Unit 1 summary
This presentation is the property of its rightful owner.
Sponsored Links
1 / 5

Unit #1 Summary PowerPoint PPT Presentation


  • 53 Views
  • Uploaded on
  • Presentation posted in: General

Unit #1 Summary. LING 570 Fei Xia Week 4: 10/17/07. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A. Recap: formal grammars and languages. Formal language and formal grammar Chomsky hierarchy Other grammars and languages

Download Presentation

Unit #1 Summary

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Unit 1 summary

Unit #1 Summary

LING 570

Fei Xia

Week 4: 10/17/07

TexPoint fonts used in EMF.

Read the TexPoint manual before you delete this box.: AAA


Recap formal grammars and languages

Recap: formal grammars and languages

  • Formal language and formal grammar

    • Chomsky hierarchy

    • Other grammars and languages

  • The following are equivalent:

    • Regular language

    • Regular grammar

    • Regular expression

    • FSA (DFA and NFA)


Recap fsa

Recap: FSA

  • FSA and Extension of FSA

    • Probabilistic and weighted FSA

    • FST and weighted FST

  • Packages: AT&T, Carmel, NLTK

  • Applications of FSA / FST:

    • Morphological analyzer

    • ASR


Recap morphological analysis

Recap: morphological analysis

  • Three components:

    • Lexicon: book is a “regular” noun

    • Morphotactic rules: PL follows nouns

    • Orthographic rules: e-insertion, e-deletion


An example

An example

  • Task: foxes  fox +N +PL

  • Surface: foxes

  • Intermediate: fox s

  • Lexical: fox +N +pl

Orthographic rules

Lexicon + morphotactics


  • Login