wordnet

wordnet lemmatization and pos tagging in python

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First of all, you can use nltk.pos_tag() directly without training it. The function will load a pretrained tagger from a file. You can see the file name with nltk.tag._POS_TAGGER: nltk.tag._POS_TAGGER >>> ‘taggers/maxent_treebank_pos_tagger/english.pickle’ As it was trained with the Treebank corpus, it also uses the Treebank tag set. The following function would map the treebank tags … Read more

Stemmers vs Lemmatizers

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Q1: “[..] are English stemmers any useful at all today? Since we have a plethora of lemmatization tools for English” Yes. Stemmers are much simpler, smaller, and usually faster than lemmatizers, and for many applications, their results are good enough. Using a lemmatizer for that is a waste of resources. Consider, for example, dimensionality reduction … Read more

How to check if a word is an English word with Python?

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For (much) more power and flexibility, use a dedicated spellchecking library like PyEnchant. There’s a tutorial, or you could just dive straight in: >>> import enchant >>> d = enchant.Dict(“en_US”) >>> d.check(“Hello”) True >>> d.check(“Helo”) False >>> d.suggest(“Helo”) [‘He lo’, ‘He-lo’, ‘Hello’, ‘Helot’, ‘Help’, ‘Halo’, ‘Hell’, ‘Held’, ‘Helm’, ‘Hero’, “He’ll”] >>> PyEnchant comes with a … Read more