mathematical formula for categorical cross entropy

[Vinayakumar R]

By reading through I came to know mathematical formulation for binary_cross entropy. Could anybody know mathematical formulation for categorical_crossentropy in keras with softmax function?

[f.ortega...@gmail.com]

For instance here:

http://deeplearning.net/software/theano/library/tensor/nnet/nnet.html#theano.tensor.nnet.nnet.categorical_crossentropy

Or here:

http://lasagne.readthedocs.io/en/latest/modules/objectives.html#lasagne.objectives.categorical_crossentropy