def train(self,
              callbacks, monitors,
              session_creator, session_init,
              steps_per_epoch, starting_epoch=1, max_epoch=9999999):
        """
        Implemented by three lines:

        .. code-block:: python

            self.setup_callbacks(callbacks, monitors)
            self.initialize(session_creator, session_init)
            self.main_loop(steps_per_epoch, starting_epoch, max_epoch)

        You can call those methods by yourself to have better control on details if needed.
        """
        self.setup_callbacks(callbacks, monitors)
        self.initialize(session_creator, session_init)
        self.main_loop(steps_per_epoch, starting_epoch, max_epoch)

        Implemented by three lines:

        .. code-block:: python

            self.setup_callbacks(callbacks, monitors)
            self.initialize(session_creator, session_init)
            self.main_loop(steps_per_epoch, starting_epoch, max_epoch)

        You can call those methods by yourself to have better control on details if needed.
        
tensorpack/train/base.py