NLTK includes an excellent algorithm for word stemming, and lets you customize stemming algorithms further to your liking.
NLTK中包括一个用于单词词干提取的极好算法，并且让您可以按您的喜好定制词干提取算法。
Stemming is the process of finding the constant part of a word, which is the fragment that stays the same no matter which word tense or mode is used.
确定词干是查找单词中不变部分的过程，它是单词中与时态和语气无关的保持不变的片断。
Stemming to reduce the search term to its word stem before the search is carried out (English only).
词根化将搜索词缩减成它的词根，然后再进行搜索(只针对英语)。
Stemming to reduce the search term to its word stem before the search is carried out (English only).
词根化将搜索词缩减成它的词根，然后再进行搜索(只针对英语)。
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