import torch as t
from torch.utils import data
import os
from PIL import Image
import numpy as np
import torchvision.transforms as T
transforms = T.Compose([
T.Resize(224),
T.CenterCrop(224),
T.ToTensor(),
T.Normalize(mean=(0.5, 0.5, 0.5), std=(0.5, 0.5, 0.5))
])
# 继承Dataset类要重写__getitem__
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