
+def random_mixed_kernels(kernel_list,
+                         kernel_prob,
+                         kernel_size=21,
+                         sigma_x_range=(0.6, 5),
+                         sigma_y_range=(0.6, 5),
+                         rotation_range=(-math.pi, math.pi),
+                         betag_range=(0.5, 8),
+                         betap_range=(0.5, 8),
+                         noise_range=None):
+    """Randomly generate mixed kernels.
+
+    Args:
+        kernel_list (tuple): a list name of kernel types,
+            support ['iso', 'aniso', 'skew', 'generalized', 'plateau_iso',
+            'plateau_aniso']
+        kernel_prob (tuple): corresponding kernel probability for each
+            kernel type
+        kernel_size (int):
+        sigma_x_range (tuple): [0.6, 5]
+        sigma_y_range (tuple): [0.6, 5]
+        rotation range (tuple): [-math.pi, math.pi]
+        beta_range (tuple): [0.5, 8]
+        noise_range(tuple, optional): multiplicative kernel noise,
+            [0.75, 1.25]. Default: None
+
+    Returns:
+        kernel (ndarray):
+    """
+    kernel_type = random.choices(kernel_list, kernel_prob)[0]
+    if kernel_type == 'iso':
+        kernel = random_bivariate_Gaussian(
+            kernel_size, sigma_x_range, sigma_y_range, rotation_range, noise_range=noise_range, isotropic=True)
+    elif kernel_type == 'aniso':
+        kernel = random_bivariate_Gaussian(
+            kernel_size, sigma_x_range, sigma_y_range, rotation_range, noise_range=noise_range, isotropic=False)
+    elif kernel_type == 'generalized_iso':
+        kernel = random_bivariate_generalized_Gaussian(
+            kernel_size,
+            sigma_x_range,
+            sigma_y_range,
+            rotation_range,
+            betag_range,
+            noise_range=noise_range,
+            isotropic=True)
+    elif kernel_type == 'generalized_aniso':
+        kernel = random_bivariate_generalized_Gaussian(
+            kernel_size,
+            sigma_x_range,
+            sigma_y_range,
+            rotation_range,
+            betag_range,
+            noise_range=noise_range,
+            isotropic=False)
+    elif kernel_type == 'plateau_iso':
+        kernel = random_bivariate_plateau(
+            kernel_size, sigma_x_range, sigma_y_range, rotation_range, betap_range, noise_range=None, isotropic=True)
+    elif kernel_type == 'plateau_aniso':
+        kernel = random_bivariate_plateau(
+            kernel_size, sigma_x_range, sigma_y_range, rotation_range, betap_range, noise_range=None, isotropic=False)
+    return kernel
+
+
+np.seterr(divide='ignore', invalid='ignore')
+
+
+def circular_lowpass_kernel(cutoff, kernel_size, pad_to=0):
+    """2D sinc filter
+
+    Reference: https://dsp.stackexchange.com/questions/58301/2-d-circularly-symmetric-low-pass-filter
+
+    Args:
+        cutoff (float): cutoff frequency in radians (pi is max)
+        kernel_size (int): horizontal and vertical size, must be odd.
+        pad_to (int): pad kernel size to desired size, must be odd or zero.
+    """
+    assert kernel_size % 2 == 1, 'Kernel size must be an odd number.'
+    kernel = np.fromfunction(
+        lambda x, y: cutoff * special.j1(cutoff * np.sqrt(
+            (x - (kernel_size - 1) / 2)**2 + (y - (kernel_size - 1) / 2)**2)) / (2 * np.pi * np.sqrt(
+                (x - (kernel_size - 1) / 2)**2 + (y - (kernel_size - 1) / 2)**2)), [kernel_size, kernel_size])
+    kernel[(kernel_size - 1) // 2, (kernel_size - 1) // 2] = cutoff**2 / (4 * np.pi)
+    kernel = kernel / np.sum(kernel)
+    if pad_to > kernel_size:
+        pad_size = (pad_to - kernel_size) // 2
+        kernel = np.pad(kernel, ((pad_size, pad_size), (pad_size, pad_size)))
+    return kernel
+
+
+# ------------------------------------------------------------- #
+# --------------------------- noise --------------------------- #
+# ------------------------------------------------------------- #
+
+# ----------------------- Gaussian Noise ----------------------- #
+
+
+def generate_gaussian_noise(img, sigma=10, gray_noise=False):
+    """Generate Gaussian noise.
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        sigma (float): Noise scale (measured in range 255). Default: 10.
+
+    Returns:
+        (Numpy array): Returned noisy image, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    if gray_noise:
+        noise = np.float32(np.random.randn(*(img.shape[0:2]))) * sigma / 255.
+        noise = np.expand_dims(noise, axis=2).repeat(3, axis=2)
+    else:
+        noise = np.float32(np.random.randn(*(img.shape))) * sigma / 255.
+    return noise
+
+
+def add_gaussian_noise(img, sigma=10, clip=True, rounds=False, gray_noise=False):
+    """Add Gaussian noise.
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        sigma (float): Noise scale (measured in range 255). Default: 10.
+
+    Returns:
+        (Numpy array): Returned noisy image, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    noise = generate_gaussian_noise(img, sigma, gray_noise)
+    out = img + noise
+    if clip and rounds:
+        out = np.clip((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = np.clip(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+def generate_gaussian_noise_pt(img, sigma=10, gray_noise=0):
+    """Add Gaussian noise (PyTorch version).
+
+    Args:
+        img (Tensor): Shape (b, c, h, w), range[0, 1], float32.
+        scale (float | Tensor): Noise scale. Default: 1.0.
+
+    Returns:
+        (Tensor): Returned noisy image, shape (b, c, h, w), range[0, 1],
+            float32.
