Building Machine Learning Systems with Python by Richert Willi Coelho Luis Pedro
Author:Richert, Willi, Coelho, Luis Pedro [Richert, Willi, Coelho, Luis Pedro]
Language: eng
Format: mobi, epub, pdf
Published: 0101-01-01T00:00:00+00:00
Determining the word types
Determining the word types is what part of speech (POS) tagging is all about. A POS tagger parses a full sentence with the goal to arrange it into a dependence tree, where each node corresponds to a word and the parent-child relationship determines which word it depends on. With this tree, it can then make more informed decisions; for example, whether the word "book" is a noun ("This is a good book.") or a verb ("Could you please book the flight?").
You might have already guessed that NLTK will also play a role also in this area. And indeed, it comes readily packaged with all sorts of parsers and taggers. The POS tagger we will use, nltk.pos_tag(), is actually a full-blown classifier trained using manually annotated sentences from the Penn Treebank Project (http://www.cis.upenn.edu/~treebank). It takes as input a list of word tokens and outputs a list of tuples, each element of which contains the part of the original sentence and its part of speech tag:
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Computer Vision & Pattern Recognition | Expert Systems |
Intelligence & Semantics | Machine Theory |
Natural Language Processing | Neural Networks |
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