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matlab信息熵代码-MachineLearning_Python-master:机器学习算法Python实现(知乎)

上传者： 38502290 | 上传时间： 2023-02-11 14:11:56 | 文件大小： 34.1MB | 文件类型： ZIP
matlab信息熵代码 机器学习算法Python实现 目录 一、 1、代价函数 其中： 下面就是要求出theta，使代价最小，即代表我们拟合出来的方程距离真实值最近 共有m条数据，其中代表我们要拟合出来的方程到真实值距离的平方，平方的原因是因为可能有负值，正负可能会抵消 前面有系数2的原因是下面求梯度是对每个变量求偏导，2可以消去 实现代码： # 计算代价函数 def computerCost(X,y,theta): m = len(y) J = 0 J = (np.transpose(X*theta-y))*(X*theta-y)/(2*m) #计算代价J return J 注意这里的X是真实数据前加了一列1，因为有theta(0) 2、梯度下降算法 代价函数对求偏导得到： 所以对theta的更新可以写为： 其中为学习速率，控制梯度下降的速度，一般取0.01,0.03,0.1,0.3..... 为什么梯度下降可以逐步减小代价函数 假设函数f(x) 泰勒展开：f(x+△x)=f(x)+f'(x)*△x+o(△x) 令：△x=-α*f'(x) ,即负梯度方向乘以一个很小的步长α 将△x代

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