+    """
+    b, _, h, w = img.size()
+    if not isinstance(sigma, (float, int)):
+        sigma = sigma.view(img.size(0), 1, 1, 1)
+    if isinstance(gray_noise, (float, int)):
+        cal_gray_noise = gray_noise > 0
+    else:
+        gray_noise = gray_noise.view(b, 1, 1, 1)
+        cal_gray_noise = torch.sum(gray_noise) > 0
+
+    if cal_gray_noise:
+        noise_gray = torch.randn(*img.size()[2:4], dtype=img.dtype, device=img.device) * sigma / 255.
+        noise_gray = noise_gray.view(b, 1, h, w)
+
+    # always calculate color noise
+    noise = torch.randn(*img.size(), dtype=img.dtype, device=img.device) * sigma / 255.
+
+    if cal_gray_noise:
+        noise = noise * (1 - gray_noise) + noise_gray * gray_noise
+    return noise
+
+
+def add_gaussian_noise_pt(img, sigma=10, gray_noise=0, clip=True, rounds=False):
+    """Add Gaussian noise (PyTorch version).
+
+    Args:
+        img (Tensor): Shape (b, c, h, w), range[0, 1], float32.
+        scale (float | Tensor): Noise scale. Default: 1.0.
+
+    Returns:
+        (Tensor): Returned noisy image, shape (b, c, h, w), range[0, 1],
+            float32.
+    """
+    noise = generate_gaussian_noise_pt(img, sigma, gray_noise)
+    out = img + noise
+    if clip and rounds:
+        out = torch.clamp((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = torch.clamp(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+# ----------------------- Random Gaussian Noise ----------------------- #
+def random_generate_gaussian_noise(img, sigma_range=(0, 10), gray_prob=0):
+    sigma = np.random.uniform(sigma_range[0], sigma_range[1])
+    if np.random.uniform() < gray_prob:
+        gray_noise = True
+    else:
+        gray_noise = False
+    return generate_gaussian_noise(img, sigma, gray_noise)
+
+
+def random_add_gaussian_noise(img, sigma_range=(0, 1.0), gray_prob=0, clip=True, rounds=False):
+    noise = random_generate_gaussian_noise(img, sigma_range, gray_prob)
+    out = img + noise
+    if clip and rounds:
+        out = np.clip((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = np.clip(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+def random_generate_gaussian_noise_pt(img, sigma_range=(0, 10), gray_prob=0):
+    sigma = torch.rand(
+        img.size(0), dtype=img.dtype, device=img.device) * (sigma_range[1] - sigma_range[0]) + sigma_range[0]
+    gray_noise = torch.rand(img.size(0), dtype=img.dtype, device=img.device)
+    gray_noise = (gray_noise < gray_prob).float()
+    return generate_gaussian_noise_pt(img, sigma, gray_noise)
+
+
+def random_add_gaussian_noise_pt(img, sigma_range=(0, 1.0), gray_prob=0, clip=True, rounds=False):
+    noise = random_generate_gaussian_noise_pt(img, sigma_range, gray_prob)
+    out = img + noise
+    if clip and rounds:
+        out = torch.clamp((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = torch.clamp(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+# ----------------------- Poisson (Shot) Noise ----------------------- #
+
+
+def generate_poisson_noise(img, scale=1.0, gray_noise=False):
+    """Generate poisson noise.
+
+    Reference: https://github.com/scikit-image/scikit-image/blob/main/skimage/util/noise.py#L37-L219
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        scale (float): Noise scale. Default: 1.0.
+        gray_noise (bool): Whether generate gray noise. Default: False.
+
+    Returns:
+        (Numpy array): Returned noisy image, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    if gray_noise:
+        img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
+    # round and clip image for counting vals correctly
+    img = np.clip((img * 255.0).round(), 0, 255) / 255.
+    vals = len(np.unique(img))
+    vals = 2**np.ceil(np.log2(vals))
+    out = np.float32(np.random.poisson(img * vals) / float(vals))
+    noise = out - img
+    if gray_noise:
+        noise = np.repeat(noise[:, :, np.newaxis], 3, axis=2)
+    return noise * scale
+
+
+def add_poisson_noise(img, scale=1.0, clip=True, rounds=False, gray_noise=False):
+    """Add poisson noise.
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        scale (float): Noise scale. Default: 1.0.
+        gray_noise (bool): Whether generate gray noise. Default: False.
+
+    Returns:
+        (Numpy array): Returned noisy image, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    noise = generate_poisson_noise(img, scale, gray_noise)
+    out = img + noise
+    if clip and rounds:
+        out = np.clip((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = np.clip(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+def generate_poisson_noise_pt(img, scale=1.0, gray_noise=0):
+    """Generate a batch of poisson noise (PyTorch version)
+
+    Args:
+        img (Tensor): Input image, shape (b, c, h, w), range [0, 1], float32.
+        scale (float | Tensor): Noise scale. Number or Tensor with shape (b).
+            Default: 1.0.
+        gray_noise (float | Tensor): 0-1 number or Tensor with shape (b).
+            0 for False, 1 for True. Default: 0.
+
+    Returns:
+        (Tensor): Returned noisy image, shape (b, c, h, w), range[0, 1],
+            float32.
+    """
+    b, _, h, w = img.size()
+    if isinstance(gray_noise, (float, int)):
+        cal_gray_noise = gray_noise > 0
+    else:
+        gray_noise = gray_noise.view(b, 1, 1, 1)
+        cal_gray_noise = torch.sum(gray_noise) > 0
+    if cal_gray_noise:
+        img_gray = rgb_to_grayscale(img, num_output_channels=1)
+        # round and clip image for counting vals correctly
+        img_gray = torch.clamp((img_gray * 255.0).round(), 0, 255) / 255.
