多元回归:梯度下降定义错误

问题描述

def gradientDescent(X,y,theta,alpha,i):
J = []  #cost function in each iterations
k = 0
while k < i:        
    y1 = hypothesis(theta,X)
    y1 = np.sum(y1,axis=1)
    for c in range(0,len(X.columns)):
        theta[c] = theta[c] - alpha*(sum((y1-y)*X.iloc[:,c])/len(X))
    j = computeCost(X,theta)
    J.append(j)
    k += 1
return J,j,theta
J,theta = gradientDescent(X,0.05,10000)

如果我运行这段代码,会出现如下错误

    Traceback (most recent call last)
<ipython-input-64-d17a8fb83984> in <module>()
----> 1 J,10000)

<ipython-input-62-bfec0d0edcfa> in gradientDescent(X,i)
      6         y1 = np.sum(y1,axis=1)
      7         for c in range(0,len(X.columns)):
----> 8             theta[c] = theta[c] - alpha*(sum((y1-y)*X.iloc[:,c])/len(X))
      9         j = computeCost(X,theta)
     10         J.append(j)

TypeError: 'numpy.int64' object is not callable

我希望立即有任何解决方案。谢谢。

解决方法

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