(self, metadata)
Take actions at the beginning of a batch.

        Parameters
        ----------
        metadata : dict
            Dictionary that is going to be populated with relevant data within `Run.launch`. Keys
            available are 'asset_names', 'batch', 'epoch', 'timestamps', 'X_batch', 'y_batch'.
Take actions at the beginning of a batch.
Take actions at the beginning of a batch .
def on_batch_begin(self, metadata):
        """Take actions at the beginning of a batch.

        Parameters
        ----------
        metadata : dict
            Dictionary that is going to be populated with relevant data within `Run.launch`. Keys
            available are 'asset_names', 'batch', 'epoch', 'timestamps', 'X_batch', 'y_batch'.
        """
        pass
def on_batch_begin ( self , metadata ) : pass