module 'numpy' has no attribute 'polyfit2d'. Did you mean: 'polyfit'?

根据提供的引用内容，可以得知在使用numpy模块时，出现了"module 'numpy' has no attribute 'polyfit2d'. Did you mean: 'polyfit'?"的错误提示。这是因为numpy模块中没有名为polyfit2d的函数，但有一个名为polyfit的函数。因此，建议将代码中的polyfit2d改为polyfit即可解决问题。

示例代码如下：

import numpy as np
from mpl_toolkits.mplot3d import Axes3D
import matplotlib.pyplot as plt

# 生成数据
x = np.array([0, 1, 2, 3, 4, 5])
y = np.array([0, 1, 2, 3, 4, 5])
z = np.array([0, 1, 2, 3, 4, 5])
xx, yy = np.meshgrid(x, y)

# 拟合平面
coefficients = np.polyfit(np.ravel(xx), np.ravel(yy), 1)
a, b = coefficients

# 绘制图形
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.scatter(xx, yy, z)
ax.plot_surface(xx, yy, a*xx+b*yy, alpha=0.5)
plt.show()