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""" Quick n Simple Image Folder, Tarfile based DataSet
Hacked together by / Copyright 2020 Ross Wightman
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import torch.utils.data as data
import os
import re
import torch
import tarfile
from PIL import Image
IMG_EXTENSIONS = ['.png', '.jpg', '.jpeg']
def natural_key(string_):
"""See http://www.codinghorror.com/blog/archives/001018.html"""
return [int(s) if s.isdigit() else s for s in re.split(r'(\d+)', string_.lower())]
def find_images_and_targets(folder, types=IMG_EXTENSIONS, class_to_idx=None, leaf_name_only=True, sort=True):
labels = []
filenames = []
for root, subdirs, files in os.walk(folder, topdown=False):
rel_path = os.path.relpath(root, folder) if (root != folder) else ''
label = os.path.basename(rel_path) if leaf_name_only else rel_path.replace(os.path.sep, '_')
for f in files:
base, ext = os.path.splitext(f)
if ext.lower() in types:
filenames.append(os.path.join(root, f))
labels.append(label)
if class_to_idx is None:
# building class index
unique_labels = set(labels)
sorted_labels = list(sorted(unique_labels, key=natural_key))
class_to_idx = {c: idx for idx, c in enumerate(sorted_labels)}
images_and_targets = [(f, class_to_idx[l]) for f, l in zip(filenames, labels) if l in class_to_idx]
if sort:
images_and_targets = sorted(images_and_targets, key=lambda k: natural_key(k[0]))
return images_and_targets, class_to_idx
def load_class_map(filename, root=''):
class_map_path = filename
if not os.path.exists(class_map_path):
class_map_path = os.path.join(root, filename)
assert os.path.exists(class_map_path), 'Cannot locate specified class map file (%s)' % filename
class_map_ext = os.path.splitext(filename)[-1].lower()
if class_map_ext == '.txt':
with open(class_map_path) as f:
class_to_idx = {v.strip(): k for k, v in enumerate(f)}
else:
assert False, 'Unsupported class map extension'
return class_to_idx
class Dataset(data.Dataset):
def __init__(
self,
root,
load_bytes=False,
transform=None,
class_map=''):
class_to_idx = None
if class_map:
class_to_idx = load_class_map(class_map, root)
images, class_to_idx = find_images_and_targets(root, class_to_idx=class_to_idx)
if len(images) == 0:
raise RuntimeError(f'Found 0 images in subfolders of {root}. '
f'Supported image extensions are {", ".join(IMG_EXTENSIONS)}')
self.root = root
self.samples = images
self.imgs = self.samples # torchvision ImageFolder compat
self.class_to_idx = class_to_idx
self.load_bytes = load_bytes
self.transform = transform
def __getitem__(self, index):
path, target = self.samples[index]
img = open(path, 'rb').read() if self.load_bytes else Image.open(path).convert('RGB')
if self.transform is not None:
img = self.transform(img)
if target is None:
target = torch.zeros(1).long()
return img, target
def __len__(self):
return len(self.samples)
def filename(self, index, basename=False, absolute=False):
filename = self.samples[index][0]
if basename:
filename = os.path.basename(filename)
elif not absolute:
filename = os.path.relpath(filename, self.root)
return filename
def filenames(self, basename=False, absolute=False):
fn = lambda x: x
if basename:
fn = os.path.basename
elif not absolute:
fn = lambda x: os.path.relpath(x, self.root)
return [fn(x[0]) for x in self.samples]
def _extract_tar_info(tarfile, class_to_idx=None, sort=True):
files = []
labels = []
for ti in tarfile.getmembers():
if not ti.isfile():
continue
dirname, basename = os.path.split(ti.path)
label = os.path.basename(dirname)
ext = os.path.splitext(basename)[1]
if ext.lower() in IMG_EXTENSIONS:
files.append(ti)
labels.append(label)
if class_to_idx is None:
unique_labels = set(labels)
sorted_labels = list(sorted(unique_labels, key=natural_key))
class_to_idx = {c: idx for idx, c in enumerate(sorted_labels)}
tarinfo_and_targets = [(f, class_to_idx[l]) for f, l in zip(files, labels) if l in class_to_idx]
if sort:
tarinfo_and_targets = sorted(tarinfo_and_targets, key=lambda k: natural_key(k[0].path))
return tarinfo_and_targets, class_to_idx
class DatasetTar(data.Dataset):
def __init__(self, root, load_bytes=False, transform=None, class_map=''):
class_to_idx = None
if class_map:
class_to_idx = load_class_map(class_map, root)
assert os.path.isfile(root)
self.root = root
with tarfile.open(root) as tf: # cannot keep this open across processes, reopen later
self.samples, self.class_to_idx = _extract_tar_info(tf, class_to_idx)
self.imgs = self.samples
self.tarfile = None # lazy init in __getitem__
self.load_bytes = load_bytes
self.transform = transform
def __getitem__(self, index):
if self.tarfile is None:
self.tarfile = tarfile.open(self.root)
tarinfo, target = self.samples[index]
iob = self.tarfile.extractfile(tarinfo)
img = iob.read() if self.load_bytes else Image.open(iob).convert('RGB')
if self.transform is not None:
img = self.transform(img)
if target is None:
target = torch.zeros(1).long()
return img, target
def __len__(self):
return len(self.samples)
def filename(self, index, basename=False):
filename = self.samples[index][0].name
if basename:
filename = os.path.basename(filename)
return filename
def filenames(self, basename=False):
fn = os.path.basename if basename else lambda x: x
return [fn(x[0].name) for x in self.samples]
class AugMixDataset(torch.utils.data.Dataset):
"""Dataset wrapper to perform AugMix or other clean/augmentation mixes"""
def __init__(self, dataset, num_splits=2):
self.augmentation = None
self.normalize = None
self.dataset = dataset
if self.dataset.transform is not None:
self._set_transforms(self.dataset.transform)
self.num_splits = num_splits
def _set_transforms(self, x):
assert isinstance(x, (list, tuple)) and len(x) == 3, 'Expecting a tuple/list of 3 transforms'
self.dataset.transform = x[0]
self.augmentation = x[1]
self.normalize = x[2]
@property
def transform(self):
return self.dataset.transform
@transform.setter
def transform(self, x):
self._set_transforms(x)
def _normalize(self, x):
return x if self.normalize is None else self.normalize(x)
def __getitem__(self, i):
x, y = self.dataset[i] # all splits share the same dataset base transform
x_list = [self._normalize(x)] # first split only normalizes (this is the 'clean' split)
# run the full augmentation on the remaining splits
for _ in range(self.num_splits - 1):
x_list.append(self._normalize(self.augmentation(x)))
return tuple(x_list), y
def __len__(self):
return len(self.dataset)
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