© 2000 Todd Neller.
A.I.M.A. t
ext
figures
© 1995 Prentice Hall.
Used by
permission.
PCFG Approximations
•
Tradeoff between:
–
Context sensitivity:
•
"I has", "man have" – subject-verb agreement
•
"I, for one, has…" "man over there have"
–
Memory, acquisition of sufficient training
examples
•
Compromise: weighted sum of unigram,
bigram, and trigram models
