浮动列表之间的相似性

Question

我有一个浮点数列表，我想将其与其他列表进行比较并获得 python 中的相似率：

我要比较的列表：

[0.0000,0.0003,-0.0001,0.0002, 0.0001,0.0003,0.0000,0.0000, -0.0002,0.0002,-0.0002,0.0002, 0.0000,0.0000,-0.0002,0.0000, 0.0000,0.0000,-0.0002,-0.0001]

其他列表之一：

[0.0000,0.0002,0.0000,0.0001, 0.0003,0.0005,0.0000,0.0000, 0.0001,0.0003,-0.0001,0.0002, 0.0002,0.0003,-0.0001,0.0002, 0.0002,0.0005,-0.0010,0.0000]

我尝试将它们转换为字符串并使用 fuzzywyzzy 库 python-Levenshtein 和 difflib 来比较字符串并获得比率，但这并没有给我想要的结果而且它们非常慢.我搜索了一下，找不到任何相关信息。

比较 2 个浮点数列表的最佳方法是什么？

我想知道是否有一种本机方法来比较浮点列表的相似性，或者是否有一个库可以完成这项工作，比如许多字符串比较示例。

Answer 1

这个问题在我看来不是很清楚，不过你可以看看下面的方法是否对你有帮助：

import numpy as np
l1 = np.array([0.0000,0.0003,-0.0001,0.0002, 0.0001,0.0003,0.0000,0.0000, -0.0002,0.0002,-0.0002,0.0002, 0.0000,0.0000,-0.0002,0.0000, 0.0000,0.0000,-0.0002,-0.0001])
l2 = np.array([0.0000,0.0002,0.0000,0.0001, 0.0003,0.0005,0.0000,0.0000, 0.0001,0.0003,-0.0001,0.0002, 0.0002,0.0003,-0.0001,0.0002, 0.0002,0.0005,-0.0010,0.0000])

mse1 = ((l1 - l2)**2).mean()
# Out[180]: 6.699999999999999e-08

l1 = np.array([0.0000,0.0003,-0.0001,0.0002, 0.0001,0.0003,0.0000,0.0000, -0.0002,0.0002,-0.0002,0.0002, 0.0000,0.0000,-0.0002,0.0000, 0.0000,0.0000,-0.0002,-0.0001])
l2 = np.array([1.0000,1.0002,1.0000,0.0001, 0.0003,0.0005,0.0000,0.0000, 0.0001,0.0003,-0.0001,0.0002, 0.0002,0.0003,-0.0001,0.0002, 0.0002,0.0005,-0.0010,0.0000])

mse2 = ((l1 - l2)**2).mean()
# Out[180]: 0.15000006700000001

mse1 < mse2
# Out[187]: True

您不会得到介于 0 和 1 之间的值，但您可以比较结果，越接近 0，它们越相同。mse 代表均方误差。但还有更多指标可能与您相关，例如 msle、mae 等

浮动列表之间的相似性

Similarity between lists of floats

python

python-3.x

levenshtein-distance

difflib