Stacks a list of rank `R`

tensors into a rank `R+1`

tensor.

`k_stack(x, axis = 1)`

- x
List of tensors.

- axis
Axis along which to perform stacking (axis indexes are 1-based).

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