If a default TensorFlow session is available, we will return it. Else, we will return the global Keras session. If no global Keras session exists at this point: we will create a new global session. Note that you can manually set the global session via k_set_session().





A TensorFlow Session.


A TensorFlow session

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.