FITC_layer.py 文件源码

def compute_phi_posterior(self):
        phi = 0
        for d in range(self.Dout):
            mud_val = self.mu[d].get_value()
            Sud_val = self.Su[d].get_value()
            # s, a = npalg.slogdet(Sud_val)
            a = np.log(npalg.det(Sud_val))
            phi += 0.5 * np.dot(mud_val.T, np.dot(npalg.inv(Sud_val), mud_val))[0, 0]
            phi += 0.5 * a
        return phi