ValueError: Unknown projection '3d'

# -*- coding: utf-8 -*-
"""
@File    : 1.py
@Time    : 2020/5/25 21:33
@Author  : Dontla
@Email   : [email protected]
@Software: PyCharm
"""
# 第一种创建3D图形的方法:创建子图

# 用创建子图的方法画出来感觉要比下面的方法小一点??

from matplotlib import pyplot as plt  # 用来绘制图形

import numpy as np  # 用来处理数据

fig = plt.figure()

print('fig的类型:', type(fig), '\n')

print('fig:\n', fig, '\n')

ax = fig.add_subplot(111, projection='3d')

print('ax的类型:', type(ax), '\n')

print('ax:\n', ax, '\n')

X = np.arange(-10, 10, 0.25)

Y = np.arange(-10, 10, 0.25)

X, Y = np.meshgrid(X, Y)

Z = 3 * X ** 2 + 2 * Y ** 2 + 5

ax.plot_surface(X, Y, Z, cmap='rainbow')

plt.show()

D:\20200228_play_with_pytorch\python\python.exe C:/Users/SIQI/Desktop/绘制神经网络输出函数图像/1.py
Traceback (most recent call last):
  File "D:\20200228_play_with_pytorch\python\lib\site-packages\matplotlib\projections\__init__.py", line 58, in get_projection_class
    return projection_registry.get_projection_class(projection)
  File "D:\20200228_play_with_pytorch\python\lib\site-packages\matplotlib\projections\__init__.py", line 25, in get_projection_class
    return self._all_projection_types[name]
KeyError: '3d'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users/SIQI/Desktop/绘制神经网络输出函数图像/1.py", line 23, in <module>
    ax = fig.add_subplot(111, projection='3d')
  File "D:\20200228_play_with_pytorch\python\lib\site-packages\matplotlib\figure.py", line 1396, in add_subplot
    self._process_projection_requirements(*args, **kwargs)
  File "D:\20200228_play_with_pytorch\python\lib\site-packages\matplotlib\figure.py", line 1120, in _process_projection_requirements
    projection_class = projections.get_projection_class(projection)
  File "D:\20200228_play_with_pytorch\python\lib\site-packages\matplotlib\projections\__init__.py", line 60, in get_projection_class
    raise ValueError("Unknown projection %r" % projection)
ValueError: Unknown projection '3d'
fig的类型: <class 'matplotlib.figure.Figure'>

fig:
 Figure(640x480)


Process finished with exit code 1

from mpl_toolkits.mplot3d import Axes3D