Inconsistent loading of keras backend between theano and tensorflow

Question

My keras.json has backend specified to be tensorflow and if I open Spyder and Jupyter IDE then tensorflow is used as a backend.

Strangely if I open python or ipython shell within my WinPython installation, the backend defaults into theano . Has anyone seen this behaviour before and if so what was the solution?

I have tried playing with environment variables to no effect.

Answer 1

I have exactly same issue. Some how after I installed shell kernel Ipython/Jupyter is pointing properly to tensor flow

import os

os.environ['KERAS_BACKEND']='tensorflow'
import keras
keras.backend.backend()

Answer 2

Looks like existing notebooks still say Theano. But If I create new one and enter the following then I get proper result as tensorflow import os

os.environ['KERAS_BACKEND']='tensorflow'
import keras
keras.backend.backend()

Using TensorFlow backend. Out[1]: 'tensorflow' In [ ]: