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Suppose I have $E=-y\ log(y')$ and $y'=softmax(Vs)$.

Please refer to here.

How to compute $\partial E/\partial V$?

I proceed as follows: $\partial E/\partial V=\partial E/\partial y'\ \partial y'/\partial (Vs)\ \partial (Vs)/\partial V$

$=\frac{-y}{y'} \cdot (\mathrm{a\ matrix\ in\ terms\ of\ softmax}) \cdot s^T$

I cannot obtain the result shown there.

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