logit_rules.py 文件源码

def update_empty_probability(self):
        """ Update Theta_0 from its prior based on length of the rule list.

        """
        if len(self.current_state.rl) > 0:
            # effectively, the 'emptiness' trial has failed
            conditional_a = self.model.hyperparameter_a_empty
            conditional_b = self.model.hyperparameter_b_empty + 1
        else:
            conditional_a = self.model.hyperparameter_a_empty + 1
            conditional_b = self.model.hyperparameter_b_empty
        new_empty_probability = scipy.stats.beta.rvs(
            conditional_a,
            conditional_b
        )
        self.current_state.empty_probability = new_empty_probability