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Add lemmatization option for normalizing loaded documents #189

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Add lemmatization option for normalizing loaded documents #189

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7 changes: 6 additions & 1 deletion pke/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -58,7 +58,8 @@ def load_document(self, input, language=None, stoplist=None,
stoplist (list): custom list of stopwords, defaults to
pke.lang.stopwords[language].
normalization (str): word normalization method, defaults to
'stemming'. Other possible value is 'none'
'stemming'. Other possible values are 'lemmatization'
for using lemmas as stems and 'none'
for using word surface forms instead of stems/lemmas.
spacy_model (spacy.lang): preloaded spacy model when input is a
string.
Expand Down Expand Up @@ -119,6 +120,10 @@ def load_document(self, input, language=None, stoplist=None,
for i, sentence in enumerate(self.sentences):
self.sentences[i].stems = [stemmer.stem(w).lower() for w in sentence.words]

elif self.normalization == 'lemmatization':
for i, sentence in enumerate(self.sentences):
self.sentences[i].stems = sentence.meta['lemmas']

else:
for i, sentence in enumerate(self.sentences):
self.sentences[i].stems = [w.lower() for w in sentence.words]
Expand Down