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Softmax????????????????????????0,1???????????????????V???V_i???i????Softmax?????????????
[a_i = \frac{e^{z_i}}{\sum_{j} e^{z_j}}]
???( z_i ) ?????????Softmax???????1????????????????????????????????????
?????????????10?????????????????????Softmax???????????????????????????
?????????????????????????????????( y_j = 1 )???????
[\text{Loss} = -\ln a_j]
???( a_j ) ?Softmax????j?????????
[\frac{\partial \text{Loss}}{\partial w_{ij}} = a_i (1 - a_j) \cdot o_j]
???( o_j ) ???????( w_{ij} ) ??????????????????????
[\frac{\partial \text{Loss}}{\partial w_{ij}} = a_i a_j \cdot o_j]
?????????????????????????
?????????????????[2, 3, 4]?Softmax?????????
[\begin{align*}a_1 &= \frac{e^2}{e^2 + e^3 + e^4} \a_2 &= \frac{e^3}{e^2 + e^3 + e^4} \a_3 &= \frac{e^4}{e^2 + e^3 + e^4}\end{align*}]
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[[0.0903, 0.2447 - 1, 0.665] = [0.0903, -0.7553, 0.665]]
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