+        # use for-loop to get the unique values for each sample
+        vals_list = [len(torch.unique(img_gray[i, :, :, :])) for i in range(b)]
+        vals_list = [2**np.ceil(np.log2(vals)) for vals in vals_list]
+        vals = img_gray.new_tensor(vals_list).view(b, 1, 1, 1)
+        out = torch.poisson(img_gray * vals) / vals
+        noise_gray = out - img_gray
+        noise_gray = noise_gray.expand(b, 3, h, w)
+
+    # always calculate color noise
+    # round and clip image for counting vals correctly
+    img = torch.clamp((img * 255.0).round(), 0, 255) / 255.
+    # use for-loop to get the unique values for each sample
+    vals_list = [len(torch.unique(img[i, :, :, :])) for i in range(b)]
+    vals_list = [2**np.ceil(np.log2(vals)) for vals in vals_list]
+    vals = img.new_tensor(vals_list).view(b, 1, 1, 1)
+    out = torch.poisson(img * vals) / vals
+    noise = out - img
+    if cal_gray_noise:
+        noise = noise * (1 - gray_noise) + noise_gray * gray_noise
+    if not isinstance(scale, (float, int)):
+        scale = scale.view(b, 1, 1, 1)
+    return noise * scale
+
+
+def add_poisson_noise_pt(img, scale=1.0, clip=True, rounds=False, gray_noise=0):
+    """Add poisson noise to a batch of images (PyTorch version).
+
+    Args:
+        img (Tensor): Input image, shape (b, c, h, w), range [0, 1], float32.
+        scale (float | Tensor): Noise scale. Number or Tensor with shape (b).
+            Default: 1.0.
+        gray_noise (float | Tensor): 0-1 number or Tensor with shape (b).
+            0 for False, 1 for True. Default: 0.
+
+    Returns:
+        (Tensor): Returned noisy image, shape (b, c, h, w), range[0, 1],
+            float32.
+    """
+    noise = generate_poisson_noise_pt(img, scale, gray_noise)
+    out = img + noise
+    if clip and rounds:
+        out = torch.clamp((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = torch.clamp(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+# ----------------------- Random Poisson (Shot) Noise ----------------------- #
+
+
+def random_generate_poisson_noise(img, scale_range=(0, 1.0), gray_prob=0):
+    scale = np.random.uniform(scale_range[0], scale_range[1])
+    if np.random.uniform() < gray_prob:
+        gray_noise = True
+    else:
+        gray_noise = False
+    return generate_poisson_noise(img, scale, gray_noise)
+
+
+def random_add_poisson_noise(img, scale_range=(0, 1.0), gray_prob=0, clip=True, rounds=False):
+    noise = random_generate_poisson_noise(img, scale_range, gray_prob)
+    out = img + noise
+    if clip and rounds:
+        out = np.clip((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = np.clip(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+def random_generate_poisson_noise_pt(img, scale_range=(0, 1.0), gray_prob=0):
+    scale = torch.rand(
+        img.size(0), dtype=img.dtype, device=img.device) * (scale_range[1] - scale_range[0]) + scale_range[0]
+    gray_noise = torch.rand(img.size(0), dtype=img.dtype, device=img.device)
+    gray_noise = (gray_noise < gray_prob).float()
+    return generate_poisson_noise_pt(img, scale, gray_noise)
+
+
+def random_add_poisson_noise_pt(img, scale_range=(0, 1.0), gray_prob=0, clip=True, rounds=False):
+    noise = random_generate_poisson_noise_pt(img, scale_range, gray_prob)
+    out = img + noise
+    if clip and rounds:
+        out = torch.clamp((out * 255.0).round(), 0, 255) / 255.
+    elif clip:
+        out = torch.clamp(out, 0, 1)
+    elif rounds:
+        out = (out * 255.0).round() / 255.
+    return out
+
+
+# ------------------------------------------------------------------------ #
+# --------------------------- JPEG compression --------------------------- #
+# ------------------------------------------------------------------------ #
+
+
+def add_jpg_compression(img, quality=90):
+    """Add JPG compression artifacts.
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        quality (float): JPG compression quality. 0 for lowest quality, 100 for
+            best quality. Default: 90.
+
+    Returns:
+        (Numpy array): Returned image after JPG, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    img = np.clip(img, 0, 1)
+    encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), int(quality)]
+    _, encimg = cv2.imencode('.jpg', img * 255., encode_param)
+    img = np.float32(cv2.imdecode(encimg, 1)) / 255.
+    return img
+
+
+def random_add_jpg_compression(img, quality_range=(90, 100)):
+    """Randomly add JPG compression artifacts.
+
+    Args:
+        img (Numpy array): Input image, shape (h, w, c), range [0, 1], float32.
+        quality_range (tuple[float] | list[float]): JPG compression quality
+            range. 0 for lowest quality, 100 for best quality.
+            Default: (90, 100).
+
+    Returns:
+        (Numpy array): Returned image after JPG, shape (h, w, c), range[0, 1],
+            float32.
+    """
+    quality = np.random.uniform(quality_range[0], quality_range[1])
+    return add_jpg_compression(img, quality)

basicsr/data/ffhq_dataset.py

@@ -0,0 +1,80 @@
+import random
+import time
+from os import path as osp
+from torch.utils import data as data
+from torchvision.transforms.functional import normalize
+
+from basicsr.data.transforms import augment
+from basicsr.utils import FileClient, get_root_logger, imfrombytes, img2tensor
+from basicsr.utils.registry import DATASET_REGISTRY
+
+
+@DATASET_REGISTRY.register()
+class FFHQDataset(data.Dataset):
+    """FFHQ dataset for StyleGAN.
+
+    Args:
+        opt (dict): Config for train datasets. It contains the following keys:
+            dataroot_gt (str): Data root path for gt.
