知识图谱的构建与应用-朱小燕

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1、知识图谱的构建与应用清华大学计算机系朱小燕zxy-dcs@tsinghua.edu.cn,@朱小燕THU2014.4.18Contents1•Information&Knowledge2•Challenges3•Ideas&AchievementsInformation&KnowledgeWhatdoweusetheinternetfor?INFORMATIONSERVICEAccesstheInternetBuildknowledgeforgettingnews,graphforURL,etc.generatinganswersNewsMicr

2、oblogPictureVideoEncyclopediaForumInformationServices•BaiduBoxComputing•GoogleKnowledgeGraphKnowledge•Whatisknowledge?–Entity+Rule–Triple(predicate,semanticnetwork,rule,framework,……)AbstractedInformationDrawback:LackofabilitytoCodedInformationcommunicatewithmachineDIRECTLY!知识

3、的作用：帮助信息计算、理解、评价ChallengesScientificPerspective•OurGoal–InformationMeasurable–KnowledgeComputableMeasureMiningAcquisitionStructurizationInformation/KnowledgeApplicationPerspectiveInformationAcquisition•HowtomeasuretheinformationKnowledgeBase•Howtobuildknowledgebase–Tobuildfro

4、moriginalmaterials–Toextendandupdate–Tomergedifferencedatabases–Toverifytheknowledge•Howtouseknowledgebases–Foranswergeneration–Foranswerre-ranking–Forinference–Forrecommendation–Forverticalsearch–……IdeasandAchievementsKnowledgeBaseConstruction•KnowledgeBaseConstruction–Gener

5、alKnowledgeBaseConstruction–InformationOrganizationforMulti-sourceUGCs–DomainspecificKnowledgeBase•KeyPoints–Organizationwithsemanticinformation•TopicHierarchystructure–Practicability•Timeliness,IterativelyUpdate•Customization,QueryOrientedInformationOrganizationforMulti-sour

6、ceUGCsviaTopicHierarchyConstructionPowerOfStatistics:FindaTopic•Multi-sourceUGCs–Hugevolume&diversifiedtopics–ComplementaryQualityofContents:DescribeaTopicCanweorganizeMulti-sourceUGCsbyaunifiedstructure,•TopicHierarchywhichcaneffectivelyguideuserstotheirrequiredknowledge?–ro

7、otnode:usertopicpollpolicyIslam–non-rootnode:subtopics…–leafnode:linktoUGCs…mediccare…InformationOrganizationforMulti-sourceUGCsviaTopicHierarchyConstruction(cont.)•TopicExtractionBarackObamaPolicy–CandidateselectionviaMulti-sourcep=0.009basedVoterp=0.015p=0.013–Sub-topicrela

8、tionviaMulti-sourceevidencep=0.006learningandcombinationTaxDebate•To