About random number seeds

The random number in the computer is not a real random number, but a random number generated by some algorithm.

Just use a fixed random number seed to generate a fixed sequence of random numbers

The example is as follows

import numpy as np

 
num = 0
while (num < 5):
    np.random.seed(0)
    print(np.random.rand(1,5)) # 得到一个范围从0到1的 1行5列的随机数
    num += 1
 
print('-------------------------')

The results obtained are as follows

In fact, the random number seed can only be used once, and the next time you use it, you must re-declare the random number seed

import numpy as np

 
num = 0
while (num < 5):
    np.random.seed(0)
    print(np.random.rand(1,5)) # 得到一个范围从0到1的 1行5列的随机数
    num += 1
 
print('-------------------------')

 The result is as follows

You will find that only the first one is the same, so you must declare it again every time you use the random number seed