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Understanding why such words are tagged as they are in each context can help us clarify the distinctions between the tags.
We can create one of these special tuples from the standard string representation of a tagged token, using the function Other corpora use a variety of formats for storing part-of-speech tags.Back in elementary school you learnt the difference between nouns, verbs, adjectives, and adverbs.These "word classes" are not just the idle invention of grammarians, but are useful categories for many language processing tasks.In general, we would like to be able to map between arbitrary types of information.3.1 lists a variety of linguistic objects, along with what they map.
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NLTK's corpus readers provide a uniform interface so that you don't have to be concerned with the different file formats.