week 2

1 multivariate linear regression(多元線性迴歸) 1.1 notation 1.2 gradient descent in practice 1.2.1 feature scaling(特徵縮放) 1.2.2 mean normalization(均值歸一化); 1.2.3 learning rate 1.3 選擇特徵 2 normal equation(正規方程)
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