# k_in_train_phase

## Selects `x`

in train phase, and `alt`

otherwise.

## Description

Note that `alt`

should have the **same shape** as `x`

.

## Usage

```
k_in_train_phase(x, alt, training = NULL)
```

## Arguments

Arguments | Description |
---|---|

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

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

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

## Section

## 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: https://keras.rstudio.com/articles/backend.html#backend-functions.

## Value

Either `x`

or `alt`

based on the `training`

flag. the `training`

flag defaults to `k_learning_phase()`

.