How to switch Backend with Keras (from TensorFlow to Theano)

Question

I tried to switch Backend with Keras (from TensorFlow to Theano) but did not manage. I followed the temps described here but it doesn\'t work. I created a keras.json in the

Answer 1

In windows, you need to find .keras folder in your C drive. Most probably, it will be somewhere in C:/users/username/. There you will find .keras folder, it contains a json file, keras.json, open it. You will see:

{
“backend”: “tensorflow”,
“floatx”: “float32”,
“epsilon”: 1e-07
}

more or less. replace 'tensorflow' with 'theano'. and save the file.

Answer 2

In case you want to change the config permanently, the json is available here: ~/.keras/keras.json and you can change the backend.

To do this dynamically in python 2.7 you can run:

from keras import backend as K
import os

def set_keras_backend(backend):

    if K.backend() != backend:
        os.environ['KERAS_BACKEND'] = backend
        reload(K)
        assert K.backend() == backend

set_keras_backend("theano")