TensorFlow 1 version View source on GitHub

Selects x in train phase, and alt otherwise.

    x, alt, training=None

Note that alt should have the same shape as x.


  • x: What to return in train phase (tensor or callable that returns a tensor).
  • alt: What to return otherwise (tensor or callable that returns a tensor).
  • training: Optional scalar tensor (or Python boolean, or Python integer) specifying the learning phase.


Either x or alt based on the training flag. the training flag defaults to K.learning_phase().