Provides the classes that implement various query expansion models.
Class Summary Class Description BAThis class implements an approximation of the binomial distribution through the Kullback-Leibler divergence to weight query terms for query expansion. Bo1This class implements the Bo1 model for query expansion. Bo2This class implements the Bo2 model for query expansion. InformationThis class implements the Kullback-Leibler divergence for query expansion. KLThis class implements the Kullback-Leibler divergence for query expansion. KLCompleteThis class implements the complete Kullback-Leibler divergence for query expansion. KLCorrectThis class implements the correct Kullback-Leibler divergence for query expansion, which takes the contribution into consideration. QueryExpansionModelThis class should be extended by the classes used for weighting terms and documents. QueryExpansionModelFactoryA factory method for handling the initialisation of expansion models.