The function arguments use the same convention as Theano's arange: if only
one argument is provided, it is in fact the "stop" argument. The default
type of the returned tensor is `'int32'`

to match TensorFlow's default.

`k_arange(start, stop = NULL, step = 1, dtype = "int32")`

An integer tensor.

- start
Start value.

- stop
Stop value.

- step
Difference between two successive values.

- dtype
Integer dtype to use.

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.