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排序
（1）插入排序：直接插入排序、二分法插入排序、希尔排序
（2）选择排序：直接选择排序、堆排序
（3）交换排序：冒泡排序、快速排序
（4）归并排序
（5）基数排序
# [::-1]:用法
import numpy as np
a=np.random.rand(5)
print(a)
[ 0.64061262 0.8451399 0.965673 0.89256687 0.48518743]
print(a[-1]) ###取最后一个元素
[0.48518743]
print(a[:-1]) ### 除了最后一个取全部
[ 0.64061262 0.8451399 0.965673 0.89256687]
print(a[::-1]) ### 取从后向前（相反）的元素
[ 0.48518743 0.89256687 0.965673 0.8451399 0.64061262]
print(a[2::-1]) ### 取从下标为2的元素翻转读取
[ 0.965673 0.8451399 0.64061262]
**Bold** and _Italic_ and `Code` text
[Link](url) and 
PPO标准教学
https://github.com/louisnino/RLcode/blob/10296e8536e5f661a05be2d3995363e8cf36194c/tutorial_PPO.py
推导
https://blog.csdn.net/qq_37266917/article/details/109855244