错误处理:one of the variables needed for gradient computation has been modified by inplace operation(代码片
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RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation: [torch.cuda.FloatTensor [1, 100]], which is output 0 of UnsqueezeBackward0, is at version 5040; expected version 5039 instead.错误分析：
由于pytorch升级到pytorch0.4之后，与之前pytorch0.3的用法发生来了一些变化，比如最重要的在pytorch0.4中将Tensor与Variance都组合成了同一个东西，pytorch0.4不再支持inplace操作。
解决方法：
1.把所有的inplace=True改成inplace=False
2.将loss+=new_loss这样所有的+=操作，改成loss=loss+new_loss
3.将pytorch版本回退到0.3，或者添加一个pytorch0.3的环境。
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