+            io_backend (dict): IO backend type and other kwarg.
+            mean (list | tuple): Image mean.
+            std (list | tuple): Image std.
+            use_hflip (bool): Whether to horizontally flip.
+
+    """
+
+    def __init__(self, opt):
+        super(FFHQDataset, self).__init__()
+        self.opt = opt
+        # file client (io backend)
+        self.file_client = None
+        self.io_backend_opt = opt['io_backend']
+
+        self.gt_folder = opt['dataroot_gt']
+        self.mean = opt['mean']
+        self.std = opt['std']
+
+        if self.io_backend_opt['type'] == 'lmdb':
+            self.io_backend_opt['db_paths'] = self.gt_folder
+            if not self.gt_folder.endswith('.lmdb'):
+                raise ValueError("'dataroot_gt' should end with '.lmdb', but received {self.gt_folder}")
+            with open(osp.join(self.gt_folder, 'meta_info.txt')) as fin:
+                self.paths = [line.split('.')[0] for line in fin]
+        else:
+            # FFHQ has 70000 images in total
+            self.paths = [osp.join(self.gt_folder, f'{v:08d}.png') for v in range(70000)]
+
+    def __getitem__(self, index):
+        if self.file_client is None:
+            self.file_client = FileClient(self.io_backend_opt.pop('type'), **self.io_backend_opt)
+
+        # load gt image
+        gt_path = self.paths[index]
+        # avoid errors caused by high latency in reading files
+        retry = 3
+        while retry > 0:
+            try:
+                img_bytes = self.file_client.get(gt_path)
+            except Exception as e:
+                logger = get_root_logger()
+                logger.warning(f'File client error: {e}, remaining retry times: {retry - 1}')
+                # change another file to read
+                index = random.randint(0, self.__len__())
+                gt_path = self.paths[index]
+                time.sleep(1)  # sleep 1s for occasional server congestion
+            else:
+                break
+            finally:
+                retry -= 1
+        img_gt = imfrombytes(img_bytes, float32=True)
+
+        # random horizontal flip
+        img_gt = augment(img_gt, hflip=self.opt['use_hflip'], rotation=False)
+        # BGR to RGB, HWC to CHW, numpy to tensor
+        img_gt = img2tensor(img_gt, bgr2rgb=True, float32=True)
+        # normalize
+        normalize(img_gt, self.mean, self.std, inplace=True)
+        return {'gt': img_gt, 'gt_path': gt_path}
+
+    def __len__(self):
+        return len(self.paths)

basicsr/data/meta_info/meta_info_REDS4_test_GT.txt

@@ -0,0 +1,4 @@
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+011 100 (720,1280,3)
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basicsr/data/meta_info/meta_info_REDS_GT.txt

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basicsr/data/meta_info/meta_info_REDSofficial4_test_GT.txt

@@ -0,0 +1,4 @@
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basicsr/data/meta_info/meta_info_REDSval_official_test_GT.txt

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basicsr/data/paired_image_dataset.py

@@ -0,0 +1,106 @@
+from torch.utils import data as data
+from torchvision.transforms.functional import normalize
+
+from basicsr.data.data_util import paired_paths_from_folder, paired_paths_from_lmdb, paired_paths_from_meta_info_file
+from basicsr.data.transforms import augment, paired_random_crop
+from basicsr.utils import FileClient, bgr2ycbcr, imfrombytes, img2tensor
+from basicsr.utils.registry import DATASET_REGISTRY
+
+
+@DATASET_REGISTRY.register()
+class PairedImageDataset(data.Dataset):
+    """Paired image dataset for image restoration.
+
+    Read LQ (Low Quality, e.g. LR (Low Resolution), blurry, noisy, etc) and GT image pairs.
+
+    There are three modes:
+
+    1. **lmdb**: Use lmdb files. If opt['io_backend'] == lmdb.
+    2. **meta_info_file**: Use meta information file to generate paths. \
+        If opt['io_backend'] != lmdb and opt['meta_info_file'] is not None.
+    3. **folder**: Scan folders to generate paths. The rest.
+
+    Args:
+        opt (dict): Config for train datasets. It contains the following keys:
+        dataroot_gt (str): Data root path for gt.
+        dataroot_lq (str): Data root path for lq.
+        meta_info_file (str): Path for meta information file.
+        io_backend (dict): IO backend type and other kwarg.
+        filename_tmpl (str): Template for each filename. Note that the template excludes the file extension.
+            Default: '{}'.
+        gt_size (int): Cropped patched size for gt patches.
+        use_hflip (bool): Use horizontal flips.
+        use_rot (bool): Use rotation (use vertical flip and transposing h and w for implementation).
+        scale (bool): Scale, which will be added automatically.
+        phase (str): 'train' or 'val'.
+    """
+
+    def __init__(self, opt):
+        super(PairedImageDataset, self).__init__()
+        self.opt = opt
+        # file client (io backend)
+        self.file_client = None
+        self.io_backend_opt = opt['io_backend']
+        self.mean = opt['mean'] if 'mean' in opt else None
+        self.std = opt['std'] if 'std' in opt else None
+
+        self.gt_folder, self.lq_folder = opt['dataroot_gt'], opt['dataroot_lq']
+        if 'filename_tmpl' in opt:
+            self.filename_tmpl = opt['filename_tmpl']
+        else:
+            self.filename_tmpl = '{}'
+
+        if self.io_backend_opt['type'] == 'lmdb':
+            self.io_backend_opt['db_paths'] = [self.lq_folder, self.gt_folder]
+            self.io_backend_opt['client_keys'] = ['lq', 'gt']
+            self.paths = paired_paths_from_lmdb([self.lq_folder, self.gt_folder], ['lq', 'gt'])
+        elif 'meta_info_file' in self.opt and self.opt['meta_info_file'] is not None:
+            self.paths = paired_paths_from_meta_info_file([self.lq_folder, self.gt_folder], ['lq', 'gt'],
+                                                          self.opt['meta_info_file'], self.filename_tmpl)
+        else:
+            self.paths = paired_paths_from_folder([self.lq_folder, self.gt_folder], ['lq', 'gt'], self.filename_tmpl)
+
+    def __getitem__(self, index):
+        if self.file_client is None:
+            self.file_client = FileClient(self.io_backend_opt.pop('type'), **self.io_backend_opt)
+
+        scale = self.opt['scale']
+
+        # Load gt and lq images. Dimension order: HWC; channel order: BGR;
+        # image range: [0, 1], float32.
