renmin-univ-v2

renmin-univ-v2 - A Short Course on Information...

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IR Tutorial, Renmin University , China, July 18-22, 2011 A Short Course on Information Retrieval ChengXiang Zhai Department of Computer Science University of Illinois at Urbana- Champaign (Lectures at Summer Camp, Renmin University) 1
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IR Tutorial, Renmin University , China, July 18-22, 2011 Introduction A subset of lectures given for CS410 “Text Information Systems” at UIUC: http://times.cs.uiuc.edu/course/410s11/ Lectures to be given on Mon, Tue, Wed, and Thu Open book examination on Friday morning 2
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IR Tutorial, Renmin University , China, July 18-22, 2011 Course Outline Overview of Information Retrieval (IR) Vector Space Retrieval Models Implementation of IR Systems Language Models for Retrieval Evaluation of IR Systems Axiomatic Analysis of Retrieval Models Feedback in IR Web Search Engines Non-Search Applications of Retrieval Techniques 3 Core IR Topics
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IR Tutorial, Renmin University , China, July 18-22, 2011 Course Outline Overview of Information Retrieval (IR) Vector Space Retrieval Models Implementation of IR Systems Language Models for Retrieval Evaluation of IR Systems Axiomatic Analysis of Retrieval Models Feedback in IR Web Search Engines Non-Search Applications of Retrieval Techniques 4 Core IR Topics
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IR Tutorial, Renmin University , China, July 18-22, 2011 What is Information Retrieval (IR)? Narrow sense: text retrieval (TR) There exists a collection of text documents User gives a query to express the information need A retrieval system returns relevant documents to users Known as “search technology” in industry Broad sense: information access May include non-textual information May include text categorization or summarization… 5
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IR Tutorial, Renmin University , China, July 18-22, 2011 The Special Role of Textual Information The most natural way of encoding knowledge Think about scientific literature The most common type of information How much textual information do you produce and consume every day? The most basic form of information It can be used to describe other media of information The most useful form of information!
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IR Tutorial, Renmin University , China, July 18-22, 2011 Elements of Text Info Management Technologies Search Text Filtering Categorization Summarization Clustering Natural Language Content Analysis Extraction Mining Visualization Retrieval Applications Mining Applications Information Access Knowledge Acquisition Information Organization Focus of course
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IR Tutorial, Renmin University , China, July 18-22, 2011 TR vs. Database Retrieval Information Unstructured/free text vs. structured data Ambiguous vs. well-defined semantics Query Ambiguous vs. well-defined semantics Incomplete vs. complete specification Answers Relevant documents vs. matched records TR is an empirically defined problem!
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This note was uploaded on 01/09/2012 for the course CS CS273 taught by Professor Xifengyan during the Spring '11 term at UCSB.

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renmin-univ-v2 - A Short Course on Information...

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