tf.keras.backend.in_train_phase

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Selects x in train phase, and alt otherwise.

tf.keras.backend.in_train_phase(
    x, alt, training=None
)

Note that alt should have the same shape as x.

Arguments:

• 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.

Returns:

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