63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
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import json
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import collections
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import torchvision
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from torchvision import transforms
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from torch.utils.data import DataLoader
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import torch.nn.functional as F
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# Borrowed from https://github.com/ozan-oktay/Attention-Gated-Networks
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def json_file_to_pyobj(filename):
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def _json_object_hook(d): return collections.namedtuple('X', d.keys())(*d.values())
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def json2obj(data): return json.loads(data, object_hook=_json_object_hook)
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return json2obj(open(filename).read())
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def get_loaders(dataset, train_batch_size=128, test_batch_size=10):
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print(f"Train batch size: {train_batch_size}")
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if dataset == 'cifar10':
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normalize = transforms.Normalize((0.4914, 0.4822, 0.4465), (0.2023, 0.1994, 0.2010))
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train_transform = transforms.Compose([
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transforms.ToTensor(),
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transforms.Lambda(lambda x: F.pad(x.unsqueeze(0),
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(4, 4, 4, 4), mode='reflect').squeeze()),
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transforms.ToPILImage(),
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transforms.RandomCrop(32),
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transforms.RandomHorizontalFlip(),
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transforms.ToTensor(),
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normalize,
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])
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test_transform = transforms.Compose([
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transforms.ToTensor(),
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normalize
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])
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trainset = torchvision.datasets.CIFAR10(root='./data', train=True, download=True, transform=train_transform)
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trainloader = DataLoader(trainset, batch_size=train_batch_size, shuffle=True, num_workers=4)
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testset = torchvision.datasets.CIFAR10(root='./data', train=False, download=True, transform=test_transform)
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testloader = DataLoader(testset, batch_size=test_batch_size, shuffle=True, num_workers=4)
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elif dataset == 'svhn':
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normalize = transforms.Normalize((0.4377, 0.4438, 0.4728), (0.1980, 0.2010, 0.1970))
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transform = transforms.Compose([
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transforms.ToTensor(),
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normalize,
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])
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trainset = torchvision.datasets.SVHN(root='./data', split='train', download=True, transform=transform)
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trainloader = DataLoader(trainset, batch_size=train_batch_size, shuffle=True, num_workers=4)
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testset = torchvision.datasets.SVHN(root='./data', split='test', download=True, transform=transform)
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testloader = DataLoader(testset, batch_size=test_batch_size, shuffle=True, num_workers=4)
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return trainloader, testloader
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