'Inverted file' diaporamas de présentation

Processing of large document collections

Processing of large document collections. Part 5. In this part:. Indexing querying index construction. Indexing. An index is a mechanism for locating a given term in a text Index in a book it is possible to find information without browsing the pages

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Information Retrieval

Information Retrieval. hussein suleman uct cs 3003s 2006. Introduction. Information retrieval is the process of locating the most relevant information to satisfy a specific information need. Traditionally, we used databases and keywords to locate information.

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Information Management Information Retrieval

Information Management Information Retrieval. hussein suleman uct cs 303 2004. Introduction. Information retrieval is the process of locating the most relevant information to satisfy a specific information need. Traditionally, we used databases and keywords to locate information.

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Introduction to Digital Libraries Information Retrieval

Introduction to Digital Libraries Information Retrieval. Sample Statistics of Text Collections. Dialog : claims to have >12 terabytes of data in >600 Databases, > 800 million unique records

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CS533 Information Retrieval

CS533 Information Retrieval. Dr. Michal Cutler Lecture #12 March 3 , 1999. This lecture. Evaluation Creating an inverted index file (sources Managing Gigabytes Witten, Moffat, and Bell, chapter 5. Information retrieval, Grossman and Frieder pages 137-142). Fallout. Fallout=

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454 Course Overview

454 Course Overview. Introduction [2 classes] Networking basics Foundational protocols (e.g. HTTP, HTML), browser arch Server basics, log files, cookies Information Retrieval [6 classes] Spider search strategy, politeness, scalability

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454 Course Overview

454 Course Overview. Introduction [2 classes] Networking basics Foundational protocols (e.g. HTTP, HTML), browser arch Server basics, log files, cookies Information Retrieval [6 classes] Spider search strategy, politeness, scalability

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CS 430 / INFO 430 Information Retrieval

CS 430 / INFO 430 Information Retrieval. Lecture 4 Searching Full Text 4. Course Administration. Assignment 1 has been posted. It is a programming assignment and is due on Sunday, September 17 at 11 p.m. Follow the instructions carefully . Send questions to cs430-l@cs.cornell.edu.

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CS336 Lecture 5:

CS336 Lecture 5:. Inverted Files, Signature Files, Bitmaps. Generating Document Representations. Use significant terms to build representations of documents referred to as indexing Manual indexing : professional indexers Assign terms from a controlled vocabulary Typically phrases

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Modern Information Retrieval

Modern Information Retrieval. Chapter 9: Parallel and Distributed IR Section 9.1: Introduction Section 9.2.2.: MIMD Architectures Inverted Files November 5, 1999. Summary. Introduction Review of parallel computing and parallel program performance measures

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Indexing

Indexing. Overview of the Talk. Inverted File Indexing Compression of inverted files Signature files and bitmaps Comparison of indexing methods Conclusion. Usual granularity is document-level, unless a significant fraction of the queries are expected to be proximity-based.

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5.Index Construction

5.Index Construction. ???????. ??. Memory-based inversion Sort-based inversion Exploiting index compression Compressed in-memory inversion Comparison of inversion methods Constructing signature files and bitmaps Dynamic collections. The problem is the size of the frequency matrix.

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5.Index Construction

5.Index Construction. ???????. ??. Memory-based inversion Sort-based inversion Exploiting index compression Compressed in-memory inversion Comparison of inversion methods Constructing signature files and bitmaps Dynamic collections. The problem is the size of the frequency matrix.

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5.Index Construction

5.Index Construction. ???????. ??. Memory-based inversion Sort-based inversion Exploiting index compression Compressed in-memory inversion Comparison of inversion methods Constructing signature files and bitmaps Dynamic collections. The problem is the size of the frequency matrix.

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CS 430: Information Discovery

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CS 430: Information Discovery

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CS/Info 430: Information Retrieval

CS/Info 430: Information Retrieval. Sample Midterm Examination Notes on the Solutions. Midterm Examination -- Question 1. 1(a) Define the terms inverted file , inverted list , posting. Inverted file: a list of the words in a set of documents and the documents in which they appear.

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Indexing and Complexity

Indexing and Complexity. Agenda. Inverted indexes Computational complexity. Some Interesting Questions. How long will it take to find a document? Is there any work we can do in advance? If so, how long will that take? How big a computer will I need? How much disk space? How much RAM?

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Lecture 4: Indexing Files

Lecture 4: Indexing Files. Inverted File Lexical Analysis Stop lists. Indexing. Arrangement of data (data structure) to permit fast searching Which list is easier to search? sow fox pig eel yak hen ant cat dog hog ant cat dog eel fox hen hog pig sow yak. Creating inverted files.

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Inverted File Compression

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