MNISTのクラス分類などで出てくるcross entropyの式
H_{y'}(y) = - \sum_i{{y'}_i log(y_i)}
なぜ-log(y_i)を掛けるのかというのは以下の動画の12:50頃に紹介されている。
Gentlest Introduction to Tensorflow: Part 3
https://www.youtube.com/watch?v=F8g_6TXKlxw
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TensorFlow > link > cross entropy > - sum { y'_i * log(y_i) }の概念
Last updated at Posted at 2016-10-09
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