numpy和time计时程序

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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)