Explaining away ambiguity
Massimiliano Ciaramita, Mark S. Johnson · 2000
This t)at)er presents a Bayesian lnodel for unsut)(;rvised learning of v(;rb s(;le(-t;ional t)refer(;nc('s.For each vert) the model creates a 13~Wo.siann(~twork whose archii;e(:lan '(~ is (l(fl;(wmin(;d t).5' the h',xical hicr~m:hy of W()r(hmt mtd whos('~ 1)ar~mmt;(;rs are ('~sl;im;~l:(~d from a list; of v('d'l)ol)je('t pairs ]'cram from a tort)us."lgxl)laining away", t~ well-known t)rop('xi;y of Baycsi~m networks, helps the moth;1 (teal in a natural fashion with word sense aml)iguity in tlw, training (tat~L.()n a, word sense disamt)igu;~tion Lest our model t)erformed l)ctl;c,r than ot;h(',r stal;(~ of tim art systems for unSUl)crvis(~d learning ()t7 seh'x:-tionM t)r(d'er(mces.Coml)utational (:Oml)lcxity l)rol)lems, wn.ys of improving tiffs ;tl)l)roa(:h mM methods for iml)h'menting "('xt)laining away" in oth(;r graphical frameworks are dis('ussed. 1 Selectional preference and sense ambiguity R('.gularil;i('~s of avcrt) with rcsl)e(:t to t;lw.semantic class of its m:guments (sul)j('.cl:,ol)j('.(:l;mM indirect o])je(:l;) arc called selectional preferenees (S1)) (Katz and Fodor, 1964; Chomsky, 1965; Johnson-Laird, 1983).The verb pilot car-ries the information thal; its ol)jecl; will likely 1)e some kind of veh, icle; sut)jects of tim vert) th, int,: t(md to 1)e h,'uman; ;rod sul)jects of the verb bark l;end l;o l)c, dogs.For the sake of simt)licity we will locus on the verl)-ot)je(:t relation all;hough the techniques we will describe can be at)t)li(;d to other verb-argument pairs.* We wouhl like to ttmnk the Brown Lal)orat;ory for Linguistic Inibrmation Processing; Thomas IIoflnann; Elie Bienenstoek; 1)hilip Resnik, who provided us with training and test data; and Daniel Oarcia for his hel l) with the SMILE lil)rary of (:lasses tbr Bayesian networks that we used for our exl)eriments.This research was SUl)l)orted 1)y NSF awards 9720368, 9870676 and 9812169. .EN77TY._ ,vomet]tiug -" ~ , "-.. " ~ ,~ .