使用单词距离校正列内的拼写错误

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英文:

Correct typos inside a column using word distance

问题

如果在一个 pandas 数据帧中有一个包含一堆名称的列:

NAME
-------
robert
robert
robrt
marie
ann

我想要合并类似的名称以纠正/统一拼写错误,结果如下:

NAME
-------
robert
robert
robert
marie
ann

我想要使用Levenshtein距离来搜索相似的记录。也欢迎使用其他度量方法的解决方案。

非常感谢提前的帮助。

Stackoverflow上的所有示例似乎都比较多列,因此我无法找到一个适合我的问题的好解决方案。

英文:

if have a column inside a pandas df containing a bunch of names:

NAME
-------
robert
robert
robrt
marie
ann

I'd like to merge similar ones in order to correct/uniform typos, resulting in:

NAME
-------
robert
robert
robert
marie
ann

I would like to use Levenshtein distance in order to search for similar records.
Also, solutions using other metrics are much appreciated.

Thanks a lot in advance

All examples on Stackoverflow seem to compare multiple columns, so I have not been able to find a nice solution to my problem.

答案1

得分: 1

一种可能的方法如下:

import pandas as pd
from sklearn.cluster import AgglomerativeClustering
from Levenshtein import distance
import numpy as np

df = pd.DataFrame({'NAME': ['robert', 'robert', 'robrt', 'marie', 'ann']})

def merge_similar_names(df, column):
    unique_names = df[column].str.lower().str.strip().unique()
    distances = np.zeros((len(unique_names), len(unique_names)))
    for i in range(len(unique_names)):
        for j in range(i, len(unique_names)):
            d = distance(unique_names[i], unique_names[j])
            distances[i, j] = d
            distances[j, i] = d
    clusterer = AgglomerativeClustering(n_clusters=None, distance_threshold=2, linkage='complete', affinity='precomputed')
    clusters = clusterer.fit_predict(distances)
    name_clusters = pd.DataFrame({'NAME': unique_names, 'CLUSTER': clusters})
    df = pd.merge(df, name_clusters, on='NAME')
    most_common_names = df.groupby('CLUSTER')[column].apply(lambda x: x.value_counts().index[0]).reset_index()
    df = pd.merge(df, most_common_names, on='CLUSTER')
    df.rename(columns={column+'_y': column}, inplace=True)
    return df

df = merge_similar_names(df, 'NAME')

print(df)

这将给你以下结果:

   NAME_x  CLUSTER    NAME
0  robert        0  robert
1  robert        0  robert
2   robrt        0  robert
3   marie        2   marie
4     ann        1     ann
英文:

One possible approach is the following:

import pandas as pd
from sklearn.cluster import AgglomerativeClustering
from Levenshtein import distance
import numpy as np

df = pd.DataFrame({'NAME': ['robert', 'robert', 'robrt', 'marie', 'ann']})

def merge_similar_names(df, column):
    unique_names = df[column].str.lower().str.strip().unique()
    distances = np.zeros((len(unique_names), len(unique_names)))
    for i in range(len(unique_names)):
        for j in range(i, len(unique_names)):
            d = distance(unique_names[i], unique_names[j])
            distances[i, j] = d
            distances[j, i] = d
    clusterer = AgglomerativeClustering(n_clusters=None, distance_threshold=2, linkage='complete', affinity='precomputed')
    clusters = clusterer.fit_predict(distances)
    name_clusters = pd.DataFrame({'NAME': unique_names, 'CLUSTER': clusters})
    df = pd.merge(df, name_clusters, on='NAME')
    most_common_names = df.groupby('CLUSTER')[column].apply(lambda x: x.value_counts().index[0]).reset_index()
    df = pd.merge(df, most_common_names, on='CLUSTER')
    df.rename(columns={column+'_y': column}, inplace=True)
    return df

df = merge_similar_names(df, 'NAME')

print(df)

which will give you

   NAME_x  CLUSTER    NAME
0  robert        0  robert
1  robert        0  robert
2   robrt        0  robert
3   marie        2   marie
4     ann        1     ann

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  • 本文由 发表于 2023年2月23日 23:52:49
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