Numpy Warning

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.

问题解决思路：

这种问题一般是由于获得的ndaray对象是不可写的， print(arr.flags['WRITEABLE'])会输出False。因此只要对获得的不可写的对象进行拷贝一份即可numpy.cp(obj)

案例：

data = PIL_obj # 通过PIL库读取的图片数据
self.transform = transforms.Compose([transforms.RandomCrop(84, padding=4),
                                                 lambda x: np.copy(np.asarray(x)),
                                                 transforms.ToTensor(),
                                                 normalize])
self.transform(data)

在没有使用np.copy()的情况下就会报上面的警告。