Synopsis

It is a set of some classes from the course "Information Retrieval" based on the book "An Introduction to Information Retrieval" by Christopher D. Manning and others.

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Content

Now it has:

• Following retrieval models:
  • Boolean retrieval - supports boolean operations (AND, OR) and parentheses - see class BooleanRetrieavalApp, BooleanRetrieval and tests
  • Biword retrieval - see class BiwordRetrieaval and tests
  • Free text retrieval - see class FreeTextRetrival and FreeTextRetrivalApp.
• Naive Bayes Classificator - see NaiveBayesApp

To get acquainted with model, see %ModelName%_App.

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Datasets

You can find some datasets to play with in general/data.

Preprocessing

Token filtering

• NumberFilter - eliminates numbers - see NumberFilter

Token processing

• Normalizer - see NormilizerTokenProcessor
• Soundex - see Soundex and SoundexTokenProcessor
• Porter's stemmer - see Stemmer and StemmerTokenProcessor

Naive Bayes

NaiveBayesApp is an example of Naive Bayes for spam filtering. It uses dataset data/Emails for training and testing.