逻辑回归模型(二分类): 代价函数cost function为: 同样通过梯度下降算法计算最小的cost来得到参数,迭代多次直到收敛 每次迭代参数更新:
線性迴歸模型:$h_\theta(x) = \theta * x$ 參數$\theta = (\theta_0, \theta_2, ..., \theta_n)$ Cost Function爲:$J(\theta) = \frac{1}{2} \sum_i \left( h_\theta(x^{(i)}) - y^{(i)} \right)2$ m爲訓練集的大小,解線性迴歸模型即就是求出最小的Cost F…
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