RuntimeError: One of the differentiated Tensors appears to not have been used in the graph. Set allow_unused=True if this is the desired behavior

[arhouati (Abdelkader Rhouati)]

@Simon_fei

I search the similar problem that has exists in other man’s work, the cause is that they use ‘.detach()’ or ‘.data’ or ‘.numpy()’ somewhere in the chain. After investigation, I don’t have this problem. So I want to know what the causes of problem I am facing?

How did you check this ? there is any tools or methods to verify computational graph ?
I have the same problem, but it’s not easy for me to check since my model is little complicated.