+        gt_path = self.paths[index]['gt_path']
+        img_bytes = self.file_client.get(gt_path, 'gt')
+        img_gt = imfrombytes(img_bytes, float32=True)
+        lq_path = self.paths[index]['lq_path']
+        img_bytes = self.file_client.get(lq_path, 'lq')
+        img_lq = imfrombytes(img_bytes, float32=True)
+
+        # augmentation for training
+        if self.opt['phase'] == 'train':
+            gt_size = self.opt['gt_size']
+            # random crop
+            img_gt, img_lq = paired_random_crop(img_gt, img_lq, gt_size, scale, gt_path)
+            # flip, rotation
+            img_gt, img_lq = augment([img_gt, img_lq], self.opt['use_hflip'], self.opt['use_rot'])
+
+        # color space transform
+        if 'color' in self.opt and self.opt['color'] == 'y':
+            img_gt = bgr2ycbcr(img_gt, y_only=True)[..., None]
+            img_lq = bgr2ycbcr(img_lq, y_only=True)[..., None]
+
+        # crop the unmatched GT images during validation or testing, especially for SR benchmark datasets
+        # TODO: It is better to update the datasets, rather than force to crop
+        if self.opt['phase'] != 'train':
+            img_gt = img_gt[0:img_lq.shape[0] * scale, 0:img_lq.shape[1] * scale, :]
+
+        # BGR to RGB, HWC to CHW, numpy to tensor
+        img_gt, img_lq = img2tensor([img_gt, img_lq], bgr2rgb=True, float32=True)
+        # normalize
+        if self.mean is not None or self.std is not None:
+            normalize(img_lq, self.mean, self.std, inplace=True)
+            normalize(img_gt, self.mean, self.std, inplace=True)
+
+        return {'lq': img_lq, 'gt': img_gt, 'lq_path': lq_path, 'gt_path': gt_path}
+
+    def __len__(self):
+        return len(self.paths)

basicsr/data/prefetch_dataloader.py

@@ -0,0 +1,122 @@
+import queue as Queue
+import threading
+import torch
+from torch.utils.data import DataLoader
+
+
+class PrefetchGenerator(threading.Thread):
+    """A general prefetch generator.
+
+    Reference: https://stackoverflow.com/questions/7323664/python-generator-pre-fetch
+
+    Args:
+        generator: Python generator.
+        num_prefetch_queue (int): Number of prefetch queue.
+    """
+
+    def __init__(self, generator, num_prefetch_queue):
+        threading.Thread.__init__(self)
+        self.queue = Queue.Queue(num_prefetch_queue)
+        self.generator = generator
+        self.daemon = True
+        self.start()
+
+    def run(self):
+        for item in self.generator:
+            self.queue.put(item)
+        self.queue.put(None)
+
+    def __next__(self):
+        next_item = self.queue.get()
+        if next_item is None:
+            raise StopIteration
+        return next_item
+
+    def __iter__(self):
+        return self
+
+
+class PrefetchDataLoader(DataLoader):
+    """Prefetch version of dataloader.
+
+    Reference: https://github.com/IgorSusmelj/pytorch-styleguide/issues/5#
+
+    TODO:
+    Need to test on single gpu and ddp (multi-gpu). There is a known issue in
+    ddp.
+
+    Args:
+        num_prefetch_queue (int): Number of prefetch queue.
+        kwargs (dict): Other arguments for dataloader.
+    """
+
+    def __init__(self, num_prefetch_queue, **kwargs):
+        self.num_prefetch_queue = num_prefetch_queue
+        super(PrefetchDataLoader, self).__init__(**kwargs)
+
+    def __iter__(self):
+        return PrefetchGenerator(super().__iter__(), self.num_prefetch_queue)
+
+
+class CPUPrefetcher():
+    """CPU prefetcher.
+
+    Args:
+        loader: Dataloader.
+    """
+
+    def __init__(self, loader):
+        self.ori_loader = loader
+        self.loader = iter(loader)
+
+    def next(self):
+        try:
+            return next(self.loader)
+        except StopIteration:
+            return None
+
+    def reset(self):
+        self.loader = iter(self.ori_loader)
+
+
+class CUDAPrefetcher():
+    """CUDA prefetcher.
+
+    Reference: https://github.com/NVIDIA/apex/issues/304#
+
+    It may consume more GPU memory.
+
+    Args:
+        loader: Dataloader.
+        opt (dict): Options.
