[Pytorch error]IndexError: invalid index of a 0-dim tensor. Use tensor.item() to convert a 0-dim tensor to a Python number

https://github.com/NVIDIA/flownet2-pytorch/issues/113#issuecomment-450802359

invalid index of a 0-dim tensor. Use tensor.item() to convert a 0-dim tensor to a Python number · Issue #113 · NVIDIA/flownet2

Pytorch > = 0.5 인 곳에서는 [0] dim tensor가 불가능하다 

그래서 변수.data[0] --> 변수.data로 변경이 필요함