numpy和time计时程序

import numpy as np  # 使用标准numpy，运算将在CPU上执行。
import time
start = time.perf_counter()
x = np.random.random([5000, 5000]).astype(np.float32)
k = np.matmul(x, x)
end = time.perf_counter()
elapsed = end - start
print('Time used:',elapsed)