How to disable dropout while prediction in keras?

Question

I am using dropout in neural network model in keras. Little bit code is like

model.add(Dropout(0.5))
model.add(Dense(classes))

For testing,

Answer 1

You can change the dropout in a trained model (with dropout layers):

f = K.function([model.layers[0].input, K.learning_phase()], [model.layers[-1].output])

In this way you don't have to train again the model!!!