(self, metadata)
Take actions at the beginning of an epoch.

        Parameters
        ----------
        metadata : dict
            Dictionary that is going to be populated with relevant data within `Run.launch`. Keys
            available are `epoch`, `n_epochs`.
Take actions at the beginning of an epoch.
Take actions at the beginning of an epoch .
def on_epoch_end(self, metadata):
        """Take actions at the beginning of an epoch.

        Parameters
        ----------
        metadata : dict
            Dictionary that is going to be populated with relevant data within `Run.launch`. Keys
            available are `epoch`, `n_epochs`.
        """
        pass
def on_epoch_end ( self , metadata ) : pass