code: def predict_proba(self, a, b, **kwargs):
          
          return self.cds_score(b, a) - self.cds_score(a, b)
docs: Infer causal relationships between 2 variables using the CDS statistic
  
          Args:
              a (numpy.ndarray): Variable 1
              b (numpy.ndarray): Variable 2
  
          Returns:
              float: Causation score (Value : 1 if a->b and -1 if b->a)