Information Retrieval: Glossary

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Note: the content of this post is mainly notes taken from professor Stefano Mizzaro’s lessons on (Web) Information Retrieval at Uniud.

Common terms

These terms are used in different topics of IR and it is useful to define them before diving specifically into a topic:

  • dj: document
  • N: number of documents in the collection
  • Index term: if the term is in the index
  • t: number of terms in the index
  • ki: keyword, a term in the index
  • K: set of keywords
  • wi,j: weight of ki in dj