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在 ML 双特征线性回归中: \hat y = a x_1 + b x_2 。正规方程组 X^TX beta = X^Ty 是 2x2。
在 ML 双特征线性回归中: \hat y = a x_1 + b x_2 。正规方程组 X^TX beta = X^Ty 是 2x2。
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