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Need help reading the derivation #5

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Interfish opened this issue Jan 15, 2019 · 1 comment
Open

Need help reading the derivation #5

Interfish opened this issue Jan 15, 2019 · 1 comment

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@Interfish
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Interfish commented Jan 15, 2019 •
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Hi, I am reading rnn-grad-deriv.pdf( which is a greate tutorial BTW!). Everything else looks fine but I am confused with those 'sigma' (I assume) symbol in formula 12b. Specifically, they are :
image

So can you give me some clue what are they meaning and what do they come from?
@go2carter
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go2carter commented Jan 19, 2019 •
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Hi Interfish, those are "delta" symbols, representing a Kronecker delta. Their value is 0 unless their two indices are identical. They come from taking derivative of V_{lm} with respect to V_{ij}.

Thanks for the feedback, and let me know if there are any other questions!

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@go2carter @Interfish