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106 lines
3.3 KiB
106 lines
3.3 KiB
""" Quick n Simple Image Folder, Tarfile based DataSet
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Hacked together by / Copyright 2020 Ross Wightman
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"""
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import torch.utils.data as data
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import os
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import torch
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import logging
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from PIL import Image
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from .parsers import ParserImageFolder, ParserImageTar, ParserImageClassInTar
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_logger = logging.getLogger(__name__)
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_ERROR_RETRY = 50
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class ImageDataset(data.Dataset):
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def __init__(
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self,
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root,
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parser=None,
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class_map='',
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load_bytes=False,
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transform=None,
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):
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if parser is None:
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if os.path.isfile(root) and os.path.splitext(root)[1] == '.tar':
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parser = ParserImageTar(root, class_map=class_map)
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else:
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parser = ParserImageFolder(root, class_map=class_map)
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self.parser = parser
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self.load_bytes = load_bytes
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self.transform = transform
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self._consecutive_errors = 0
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def __getitem__(self, index):
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img, target = self.parser[index]
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try:
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img = img.read() if self.load_bytes else Image.open(img).convert('RGB')
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except Exception as e:
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_logger.warning(f'Skipped sample (index {index}, file {self.parser.filename(index)}). {str(e)}')
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self._consecutive_errors += 1
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if self._consecutive_errors < _ERROR_RETRY:
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return self.__getitem__((index + 1) % len(self.parser))
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else:
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raise e
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self._consecutive_errors = 0
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if self.transform is not None:
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img = self.transform(img)
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if target is None:
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target = torch.tensor(-1, dtype=torch.long)
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return img, target
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def __len__(self):
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return len(self.parser)
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def filename(self, index, basename=False, absolute=False):
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return self.parser.filename(index, basename, absolute)
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def filenames(self, basename=False, absolute=False):
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return self.parser.filenames(basename, absolute)
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class AugMixDataset(torch.utils.data.Dataset):
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"""Dataset wrapper to perform AugMix or other clean/augmentation mixes"""
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def __init__(self, dataset, num_splits=2):
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self.augmentation = None
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self.normalize = None
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self.dataset = dataset
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if self.dataset.transform is not None:
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self._set_transforms(self.dataset.transform)
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self.num_splits = num_splits
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def _set_transforms(self, x):
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assert isinstance(x, (list, tuple)) and len(x) == 3, 'Expecting a tuple/list of 3 transforms'
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self.dataset.transform = x[0]
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self.augmentation = x[1]
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self.normalize = x[2]
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@property
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def transform(self):
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return self.dataset.transform
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@transform.setter
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def transform(self, x):
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self._set_transforms(x)
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def _normalize(self, x):
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return x if self.normalize is None else self.normalize(x)
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def __getitem__(self, i):
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x, y = self.dataset[i] # all splits share the same dataset base transform
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x_list = [self._normalize(x)] # first split only normalizes (this is the 'clean' split)
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# run the full augmentation on the remaining splits
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for _ in range(self.num_splits - 1):
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x_list.append(self._normalize(self.augmentation(x)))
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return tuple(x_list), y
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def __len__(self):
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return len(self.dataset)
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