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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.

is an association between a word and a part-of-speech tag.

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This will be useful when we come to developing automatic taggers, as they are trained and tested on lists of sentences, not words. Let's inspect some tagged text to see what parts of speech occur before a noun, with the most frequent ones first.

To begin with, we construct a list of bigrams whose members are themselves word-tag pairs such as Note that the items being counted in the frequency distribution are word-tag pairs.

For this reason, a special kind of dictionary called a The above examples specified the default value of a dictionary entry to be the default value of a particular data type.

However, we can specify any default value we like, simply by providing the name of a function that can be called with no arguments to create the required value.

The process of classifying words into their is a noun meaning "trash" (i.e. Thus, we need to know which word is being used in order to pronounce the text correctly.

(For this reason, text-to-speech systems usually perform POS-tagging.) seem to have their uses, but the details will be obscure to many readers.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.Note that part-of-speech tags have been converted to uppercase, since this has become standard practice since the Brown Corpus was published.Tagged corpora for several other languages are distributed with NLTK, including Chinese, Hindi, Portuguese, Spanish, Dutch and Catalan.Since words and tags are paired, we can treat the word as a condition and the tag as an event, and initialize a conditional frequency distribution with a list of condition-event pairs.

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