def __init__(self, current_metric: TMetric):
        """
        Creates an instance of the GenericStreamForwardTransfer metric.
        """

        super().__init__(current_metric)

        self.stream_forward_transfer = Mean()
        """
        The average forward transfer over all experiences
        """

        Creates an instance of the GenericStreamForwardTransfer metric.
        
avalanche/evaluation/metrics/forward_transfer.py