+    """
+
+    def __init__(self, loader, opt):
+        self.ori_loader = loader
+        self.loader = iter(loader)
+        self.opt = opt
+        self.stream = torch.cuda.Stream()
+        self.device = torch.device('cuda' if opt['num_gpu'] != 0 else 'cpu')
+        self.preload()
+
+    def preload(self):
+        try:
+            self.batch = next(self.loader)  # self.batch is a dict
+        except StopIteration:
+            self.batch = None
+            return None
+        # put tensors to gpu
+        with torch.cuda.stream(self.stream):
+            for k, v in self.batch.items():
+                if torch.is_tensor(v):
+                    self.batch[k] = self.batch[k].to(device=self.device, non_blocking=True)
+
+    def next(self):
+        torch.cuda.current_stream().wait_stream(self.stream)
+        batch = self.batch
+        self.preload()
+        return batch
+
+    def reset(self):
+        self.loader = iter(self.ori_loader)
+        self.preload()

basicsr/data/realesrgan_dataset.py

@@ -0,0 +1,384 @@
+import cv2
+import math
+import numpy as np
+import os
+import os.path as osp
+import random
+import time
+import torch
+from pathlib import Path
+
+import albumentations
+
+import torch.nn.functional as F
+from torch.utils import data as data
+
+from basicsr.utils import DiffJPEG
+from basicsr.data.degradations import circular_lowpass_kernel, random_mixed_kernels
+from basicsr.data.transforms import augment
+from basicsr.utils import FileClient, get_root_logger, imfrombytes, img2tensor
+from basicsr.utils.registry import DATASET_REGISTRY
+from basicsr.utils.img_process_util import filter2D
+from basicsr.data.transforms import paired_random_crop, random_crop
+from basicsr.data.degradations import random_add_gaussian_noise_pt, random_add_poisson_noise_pt
+
+from utils import util_image
+
+def readline_txt(txt_file):
+    txt_file = [txt_file, ] if isinstance(txt_file, str) else txt_file
+    out = []
+    for txt_file_current in txt_file:
+        with open(txt_file_current, 'r') as ff:
+            out.extend([x[:-1] for x in ff.readlines()])
+
+    return out
+
+@DATASET_REGISTRY.register(suffix='basicsr')
+class RealESRGANDataset(data.Dataset):
+    """Dataset used for Real-ESRGAN model:
+    Real-ESRGAN: Training Real-World Blind Super-Resolution with Pure Synthetic Data.
+
+    It loads gt (Ground-Truth) images, and augments them.
+    It also generates blur kernels and sinc kernels for generating low-quality images.
+    Note that the low-quality images are processed in tensors on GPUS for faster processing.
+
+    Args:
+        opt (dict): Config for train datasets. It contains the following keys:
+            dataroot_gt (str): Data root path for gt.
+            meta_info (str): Path for meta information file.
+            io_backend (dict): IO backend type and other kwarg.
+            use_hflip (bool): Use horizontal flips.
+            use_rot (bool): Use rotation (use vertical flip and transposing h and w for implementation).
+            Please see more options in the codes.
+    """
+
+    def __init__(self, opt, mode='training'):
+        super(RealESRGANDataset, self).__init__()
+        self.opt = opt
+        self.file_client = None
+        self.io_backend_opt = opt['io_backend']
+
+        # file client (lmdb io backend)
+        self.image_paths = []
+        self.text_paths = []
+        self.moment_paths = []
+        if opt.get('data_source', None) is not None:
+            for ii in range(len(opt['data_source'])):
+                configs = opt['data_source'].get(f'source{ii+1}')
+                root_path = Path(configs.root_path)
+                im_folder = root_path / configs.image_path
+                im_ext = configs.im_ext
+                image_stems = sorted([x.stem for x in im_folder.glob(f"*.{im_ext}")])
+                if configs.get('length', None) is not None:
+                    assert configs.length < len(image_stems)
+                    image_stems = image_stems[:configs.length]
+
+                if configs.get("text_path", None) is not None:
+                    text_folder = root_path / configs.text_path
+                    text_stems = [x.stem for x in text_folder.glob("*.txt")]
+                    image_stems = sorted(list(set(image_stems).intersection(set(text_stems))))
+                    self.text_paths.extend([str(text_folder / f"{x}.txt") for x in image_stems])
+                else:
+                    self.text_paths.extend([None, ] * len(image_stems))
+
+                self.image_paths.extend([str(im_folder / f"{x}.{im_ext}") for x in image_stems])
+
+                if configs.get("moment_path", None) is not None:
+                    moment_folder = root_path / configs.moment_path
+                    self.moment_paths.extend([str(moment_folder / f"{x}.npy") for x in image_stems])
+                else:
+                    self.moment_paths.extend([None, ] * len(image_stems))
+
+        # blur settings for the first degradation
+        self.blur_kernel_size = opt['blur_kernel_size']
+        self.kernel_list = opt['kernel_list']
+        self.kernel_prob = opt['kernel_prob']  # a list for each kernel probability
+        self.blur_sigma = opt['blur_sigma']
+        self.betag_range = opt['betag_range']  # betag used in generalized Gaussian blur kernels
+        self.betap_range = opt['betap_range']  # betap used in plateau blur kernels
+        self.sinc_prob = opt['sinc_prob']  # the probability for sinc filters
+
+        # blur settings for the second degradation
+        self.blur_kernel_size2 = opt['blur_kernel_size2']
+        self.kernel_list2 = opt['kernel_list2']
+        self.kernel_prob2 = opt['kernel_prob2']
+        self.blur_sigma2 = opt['blur_sigma2']
+        self.betag_range2 = opt['betag_range2']
+        self.betap_range2 = opt['betap_range2']
+        self.sinc_prob2 = opt['sinc_prob2']
+
+        # a final sinc filter
+        self.final_sinc_prob = opt['final_sinc_prob']
+
+        self.kernel_range1 = [x for x in range(3, opt['blur_kernel_size'], 2)]  # kernel size ranges from 7 to 21
+        self.kernel_range2 = [x for x in range(3, opt['blur_kernel_size2'], 2)]  # kernel size ranges from 7 to 21
+        # TODO: kernel range is now hard-coded, should be in the configure file
+        # convolving with pulse tensor brings no blurry effect
+        self.pulse_tensor = torch.zeros(opt['blur_kernel_size2'], opt['blur_kernel_size2']).float()
+        self.pulse_tensor[opt['blur_kernel_size2']//2, opt['blur_kernel_size2']//2] = 1
+
+        self.mode = mode
+
+    def __getitem__(self, index):
+        if self.file_client is None:
+            self.file_client = FileClient(self.io_backend_opt.pop('type'), **self.io_backend_opt)
+
+        # -------------------------------- Load gt images -------------------------------- #
+        # Shape: (h, w, c); channel order: BGR; image range: [0, 1], float32.
