梯度下降案例一、y=f(x)=x²二、z = f(x,y)=x²+y² 一、y=f(x)=x² import numpy as np import pandas as pd from pandas import Series,DataFrame import matplotlib.pyplot as plt %matplotlib inline ##原函数 def f(x): return x**2 ##导数 def h(x): return 2*x X = [] Y = []