Called at end of each step for each callback in callbackList

def on_step_end(self, step, logs={}):
        """ Called at end of each step for each callback in callbackList"""
        for callback in self.callbacks:
            # Check if callback supports the more appropriate `on_step_end` callback.
            # If not, fall back to `on_batch_end` to be compatible with built-in Keras callbacks.
            if callable(getattr(callback, 'on_step_end', None)):
                callback.on_step_end(step, logs=logs)
            else:
                callback.on_batch_end(step, logs=logs)