How to create a layer to invert a softmax (TensforFlow,python)?

Question

I am building a deconvolution network. I would like to add a layer to it which is the reverse of a softmax. I tried to write a basic python function that returns the inverse of

Answer 1

Thanks it works ! I put :

import keras.backend as K

def inv_softmax(x,C):
   return K.log(x)+K.log(C)