Note that alt should have the same shape as x.

k_in_train_phase(x, alt, training = NULL)



What to return in train phase (tensor or function that returns a tensor).


What to return otherwise (tensor or function that returns a tensor).


Optional scalar tensor (or R logical or integer) specifying the learning phase.


Either x or alt based on the training flag. the trainingflag defaults to k_learning_phase().

Keras Backend

This function is part of a set of Keras backend functions that enable lower level access to the core operations of the backend tensor engine (e.g. TensorFlow, CNTK, Theano, etc.).

You can see a list of all available backend functions here: