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Web Crawling Framework Development for Information Retrieval Applications

Learn to create a web crawler using Websphinx and Webgraph for Assignment 3. Utilize the provided resources and guidelines to build an architecture for information retrieval. Understand crawling methods and data extraction techniques. Develop a crawler with customized behavior for traversing links efficiently. Experiment with parsing HTML pages and analyzing web graphs to study link structures. Enhance your skills in web data retrieval and analysis for your assignment submission.

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Web Crawling Framework Development for Information Retrieval Applications

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  1. Websphinx & Webgraph Inf 141 Information Retrieval Winter 2008

  2. Assignment 3 • See course webpage for specifications • Due Friday Feb 8th • Working in groups of 2-3 people • Email with subject: Inf 141 Team Registration • Train your group • Each member of your group must be able to run your architecture on their own for Assignment 04. • Quiz next wednesday

  3. Assignment 3

  4. Websphinx • www.cs.cmu.edu/~rcm/websphinx/ • To write a crawler, extend class Crawler and override shouldVisit () and visit() to create your own crawler. • visit(): The page is passed to the crawler's visit() method for user-defined processing. • shouldVisit(Link l): Callback for testing whether a link should be traversed. • Default returns true for all links. • Override for other behaviors. • http://www.cs.cmu.edu/~rcm/websphinx/doc/index.html

  5. Websphinx • Create an array consisting of your seed set of links • Look at the Link Class • Links to webpage • Make a link from a string URL • Make a link from a start tag and end tag • Look at Page Class • Mainly supports automatically parsed HTML pages • Parsing produces a list of tags, words, an HTML parse tree, links • Can make pages

  6. Webgraph • Webgraph is a framework to study the web graph • Use ArrayListMutableGraph class • Mutable graph class based on IntArrayList • Creates a new mutable graph copying a given immutable graph • ArrayListMutableGraph(ImmutableGraph g) • View ImmutableGraph class • http://webgraph.dsi.unimi.it/docs/

  7. Questions ?

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