def after_eval_exp(self, strategy: "SupervisedTemplate"):
        """Performs actions after evaluating an experience.

        :param strategy: The strategy object associated with the stream.
        """
        super().after_eval_exp(strategy)
        curr_exp = strategy.experience.current_experience
        self.update(self.num_training_steps, curr_exp)
Performs actions after evaluating an experience.

        :param strategy: The strategy object associated with the stream.
        
avalanche/evaluation/metrics/acc_matrix.py