向量化后的时间对比

import numpy as np
import time
a = np.random.rand(1000000)
b = np.random.rand(1000000)
tic = time.time()
c = np.dot(a,b)
toc = time.time()
print("Vectorized version time "+str(1000*(toc-tic)))

c = 0
tic = time.time()
for i in range(1000000):
c += a[i]b[i]
toc = time.time()
print©
print("for loop time "+str(1000(toc-tic)))