%%timeit结果解释

jupyter notebook

python3

在测一个功能的实现效率，得到这么几个结果：

123 ms ± 8.32 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)

59.2 ms ± 4.05 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)

52.4 ns ± 0.256 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

47.4 ns ± 0.105 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

哪个耗时最短（效率最高）？

为什么？