torch.Tensor中的clone（）⽅法
clone() → Tensor
clone
Returns a copy of the self tensor. The copy has the same size and data type as self.
NOTE
Unlike copy_(), this function is recorded in the computation graph. Gradients propagating to the cloned tensor will propagate to the original tensor.
返回⼀个张量的副本，其与原张量的尺⼨和数据类型相同。
与copy_()不同，这个函数记录在计算图中。传递到克隆张量的梯度将传播到原始张量。
copy_(src, non_blocking=False) → Tensor
Copies the elements from src into self tensor and returns self.
The src tensor must be  with the self tensor. It may be of a different datatype or reside on a different device.
Parameters
src () – the source tensor to copy from
non_blocking () – if True and this copy is between CPU and GPU, the copy may occur asynchronously with respect to the host.
For other cases, this argument has no effect.

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