Package nltk :: Package metrics :: Module association

Module association

Provides scoring functions for a number of association measures through a generic, abstract implementation in NgramAssocMeasures, and n-specific BigramAssocMeasures and TrigramAssocMeasures.

Classes

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NgramAssocMeasures
An abstract class defining a collection of generic association measures.

BigramAssocMeasures
A collection of trigram association measures.

TrigramAssocMeasures
A collection of trigram association measures.

ContingencyMeasures
Wraps NgramAssocMeasures classes such that the arguments of association measures are contingency table values rather than marginals.

Functions

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_log2(x)

source code

_product(s)

source code

Variables

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_SMALL = 1e-20

NGRAM = 0
Marginals index for the ngram count

UNIGRAMS = -2
Marginals index for a tuple of each unigram count

TOTAL = -1
Marginals index for the number of words in the data