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IR (Types, DEF, Example, model) - Coggle Diagram
IR
Types
Ad Hoc Retrieval
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a collection that are relevant to an arbitrary user information need,
communicated through a one-off, user-initiated query
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DEF
is finding material (usually documents) of an unstructured nature (usually text) that satisfies an information need from within large collections (usually stored on computers).
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model
Boolean retrieval
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AND, OR, and NOT to retrieve documents
Exact-match retrieval: A document is either retrieved or not; there is no
ranking or partial relevance.
Used
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and legal research but has limitations, such as the inability to rank
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like Google (1998), Boolean retrieval became less dominant.
• Vector space models, probabilistic models, and machine
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