1 / 26

Learning Patterns on the World Wide Web

Learning Patterns on the World Wide Web. Andrew Hogue Advisor: David Karger October 17, 2003. Agenda. What is a pattern? How do we make one? How do we use it? Why do you want one? Demo. What is a pattern?. Objects in the world have certain semantic properties

kato-cook
Télécharger la présentation

Learning Patterns on the World Wide Web

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Learning Patterns on the World Wide Web Andrew Hogue Advisor: David Karger October 17, 2003

  2. Agenda • What is a pattern? • How do we make one? • How do we use it? • Why do you want one? • Demo

  3. What is a pattern? • Objects in the world have certain semantic properties • A pattern is a way of recognizing the semantic properties of an object we’ve seen before • A pattern is a structure with semantic slots to be filled in

  4. Example – Books • Define an object’s semantics (ontology): Class: Book Property: Author Property: Title Property: Price Property: Publisher Property: ISBN . . .

  5. Example - Books Class: Book Property: Author Property: Title Property: Price Property: Publisher Property: ISBN . . . ? ?

  6. Example - Books Class: Book Property: Author Property: Title Property: Price Property: Publisher Property: ISBN . . .

  7. Example - Books Class: Book Property: Author Property: Title Property: Price Property: Publisher Property: ISBN . . .

  8. Creating a Pattern • Choose positive examples

  9. Creating a Pattern

  10. Creating a Pattern

  11. Creating a Pattern • Choose positive examples • Find best mapping between examples

  12. Creating a Pattern

  13. Creating a Pattern • Choose positive examples • Find best mapping between examples • Merge mapped elements and assign semantic labels

  14. Creating a Pattern

  15. Creating a Pattern

  16. Creating a Pattern

  17. Creating a Pattern

  18. Creating a Pattern • Choose positive examples • Find best mapping between examples • Merge mapped elements and assign semantic labels • Eliminate unmapped elements

  19. Creating a Pattern

  20. Creating a Pattern

  21. Matching Patterns • Given a pattern with slots and a page to search • Look for items on page with same structure • Map pattern slots to page text

  22. Matching Patterns

  23. Matching Patterns

  24. Applications • Extract search engine results • Extract and email news headlines • Watch sites for updates • Reformat sites for easier reading • Monitor bank account balances

  25. Demo

  26. More Information http://haystack.lcs.mit.edu ahogue@mit.edu

More Related