NaN problem fix#3
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The problem was the sharpening function in memory.py which had a division with no guarantee that the denominator is not zero. I have tested it by starting to learn from a checkpoint which was very close to outputting NaNs (it always happened in a couple of hundred iterations) and with this fix it worked fine for 300k more iterations. Of course the result of the loss function changed a little at first, so this is not a 100% guarantee, but I'm confident this patch removes one possibility for the NaN problem.
camigord
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Nov 17, 2017
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Thanks a lot for the fix and sorry for the huge delay... I would like to approve the pull request, but I would like to keep the current README given that the problem may still not be solved. Could you send a new pull request with only the changes in memory.py?
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The problem was the sharpening function in memory.py which had a division with no guarantee that the denominator is not zero.
I have tested it by starting to learn from a checkpoint which was very close to outputting NaNs (it always happened in a couple of hundred iterations) and with this fix it worked fine for 300k more iterations.
Of course the result of the loss function changed a little at first, so this is not a 100% guarantee, but I'm confident this patch removes one possibility for the NaN problem.