File size: 2,993 Bytes
cdf6bfb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | import torch
from torch.utils.data import DataLoader
from torchvision import transforms
from torchvision.transforms.functional import InterpolationMode
from .dataset import pretrain_dataset, finetune_dataset
from .randaugment import RandomAugment
def create_dataset(dataset, config, min_scale=0.5):
normalize = transforms.Normalize((0.48145466, 0.4578275, 0.40821073), (0.26862954, 0.26130258, 0.27577711))
transform_train = transforms.Compose([
transforms.RandomResizedCrop(config['image_size'],scale=(min_scale, 1.0),interpolation=InterpolationMode.BICUBIC),
transforms.RandomHorizontalFlip(),
RandomAugment(2,5,isPIL=True,augs=['Identity','AutoContrast','Brightness','Sharpness','Equalize',
'ShearX', 'ShearY', 'TranslateX', 'TranslateY', 'Rotate']),
transforms.ToTensor(),
normalize,
])
transform_inputsize_224 = transforms.Compose([
transforms.RandomResizedCrop(224,scale=(min_scale, 1.0),interpolation=InterpolationMode.BICUBIC),
transforms.RandomHorizontalFlip(),
RandomAugment(2,5,isPIL=True,augs=['Identity','AutoContrast','Brightness','Sharpness','Equalize',
'ShearX', 'ShearY', 'TranslateX', 'TranslateY', 'Rotate']),
transforms.ToTensor(),
normalize,
])
if dataset=='pretrain':
dataset = pretrain_dataset(config['train_file'], transform_train, class_num=config['class_num'], root=config['image_path_root'])
return dataset
elif dataset=='finetune':
dataset = finetune_dataset(config['train_file'], transform_train, transform_inputsize_224, class_num=config['class_num'], root=config['image_path_root'])
return dataset
def create_sampler(datasets, shuffles, num_tasks, global_rank):
samplers = []
for dataset,shuffle in zip(datasets,shuffles):
sampler = torch.utils.data.DistributedSampler(dataset, num_replicas=num_tasks, rank=global_rank, shuffle=shuffle)
samplers.append(sampler)
return samplers
def create_loader(datasets, samplers, batch_size, num_workers, is_trains, collate_fns):
loaders = []
for dataset,sampler,bs,n_worker,is_train,collate_fn in zip(datasets,samplers,batch_size,num_workers,is_trains,collate_fns):
if is_train:
shuffle = (sampler is None)
drop_last = True
else:
shuffle = False
drop_last = False
loader = DataLoader(
dataset,
batch_size=bs,
num_workers=n_worker,
pin_memory=True,
sampler=sampler,
shuffle=shuffle,
collate_fn=collate_fn,
drop_last=drop_last,
)
loaders.append(loader)
return loaders
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