# fit the model
m3.fit(X_train, y_train,
       epochs=50,
       batch_size=256,
       verbose=0)

# evaluate the model
m3.evaluate(X_train, y_train, batch_size=256)

# fit on test data
m3.fit(X_test, y_test,
       epochs=50,
       batch_size=256,
       verbose=0)

# evaluate the model
m3.evaluate(X_test, y_test, batch_size=256)