Method _split

code/chapter7.py:689–693

(self, y)

        self.loss = loss     # 损失函数
    
    def _split(self, y):
        # y 包含 y_true 在左半列，y_pred 在右半列
        col = int(np.shape(y)[1]/2)
        y, y_pred = y[:, :col], y[:, col:]
        return y, y_pred

    def _gain(self, y, y_pred):
        # 计算信息