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import torch.utils.data as data
from PIL import Image
import os
import os.path
from io import BytesIO
import lmdb
from torch.utils.data import Dataset
class MultiResolutionDataset(Dataset):
def __init__(self, path, transform, resolution=256):
self.env = lmdb.open(
path,
max_readers=32,
readonly=True,
lock=False,
readahead=False,
meminit=False,
)
if not self.env:
raise IOError('Cannot open lmdb dataset', path)
with self.env.begin(write=False) as txn:
self.length = int(txn.get('length'.encode('utf-8')).decode('utf-8'))
self.resolution = resolution
self.transform = transform
def __len__(self):
return self.length
def __getitem__(self, index):
with self.env.begin(write=False) as txn:
key = f'{self.resolution}-{str(index).zfill(5)}'.encode('utf-8')
img_bytes = txn.get(key)
buffer = BytesIO(img_bytes)
img = Image.open(buffer)
img = self.transform(img)
return img
def has_file_allowed_extension(filename, extensions):
"""Checks if a file is an allowed extension.
Args:
filename (string): path to a file
Returns:
bool: True if the filename ends with a known image extension
"""
filename_lower = filename.lower()
return any(filename_lower.endswith(ext) for ext in extensions)
def find_classes(dir):
classes = [d for d in os.listdir(dir) if os.path.isdir(os.path.join(dir, d))]
classes.sort()
class_to_idx = {classes[i]: i for i in range(len(classes))}
return classes, class_to_idx
def make_dataset(dir, extensions):
images = []
for root, _, fnames in sorted(os.walk(dir)):
for fname in sorted(fnames):
if has_file_allowed_extension(fname, extensions):
path = os.path.join(root, fname)
item = (path, 0)
images.append(item)
return images
class DatasetFolder(data.Dataset):
def __init__(self, root, loader, extensions, transform=None, target_transform=None):
# classes, class_to_idx = find_classes(root)
samples = make_dataset(root, extensions)
if len(samples) == 0:
raise(RuntimeError("Found 0 files in subfolders of: " + root + "\n"
"Supported extensions are: " + ",".join(extensions)))
self.root = root
self.loader = loader
self.extensions = extensions
self.samples = samples
self.transform = transform
self.target_transform = target_transform
def __getitem__(self, index):
"""
Args:
index (int): Index
Returns:
tuple: (sample, target) where target is class_index of the target class.
"""
path, target = self.samples[index]
sample = self.loader(path)
if self.transform is not None:
sample = self.transform(sample)
if self.target_transform is not None:
target = self.target_transform(target)
return sample
def __len__(self):
return len(self.samples)
def __repr__(self):
fmt_str = 'Dataset ' + self.__class__.__name__ + '\n'
fmt_str += ' Number of datapoints: {}\n'.format(self.__len__())
fmt_str += ' Root Location: {}\n'.format(self.root)
tmp = ' Transforms (if any): '
fmt_str += '{0}{1}\n'.format(tmp, self.transform.__repr__().replace('\n', '\n' + ' ' * len(tmp)))
tmp = ' Target Transforms (if any): '
fmt_str += '{0}{1}'.format(tmp, self.target_transform.__repr__().replace('\n', '\n' + ' ' * len(tmp)))
return fmt_str
IMG_EXTENSIONS = ['.jpg', '.jpeg', '.png', '.ppm', '.bmp', '.pgm', '.tif']
def pil_loader(path):
# open path as file to avoid ResourceWarning (https://github.com/python-pillow/Pillow/issues/835)
with open(path, 'rb') as f:
img = Image.open(f)
return img.convert('RGB')
def default_loader(path):
return pil_loader(path)
class ImageFolder(DatasetFolder):
def __init__(self, root, transform1=None, transform2=None, target_transform=None,
loader=default_loader):
super(ImageFolder, self).__init__(root, loader, IMG_EXTENSIONS,
transform=transform1,
target_transform=target_transform)
self.imgs = self.samples
self.transform2 = transform2
def set_stage(self, stage):
if stage == 'last':
self.transform = self.transform2
class ListFolder(Dataset):
def __init__(self, txt, transform):
with open(txt) as f:
imgpaths= f.readlines()
self.imgpaths = [x.strip() for x in imgpaths]
self.transform = transform
def __getitem__(self, idx):
path = self.imgpaths[idx]
image = Image.open(path)
return self.transform(image)
def __len__(self):
return len(self.imgpaths)
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