UserWarning: The given NumPy array is not writeable, and PyTorch does not support non-writeable tensors. This means you can write to the underlying (supposedly non-writeable) NumPy array using the tensor. You may want to copy the array to protect its data or make it writeable before converting it to a tensor. This type of warning will be suppressed for the rest of this program. (Triggered internally at …torchcsrcutilstensor_numpy.cpp:141.)
return torch.from_numpy(parsed.astype(m[2], copy=False)).view(*s)
UserWarning:给定的NumPy数组不可写，PyTorch不支持不可写张量。这意味着您可以使用张量写入底层（假定不可写）NumPy数组。在将数组转换为张量之前，可能需要复制数组以保护其数据或使其可写。在本程序的其余部分，此类警告将被抑制。（在…torchcscutilstensoru numpy.cpp:141内部触发。）
transform=torchvision.transforms.ToTensor()起到的作用是把PIL.Image或者numpy.narray数据类型转变为torch.FloatTensor类型，但是转换前需要拷贝一下保存，而from_numpy中却禁止复制（copy=False）。
解决方法：要不不管，要么copy=True。