+        gt_path = self.image_paths[index]
+        # avoid errors caused by high latency in reading files
+        retry = 3
+        while retry > 0:
+            try:
+                img_bytes = self.file_client.get(gt_path, 'gt')
+                img_gt = imfrombytes(img_bytes, float32=True)
+            except:
+                index = random.randint(0, self.__len__())
+                gt_path = self.image_paths[index]
+                time.sleep(1)  # sleep 1s for occasional server congestion
+            finally:
+                retry -= 1
+        if self.mode == 'testing':
+            if not hasattr(self, 'test_aug'):
+                self.test_aug = albumentations.Compose([
+                    albumentations.SmallestMaxSize(
+                        max_size=self.opt['gt_size'],
+                        interpolation=cv2.INTER_AREA,
+                        ),
+                    albumentations.CenterCrop(self.opt['gt_size'], self.opt['gt_size']),
+                    ])
+            img_gt = self.test_aug(image=img_gt)['image']
+        elif self.mode == 'training':
+            # -------------------- Do augmentation for training: flip, rotation -------------------- #
+            if self.opt['use_hflip'] or self.opt['use_rot']:
+                img_gt = augment(img_gt, self.opt['use_hflip'], self.opt['use_rot'])
+
+            h, w = img_gt.shape[0:2]
+            gt_size = self.opt['gt_size']
+
+            # resize or pad
+            if not self.opt['random_crop']:
+                if not min(h, w) == gt_size:
+                    if not hasattr(self, 'smallest_resizer'):
+                        self.smallest_resizer = util_image.SmallestMaxSize(
+                            max_size=gt_size, pass_resize=False,
+                        )
+                    img_gt = self.smallest_resizer(img_gt)
+
+                # center crop
+                if not hasattr(self, 'center_cropper'):
+                    self.center_cropper = albumentations.CenterCrop(gt_size, gt_size)
+                img_gt = self.center_cropper(image=img_gt)['image']
+            else:
+                img_gt = random_crop(img_gt, self.opt['gt_size'])
+        else:
+            raise ValueError(f'Unexpected value {self.mode} for mode parameter')
+
+        # ------------------------ Generate kernels (used in the first degradation) ------------------------ #
+        kernel_size = random.choice(self.kernel_range1)
+        if np.random.uniform() < self.opt['sinc_prob']:
+            # this sinc filter setting is for kernels ranging from [7, 21]
+            if kernel_size < 13:
+                omega_c = np.random.uniform(np.pi / 3, np.pi)
+            else:
+                omega_c = np.random.uniform(np.pi / 5, np.pi)
+            kernel = circular_lowpass_kernel(omega_c, kernel_size, pad_to=False)
+        else:
+            kernel = random_mixed_kernels(
+                self.kernel_list,
+                self.kernel_prob,
+                kernel_size,
+                self.blur_sigma,
+                self.blur_sigma, [-math.pi, math.pi],
+                self.betag_range,
+                self.betap_range,
+                noise_range=None)
+        # pad kernel
+        pad_size = (self.blur_kernel_size - kernel_size) // 2
+        kernel = np.pad(kernel, ((pad_size, pad_size), (pad_size, pad_size)))
+
+        # ------------------------ Generate kernels (used in the second degradation) ------------------------ #
+        kernel_size = random.choice(self.kernel_range2)
+        if np.random.uniform() < self.opt['sinc_prob2']:
+            if kernel_size < 13:
+                omega_c = np.random.uniform(np.pi / 3, np.pi)
+            else:
+                omega_c = np.random.uniform(np.pi / 5, np.pi)
+            kernel2 = circular_lowpass_kernel(omega_c, kernel_size, pad_to=False)
+        else:
+            kernel2 = random_mixed_kernels(
+                self.kernel_list2,
+                self.kernel_prob2,
+                kernel_size,
+                self.blur_sigma2,
+                self.blur_sigma2, [-math.pi, math.pi],
+                self.betag_range2,
+                self.betap_range2,
+                noise_range=None)
+
+        # pad kernel
+        pad_size = (self.blur_kernel_size2 - kernel_size) // 2
+        kernel2 = np.pad(kernel2, ((pad_size, pad_size), (pad_size, pad_size)))
+
+        # ------------------------------------- the final sinc kernel ------------------------------------- #
+        if np.random.uniform() < self.opt['final_sinc_prob']:
+            kernel_size = random.choice(self.kernel_range2)
+            omega_c = np.random.uniform(np.pi / 3, np.pi)
+            sinc_kernel = circular_lowpass_kernel(omega_c, kernel_size, pad_to=self.blur_kernel_size2)
+            sinc_kernel = torch.FloatTensor(sinc_kernel)
+        else:
+            sinc_kernel = self.pulse_tensor
+
+        # BGR to RGB, HWC to CHW, numpy to tensor
+        img_gt = img2tensor([img_gt], bgr2rgb=True, float32=True)[0]
+        kernel = torch.FloatTensor(kernel)
+        kernel2 = torch.FloatTensor(kernel2)
+
+        if self.text_paths[index] is None or self.opt['random_crop']:
+            prompt = ""
+        else:
+            with open(self.text_paths[index], 'r') as ff:
+                prompt = ff.read()
+            if self.opt.max_token_length is not None:
+                prompt = prompt[:self.opt.max_token_length]
+
+        return_d = {
+                'gt': img_gt,
+                'gt_path': gt_path,
+                'txt': prompt,
+                'kernel1': kernel,
+                'kernel2': kernel2,
+                'sinc_kernel': sinc_kernel,
+                }
