代码有时候在一开始Import之间会出现seed_value设置，是有什么作用呢？

import os
import re
import json
import pickle
from collections import defaultdict

seed_value = int(os.getenv('RANDOM_SEED', -1))
if seed_value != -1:
    import random
    random.seed(seed_value)
    import numpy as np
    np.random.seed(seed_value)
    import tensorflow as tf
    tf.set_random_seed(seed_value)

from keras.preprocessing.sequence import pad_sequences

from model import VariationalAutoencoder, Autoencoder

我遇到的代码如上，我不太明白设置seed_value = int(os.getenv('RANDOM_SEED', -1)) 有什么作用呢？
如果seed_value = -1的话，那代表什么意思呢？会怎么样呢？

参考一下这个吧 https://blog.csdn.net/m0_61377301/article/details/121099775?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522165243464216781435413756%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=165243464216781435413756&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~sobaiduend~default-2-121099775-null-null.142^v9^control,157^v4^control&utm_term=python+os.getenv&spm=1018.2226.3001.4187