Normalizes a tensor wrt the L2 norm alongside the specified axis.

`k_l2_normalize(x, axis = NULL)`

A tensor.

- x
Tensor or variable.

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

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.