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Table 1 Terminals used by our GP-based image retrieval framework

From: Evaluation of parameters for combining multiple textual sources of evidence for Web image retrieval using genetic programming

Terminal Description
tf Raw term frequency (number of times a term occurs in a document)
idf Inverse document frequency given by \(\log (1 + \frac{N}{df}), N\) is number of documents in the corpus and \(df\) is number of documents where the term \(t\) appears
\({\text{ tf}}*{\text{ idf}}\) tf-idf weighting scheme
avgdl Average document length
\(bm25\) Okapi BM25 ranking formula (see Eq. 5)
norm Document length