Note that both `then_expression`

and `else_expression`

should be symbolic tensors of the *same shape*.

`k_switch(condition, then_expression, else_expression)`

The selected tensor.

- condition
tensor (

`int`

or`bool`

).- then_expression
either a tensor, or a function that returns a tensor.

- else_expression
either a tensor, or a function that returns a tensor.

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://tensorflow.rstudio.com/reference/keras/index.html#backend.