+        if self.moment_paths[index] is not None and (not self.opt['random_crop']):
+            return_d['gt_moment'] = np.load(self.moment_paths[index])
+
+        return return_d
+
+    def __len__(self):
+        return len(self.image_paths)
+
+    def degrade_fun(self, conf_degradation, im_gt, kernel1, kernel2, sinc_kernel):
+        if not hasattr(self, 'jpeger'):
+            self.jpeger = DiffJPEG(differentiable=False)  # simulate JPEG compression artifacts
+
+        ori_h, ori_w = im_gt.size()[2:4]
+        sf = conf_degradation.sf
+
+        # ----------------------- The first degradation process ----------------------- #
+        # blur
+        out = filter2D(im_gt, kernel1)
+        # random resize
+        updown_type = random.choices(
+                ['up', 'down', 'keep'],
+                conf_degradation['resize_prob'],
+                )[0]
+        if updown_type == 'up':
+            scale = random.uniform(1, conf_degradation['resize_range'][1])
+        elif updown_type == 'down':
+            scale = random.uniform(conf_degradation['resize_range'][0], 1)
+        else:
+            scale = 1
+        mode = random.choice(['area', 'bilinear', 'bicubic'])
+        out = F.interpolate(out, scale_factor=scale, mode=mode)
+        # add noise
+        gray_noise_prob = conf_degradation['gray_noise_prob']
+        if random.random() < conf_degradation['gaussian_noise_prob']:
+            out = random_add_gaussian_noise_pt(
+                out,
+                sigma_range=conf_degradation['noise_range'],
+                clip=True,
+                rounds=False,
+                gray_prob=gray_noise_prob,
+                )
+        else:
+            out = random_add_poisson_noise_pt(
+                out,
+                scale_range=conf_degradation['poisson_scale_range'],
+                gray_prob=gray_noise_prob,
+                clip=True,
+                rounds=False)
+        # JPEG compression
+        jpeg_p = out.new_zeros(out.size(0)).uniform_(*conf_degradation['jpeg_range'])
+        out = torch.clamp(out, 0, 1)  # clamp to [0, 1], otherwise JPEGer will result in unpleasant artifacts
+        out = self.jpeger(out, quality=jpeg_p)
+
+        # ----------------------- The second degradation process ----------------------- #
+        # blur
+        if random.random() < conf_degradation['second_order_prob']:
+            if random.random() < conf_degradation['second_blur_prob']:
+                out = filter2D(out, kernel2)
+            # random resize
+            updown_type = random.choices(
+                    ['up', 'down', 'keep'],
+                    conf_degradation['resize_prob2'],
+                    )[0]
+            if updown_type == 'up':
+                scale = random.uniform(1, conf_degradation['resize_range2'][1])
+            elif updown_type == 'down':
+                scale = random.uniform(conf_degradation['resize_range2'][0], 1)
+            else:
+                scale = 1
+            mode = random.choice(['area', 'bilinear', 'bicubic'])
+            out = F.interpolate(
+                    out,
+                    size=(int(ori_h / sf * scale), int(ori_w / sf * scale)),
+                    mode=mode,
+                    )
+            # add noise
+            gray_noise_prob = conf_degradation['gray_noise_prob2']
+            if random.random() < conf_degradation['gaussian_noise_prob2']:
+                out = random_add_gaussian_noise_pt(
+                    out,
+                    sigma_range=conf_degradation['noise_range2'],
+                    clip=True,
+                    rounds=False,
+                    gray_prob=gray_noise_prob,
+                    )
+            else:
+                out = random_add_poisson_noise_pt(
+                    out,
+                    scale_range=conf_degradation['poisson_scale_range2'],
+                    gray_prob=gray_noise_prob,
+                    clip=True,
+                    rounds=False,
+                    )
+
+        # JPEG compression + the final sinc filter
+        # We also need to resize images to desired sizes. We group [resize back + sinc filter] together
+        # as one operation.
+        # We consider two orders:
+        #   1. [resize back + sinc filter] + JPEG compression
+        #   2. JPEG compression + [resize back + sinc filter]
+        # Empirically, we find other combinations (sinc + JPEG + Resize) will introduce twisted lines.
+        if random.random() < 0.5:
+            # resize back + the final sinc filter
+            mode = random.choice(['area', 'bilinear', 'bicubic'])
+            out = F.interpolate(
+                    out,
+                    size=(ori_h // sf, ori_w // sf),
+                    mode=mode,
+                    )
+            out = filter2D(out, sinc_kernel)
+            # JPEG compression
+            jpeg_p = out.new_zeros(out.size(0)).uniform_(*conf_degradation['jpeg_range2'])
+            out = torch.clamp(out, 0, 1)
+            out = self.jpeger(out, quality=jpeg_p)
+        else:
+            # JPEG compression
+            jpeg_p = out.new_zeros(out.size(0)).uniform_(*conf_degradation['jpeg_range2'])
+            out = torch.clamp(out, 0, 1)
+            out = self.jpeger(out, quality=jpeg_p)
+            # resize back + the final sinc filter
+            mode = random.choice(['area', 'bilinear', 'bicubic'])
+            out = F.interpolate(
+                    out,
+                    size=(ori_h // sf, ori_w // sf),
+                    mode=mode,
+                    )
+            out = filter2D(out, sinc_kernel)
+
+        # clamp and round
+        im_lq = torch.clamp((out * 255.0).round(), 0, 255) / 255.
+
+        return {'lq':im_lq.contiguous(), 'gt':im_gt}