使用joblib中的Parallel并行运行程序

joblib 是一个可以使程序并行运行的包，并行运行程序可以大大提高运行效率。

下面进行简单测试：

import time
from math import sqrt

def test_func(val):
    time.sleep(1)
    return sqrt(val**2)


start_time = time.time()
for i in range(10):
    test_func(i)

end_time = time.time()

print("use time is ", end_time - start_time)


print("=========================")


from joblib import Parallel, delayed

start_time = time.time()
Parallel(n_jobs=2)(delayed(test_func)(i) for i in range(10))

end_time = time.time()
print("use time is ", end_time - start_time)