Lecture-A

Lecture-A - Lecture A Introduction to Information Retrieval...

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Lecture A Introduction to Information Retrieval
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2 Q: What is Information Retrieval? “The location and presentation to a user of information relevant to an information need expressed as a query” (Korfhage) Introduction “Information retrieval deals with the representation, storage, and access to documents or representatives of documents (document surrogates)” (Salton)
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3 Primary goal of an Information Retrieval system: “Retrieve all the documents which are relevant to a user query, while retrieving as few non-relevant documents as possible.” Introduction
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4 Introduction Goals of information retrieval (IR): Ø Retrieve information which are relevant to the user’s need (an effectiveness issue) Ø Represent and organize information for easy access (an efficiency issue) Ø Translate user information need into queries that can be processed by IR systems (an information processing issue) IR systems rank the content of each document in a collection according to a degree of relevance to the user’s query (need).
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5 Introduction Information Retrieval vs. Data Retrieval: Ø Information Retrieval : deal with natural language text which are unstructured and semantically ambiguous Ø Data Retrieval : deals with well-defined and structured data
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6 Introduction Information Retrieval on the Web Ø Finding “useful” information on the Web is a tedious and difficult task (e.g., navigating the Internet) Ø Involving the extraction of the syntactic structures (e.g., H1, H2, etc.) and the semantic structures (e.g., departments of, …) of Web documents Ø Using different criteria for making a decision on the relevance of a Web document
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Lecture-A - Lecture A Introduction to Information Retrieval...

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