• Probabilistic models treat the process of document retrieval as a probabilistic inference. Similarities are computed as probabilities that a document is relevant for a given query. Probabilistic theorems like the Bayes' theorem are often used in these models.
o Binary Independence Model
o Probabilistic relevance model on which is based the okapi (BM25) relevance function
o Uncertain inference
o Language models
o Divergence-from-randomness model
o Latent Dirichlet allocation