# Keras backend (tensorflow) vs tensorflow [closed]

I do not really understand the difference between Keras backend (when you use tensorflow as backend) and tensorflow. I saw some posts where people were trying to modify a Keras loss function and to do so, they were using keras.backend functions.

Is it possible to use directly functions from tensorflow ? Because on tensorflow, there are many more function available than on keras.backend.

## closed as off-topic by Sycorax, Firebug, Ferdi, kjetil b halvorsen, Jan KukackaSep 27 '18 at 7:42

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