测试数学工具编辑

Posted 2021-01-13 kangxinxin

$$sum=sum_{i=0}^{n}w_i(y_i-reve{y})$$

$$ begin{align} frac{partial J( heta)}{partial heta_j} & = -frac1msum_{i=0}^m(y^i-h_ heta(x^i)) frac{partial}{partial heta_j}(y^i-h_ heta(x^i)) \ & = -frac1msum_{i=0}^m(y^i-h_ heta(x^i)) frac{partial}{partial heta_j}(sum_{j=0}^n heta_jx_j^i-y^i) \ & = -frac1msum_{i=0}^m(y^i-h_ heta(x^i))x^i_j end{align} $$