Stemming and Lemmatization Lemmatization Reduce

marina-yarberry
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Stemming and Lemmatization Lemmatization Reduce inflectionalvariant forms to base form E.g., am, are, is be car, cars, cars, cars car the boys cars are different colors the boy car be different color Lemmatization implies doing

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Stemming and Lemmatization<br>
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Lemmatization Reduce inflectional/variant forms to base form
E.g.,
am, are, is  be
car, cars, car's, cars'  car
the boy's cars are different colors  the boy car be different color
Lemmatization implies doing “proper” reduction to dictionary headword form Sec. 2.2.4<br>
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Stemming Reduce terms to their “roots” before indexing
“Stemming” suggests crude affix chopping
language dependent
e.g., automate(s), automatic, automation all reduced to automat. Sec. 2.2.4<br>