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Lexical Knowledge Structures

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<strong>Lexical</strong> <strong>Knowledge</strong> Networks<br />

Cyc project, started 1984 by Doug Lenat<br />

Goal is to capture all facts that the average person knows.<br />

350 man-years of effort estimated<br />

ConceptNet, started 1999, by MIT Media Lab<br />

In 2000 become a World Wide Web collaborative project.<br />

By 2004 had 300 000 concepts and 1.6 million relations.<br />

English WordNet, started 1985, by direction of George A.<br />

Miller<br />

<strong>Lexical</strong> database that could be searched conceptually.<br />

YAGO ontologies 2007<br />

Combines WordNet and Wikipedia.<br />

Made by crawling Wikipedia in January 2007.<br />

VerbOcean<br />

Contains relations between verbs.<br />

Relations captured semi-automatically.<br />

A K Nirala<br />

<strong>Lexical</strong> <strong>Knowledge</strong> <strong>Structures</strong>

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