我有一段代码来运行回归，但我不知道为什么会出现语法错误。 下面的代码

Question

def computeCost(X,y,theta): tobesummed = np.power(((X @ theta.T)-y),2) # he yells invalid syntax no idea why return np.sum(tobesummed)/(2 * len(X))

Answer 1

There's an @ symbol in there that Python ignores as a decorator. Did you mean * or maybe X.dot(theta.T) ?

import numpy as np
def computeCost(X,y,theta):
    tobesummed = np.power(((X * theta.T)-y),2)
    return np.sum(tobesummed)/(2 * len(X))

X, y, theta = np.random.randn(1,10), np.random.randn(1,10), np.random.randn(1,10) 
print(computeCost(X, y, theta))

prints 90.03281689585363 .