为什么 matplotlib.animation.FuncAnimation 在 Jupyter 笔记本中产生空白输出？

Question

我正在学习 Python 的 matplotlib FuncAnimation 方法，但无法获得运行的基本贝叶斯共轭动画。当我运行这样做时，我的 Jupyter 笔记本中只得到一个空白输出。我也使用 Google Colab 得到相同的结果。如何将动画播放到运行并显示？

注意，我可以获得官方动画教程脚本运行...这只是下面代码的问题。

from matplotlib.animation import FuncAnimation
import matplotlib.pyplot as plt
import numpy as np
from scipy.stats import gamma, poisson

np.random.seed(0)

fig, ax = plt.subplots()
line, = ax.plot([], [])

def animate(i):
    if i == 0:
        x = np.linspace(0, 30, 1000)
        alpha = 2
        beta = 1
        y = gamma.pdf(x, a=alpha, scale=beta)
        line.set_data(x, y)
        return line,
    else:
        sample = poisson.rvs(4)
        alpha += sample
        beta += 1
        y = gamma.pdf(x, a=alpha, scale=beta)
        line.set_data(x, y)
        return line,
    
%matplotlib notebook
%matplotlib notebook

anim = FuncAnimation(fig, animate, frames=2, blit=True)
plt.show()

Answer 1

我在jupyterlab做动画的时候指定了下面的库，好像是用html5的video函数来画的

from matplotlib.animation import FuncAnimation
import matplotlib.pyplot as plt
from IPython.display import HTML
import numpy as np
from scipy.stats import gamma, poisson

np.random.seed(0)

fig, ax = plt.subplots()
line, = ax.plot([], [])

def animate(i):
    if i == 0:
        x = np.linspace(0, 30, 1000)
        alpha = 2
        beta = 1
        y = gamma.pdf(x, a=alpha, scale=beta)
        line.set_data(x, y)
        return line,
    else:
        x = np.linspace(0, 30, 1000)
        alpha = 2
        beta = 1
        sample = poisson.rvs(4)
        alpha += sample
        beta += 1
        y = gamma.pdf(x, a=alpha, scale=beta)
        line.set_data(x, y)
        return line,

anim = FuncAnimation(fig, animate, frames=2, blit=True)
# plt.show()

plt.close()
HTML(anim.to_html5_video())

为什么 matplotlib.animation.FuncAnimation 在 Jupyter 笔记本中产生空白输出？

Why is matplotlib.animation.FuncAnimation producing a blank ouput in a Jupyter notebook?

python

matplotlib

jupyter-notebook

matplotlib-animation