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:
“文件“c:/Users/Desfios 5/Desktop/Python/gradientdescent.py”,第 19 行,位于
print('体重:', 体重)
NameError:名称“重量”未定义
我是Python新手,我不明白为什么它说变量“weight”未定义,而它显然是在grad_d()下定义的。
你只是忘记调用你的函数
尝试:
weight, i = grad_d()
print('Weight: ', weight)
print('Iterations: ', i)
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