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<Paper uid="C94-2134">
  <Title>Hypothesis Selection in Grammar Acquisition</Title>
  <Section position="7" start_page="840" end_page="840" type="concl">
    <SectionTitle>
5 Conclusion
</SectionTitle>
    <Paragraph position="0"> This paper l)rOl)osed l,eehuiques for selecting appropriate hyl)C/)these.s in (.he rule-hased l)roeessing stage Of grallllllar aeqllisitioll. The experinlents tt) (;X~Llnille the etl'eets o\[' these techniques indicate that (,hey have several advant;~ges * The newly introduced COllstraiuls reduce the nmnbet of hypotheses per sentence, from 26.0 1;o only 5.6, small enough to be treal;ed in a corpus-based processing enviromnent. This hyl~othesis selection is done without discarding plausilAe hypotheses. Although, all the initial hypotheses may be, in certain cases~ removed by the lle.W constraints, this hapl)ens only if no plansilAe hyl)othesis is inch,tied iu the ini tM set.</Paragraph>
    <Paragraph position="1"> * Even if no hylmthesis is generated from all unsuccessfully l)arsed sentence (20 out of 61 sentences ill experiment (el) or no plausible hypothesis is illeluded ill I, he initial hypothesis set (11 out of 41 sentences in experinmnt (el), a plausible hypothesis will be generated in the later acquisition cycle al: ter adding grammatical knowledge vital lot the sentenee~ null * Among the generated hypotheses, lexical hypotheses arc more Idausible than rule hypotheses (2a out of 30 plausible hypothese.s were lexical in expermmnt (el).</Paragraph>
    <Paragraph position="2"> This fact amahs l;hat the. grammar used R)r the experilnents has an almost sullieient set of rewriting rules and that, after t;he grammar reaches such a mature situat;ion during the acquisition cycle, only lexieal or idiosyncratic knowledge has to be added.</Paragraph>
    <Paragraph position="3"> As our method has a facility to hypothesize a lexical entry with it, s l~;aI, ure structure including a subcategorization frame, we can set the target of acquisition only to lexieal knowledge for a large dictionary.</Paragraph>
    <Paragraph position="4"> ,, '\['he loeaI boundary const;raint was introduced for automatie hypothesis selection, but it might also be used in an interactive debugging tool lbr grammar lllailltellanee.</Paragraph>
  </Section>
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