问题：初始值为10000，解收敛到10000而不是实际解1。

import numpy.linalg as nl
x_ini=10000
def obj(x):
    f = x**2 - 2*x + 3
    return f
def grad(x):
    df = 2*x - 2
    return df
n_iter=1000
lr=0.001
x_old = x_ini
for _ in range(True):
        x_new = x_old - lr*(grad(x_old))
    x_old = x_new
        if(nl.norm(grad(x_old))<=1e-03):
        break
    x_new = x_old
    print(x_new)

回答：

while True:
        x_new = x_old - lr*(grad(x_old))
    x_old = x_new
    y = nl.norm(grad(x_old))
    if(y<=1e-03):
        break
    x_new = x_old
print(x_new)

您可以将for更改为while