Packages 
Package Description
ir.classifiers
Provides methods for classifying text documents using machine learning.
ir.eval
Provides methods for running experiments for evaluating information retrieval.
ir.utilities
Provides utility methods for manipulating various types of data for the overall IR package
ir.vsr
Provides basic vector-space information retrieval system.
ir.webutils
Provides web utilities for downloading web pages and spidering the web.