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NLL & Perplexity Loss #144

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lethienhoa opened this issue May 13, 2018 · 2 comments
Open

NLL & Perplexity Loss #144

lethienhoa opened this issue May 13, 2018 · 2 comments
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bug medium priority

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@lethienhoa
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Hi,
It seems that Perplexity is normalized twice & norm_term of NLLLoss should be masked out as well.
@manujosephv
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Is this issue still open? I checked the code and didn't see the problems mentioned. Is it fixed?

@woaksths
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woaksths commented Sep 7, 2020 •
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@lethienhoa
Yes, there need to be updated about NLLLoss norm term.
But I am also confused why loss is not divided in terms of norm_term before doing loss.backward()?

pytorch-seq2seq/seq2seq/trainer/supervised_trainer.py

Line 63 in f146087

loss.backward()

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@lethienhoa @manujosephv @woaksths @pskrunner14