ToTensortrans_totensortransforms.ToTensor()img_tensortrans_totensor(img)//__call__相当于把对象当函数用 图片已经转换成tensor格式了Normalizetrans_normtransforms.Normalize([0.5,0.5,0.5],[0.5,0.5,0.5])img_normtrans_norm(img_tensor)//tensor格式的参数Resizetrans_resizetransforms.Resize((512,512))img_resizetrans_resize(img)//调整尺寸 img_resizetrans_totensor(img_resize)//转sensorCompose(调整尺寸转tensor合并操作)trans_resizetransforms.Resize((512,512))trans_composetransforms.Compose([trans_resize,trans_totensor])img_resizetrans_compose(img)