Python 错误:NameError: name is not defined [英] Python error: NameError: name is not defined

问题描述

import numpy as np
from scipy import optimize as opt
import time

def grad_d():
    weight = [0, 0]
    learnrate = 0.01
    tol = 1.e-5
    itmax = 1000

    for i in range(itmax):
        deltaweight = - learnrate * opt.rosen_der(weight)
        weight = weight + deltaweight
        if abs(deltaweight) < learnrate:
            break
    
    return weight, i
    
print('Weight: ', weight)
print('Iterations: ', i)

运行代码后，我收到错误消息:

After running the code, I receive error message:

文件c:/Users/Desfios 5/Desktop/Python/gradientdescent.py"，第 19 行，在打印('重量:'，重量)NameError: name 'weight' 未定义

"File "c:/Users/Desfios 5/Desktop/Python/gradientdescent.py", line 19, in print('Weight: ', weight) NameError: name 'weight' is not defined

我是 Python 新手，我不明白为什么它说变量weight"是显然在 grad_d() 下定义时未定义.

I am new to Python and I do not understand why it is saying that the variable "weight" is undefined when it clearly appears to be defined under grad_d().

推荐答案

你只是忘了调用你的函数试试:

You just forgot to call your function Try:

weight, i = grad_d()
print('Weight: ', weight)
print('Iterations: ', i)

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