Hi,
I have been trying to work through the translation  tutorial http://pytorch.org/tutorials/intermediate/seq2seq_translation_tutorial.html 23 but with batching my code is here https://github.com/vijendra-rana/Random/blob/master/translation_with_batch.py#L226 38. Now for this I have created some fake_data and I am trying to work through that.
When I am running the program I am getting this error
RuntimeError: Trying to backward through the graph second time, but the buffers have already been freed. Please specify retain_variables=True when calling backward for the first time.

I am not able to figure out how am I running the loss.backward() twice I know we cannot run it twice (To me it looks only once.) without retain_variable = True.Also with retain_variable = True I am getting similar error.
Thanks in advance for help.