Error occurs in out-loop backward

[dieuroi]

RuntimeError: one of the variables needed for gradient computation has been modified by an inplace operation

I think the backward operation in train_one_batch (line 308 in transformer.py) has freed the graph, while this does not disturb the out-loop backward.

The error occurs when batch_loss.backward() (line 167 in MAML.py)

[jinyilun718]

same error, how to fix