code: def predict_proba(self, a, b, **kwargs):
          
          return self.b_fit_score(b, a) - self.b_fit_score(a, b)
docs: Infer causal relationships between 2 variables using the RECI statistic
  
          :param a: Input variable 1
          :param b: Input variable 2
          :return: Causation coefficient (Value : 1 if a->b and -1 if b->a)
          :rtype: float