models.py 文件源码

def linear_discriminant_func(self, x, k):
        """
        linear discriminant function.
        Define by (4.10)
        :return: delta_k(x)
        """
        mu_k = self.Mu[k]
        pi_k = self.Pi[k]
        sigma_inv = self.math.pinv(self.Sigma_hat)
        result = mu_k @ sigma_inv @ x.T - (mu_k @ sigma_inv @ mu_k.T)/2 + log(pi_k)
        return result