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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.: A A A. Recap: formal grammars and languages. Formal language and formal grammar Chomsky hierarchy Other grammars and languages

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Unit #1 Summary

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  1. 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

  2. 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)

  3. 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 • …

  4. Recap: morphological analysis • Three components: • Lexicon: book is a “regular” noun • Morphotactic rules: PL follows nouns • Orthographic rules: e-insertion, e-deletion

  5. An example • Task: foxes  fox +N +PL • Surface: foxes • Intermediate: fox s • Lexical: fox +N +pl Orthographic rules Lexicon + morphotactics

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