transforms.functional.to_tensor 的作用

import torchvision.transforms as transforms

image = transforms.functional.to_tensor(image)

Convert a PIL Image or numpy.ndarray to tensor. This function does not support torchscript.

https://pytorch.org/vision/stable/transforms.html#torchvision.transforms.functional.to_tensor

Convert a PIL Image or numpy.ndarray to tensor. This transform does not support torchscript.

Converts a PIL Image or numpy.ndarray (H x W x C) in the range [0, 255] to a torch.FloatTensor of shape (C x H x W) in the range [0.0, 1.0] if the PIL Image belongs to one of the modes (L, LA, P, I, F, RGB, YCbCr, RGBA, CMYK, 1) or if the numpy.ndarray has dtype = np.uint8

In the other cases, tensors are returned without scaling.

https://pytorch.org/vision/stable/_modules/torchvision/transforms/transforms.html#ToTensor