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Knowledge Representation - Cognitive Science at Northwestern知识表示在西北认知科学.ppt


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KnowledgeRepresentationPraveenParitoshCogSci207:Fall2003:Week1Thu,Sep30,2004SomeRepresentationsElementsofaRepresentationRepresentedworld:aboutwhat?Representingworld:usingwhat?Representingrules:howtomap?Processthatusestherepresentation:’putational:putation,whyisitappropriate,andwhatisthelogicofthestrategybywhichitcanbecarriedout?Algorithmic:putationaltheorybeimplemented?Inparticular,whatistherepresentationfortheinputandoutput,andwhatisthealgorithmforthetransformation?Implementation:Howcantherepresentationandalgorithmberealizedphysically?Marr’slevelsofdescription–2Computational:alotofcognitivepsychologyAlgorithmic:alotofcognitivescienceImplementation:neuroscienceAcloserlookOverviewHowknowledgerepresentationworksBasicsoflogic(connectives,modeltheory,meaning)BasicsofknowledgerepresentationWhyuselogicinsteadofnaturallanguage?anizinglargeknowledgebasesOntologyMicrotheoriesResource:(s)LearningMechanism(s)Examples,StatementsQuestions,requestsAnswers,analysesWhat’sintheknowledgebase?(akaaxioms)thatdescribewaystoinfernewfactsfromexistingfactsAlltriangleshavethreesidesAllelephantsaregreyFactsandrulesarestatedinaformallanguageGenerallysomeformoflogic(akapredicatecalculus)

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