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为啥要使用梯度下降法
2022-06-22 09:10:00 【code bean】
求最大值最小值的两种主流方法：
将导致设置为0当然是最简单的方法，但是有时求导之后，没法发保证左边只包含w，而右边不包含的情况，此时需要使用梯度下降法。
先随便给一个w的初始值，然后根据导函数，一步步的迭代，直到w收敛。
此时w的对应的f(w)值也越来越趋近最小值！
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