Information Extraction: Learning Lexico-Syntactic PatternsAutoslog-TS, Riloff, AAAI ‘96

• Start with known relevant articles

• Extract noun phrases

• Create huge set of patterns of form:

  • <subj> passive-verb <victim> was murdered
  • active-verb <dobj> bombed <target>

• Compute relevance rate:

  • Pr(relevant text|text has patterni) = rel - freqi / total - freqi

• Rank patterns in order of importance

  • relevance rate * log2(freqi), rr > 0.5

• Human judge reviewed top patterns

• Apply all patterns to each text

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