history.py 文件源码

def nr_of_models_alive(self, t=None) -> int:
        """
        Number of models still alive.

        Parameters
        ----------
        t: int
            Population number

        Returns
        -------
        nr_alive: int >= 0 or None
            Number of models still alive.
            None is for the last population
        """
        if t is None:
            t = self.max_t
        else:
            t = int(t)
        model_probs = self.get_model_probabilities(t)
        return int((model_probs.p > 0).sum())