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Aidan's PhD Viva

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Aidan Hogan
Aidan Hogan

Slide's of Aidan's PhD defense.

Tecnologia
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Exploiting RDFS and OWL for Integrating Heterogeneous, Large-Scale, Linked Data Corpora Aidan Hogan PhD Viva
Cold Open Figure 1: Web of Data explicit data implicit data Topic of thesis: How can consumers tap into the implicit data
[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],
,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],… the micro … Linked Data Principles
… the macro … A Web of Data Images from: http://richard.cyganiak.de/2007/10/lod/ ; Cyganiak, Jentzsch September 2010 August 2007 November 2007 February 2008 March 2008 September 2008 March 2009 July 2009
[object Object],[object Object],
Take Query Answering … ,[object Object],[object Object],
Take Query Answering … Gimme webpages relating to Tim Berners-Lee foaf:page timbl:i timbl:i foaf:page ?pages .
Hetereogenity in terminology … webpage: properties foaf:page foaf:homepage foaf:isPrimaryTopicOf foaf:weblog doap:homepage foaf:topic foaf:primaryTopic mo:musicBrainz mo:myspace … = rdfs:subPropertyOf = owl:inverseOf
Linked Data, RDFS and OWL: Linked Vocabularies … … Image from http://blog.dbtune.org/public/.081005_lod_constellation_m.jpg : ; Giasson, Bergman
Hetereogenity in naming … Tim Berners-Lee: URIs … timbl:i dblp:100007 identica:45563 adv:timbl fb:en.tim_berners-lee db:Tim-Berners_Lee = owl:sameAs
Returning to our Query … Gimme webpages relating to Tim Berners-Lee foaf:page timbl:i timbl:i foaf:page ?pages . ... 7 x 6 = 42 possible patterns foaf:homepage foaf:isPrimaryTopicOf doap:homepage foaf:topic foaf:primaryTopic mo:myspace dblp:100007 identica:45563 adv:timbl fb:en.tim_berners-lee db:Tim-Berners_Lee
[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],
Linked Data Reasoning: Challenges Scalable Expressive Robust Domain-Agnostic
[object Object],[object Object],[object Object],[object Object],
[object Object],
[object Object],[object Object],
,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Web Reasoning: Forward Chaining! One size does not fit all! Don't materialise too much!
[object Object], Our Approach
Our Approach… ,[object Object],[object Object],[object Object],[object Object]
Scalable Reasoning: In-mem T-Box ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object], Scalable Reasoning: Two Scans
... ex:me foaf:homepage ex:hp . ... ... ex:hp rdf:type foaf:Document . ex:me foaf:page ex:hp . ex:hp foaf:topic ex:me . ... IN-MEM T-BOX ON-DISK A-BOX ON-DISK OUTPUT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Scalable Reasoning: No A-Box Joins
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Scalable Reasoning: A-Box joins?
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Authoritative Reasoning
Survey of terminology: counts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Survey of terminology: counts
Survey of terminology: ranks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object], Survey of terminology: ranks
[object Object],
Scalable Distributed Reasoning ... ... ex:me ex:presented ex:ThisTalk ... SAME T-BOX SAME T-BOX SAME T-BOX SAME T-BOX SAME T-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... LOCAL OUTPUT ... ... ex:me ex:presented ex:ThisTalk ... LOCAL OUTPUT LOCAL OUTPUT LOCAL OUTPUT LOCAL OUTPUT ... ... ex:me ex:presented ex:ThisTal ... ... ex:me ex:presented ex:ThisTalk ... ... ex:me ex:presented ex:ThisTalk ... ... ex:me rdf:type ex:Awesome . ... ... ... ... ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX ... ...
Reasoning Performance (1 machine)
Reasoning Performance: Distrib. ,[object Object],
Reasoning: Results 962 million unique/novel triples 947 million unique triples
[object Object],[object Object],
Annotated Reasoning ,[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object], Annotated Reasoning: ranks
[object Object],[object Object],[object Object],[object Object],[object Object], Annotated Reasoning
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Why?
[object Object], Inconsistencies: aka. Contradictions
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Cannot compute…
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Fixing inconsistencies
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Fixing inconsistencies
[object Object],[object Object], Inconsistencies found
Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],
Consolidation for Linked Data
[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Consolidation: Baseline ,[object Object],[object Object],[object Object]
[object Object], Consolidation: Baseline ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object], Canonicalisation timbl:i rdf:type foaf:Person . identica:48404 foaf:knows identica:45563 . dbpedia:Berners-Lee dpo:birthDate “ 1955-06-08”^^xsd:date . dbpedia:Berners-Lee rdf:type foaf:Person . identica:48404 foaf:knows dbpedia:Berners-Lee . dbpedia:Berners-Lee dpo:birthDate “ 1955-06-08”^^xsd:date . ,[object Object],[object Object],[object Object]
Baseline Consolidation: Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Baseline Consolidation: Results
[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Extended Consolidation
[object Object],[object Object],[object Object],[object Object], Derive owl:sameAs on-disk
Extended Consolidation: Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Extended Consolidation: Results
[object Object],
timbl:i foaf:page ?pages . ,[object Object],[object Object],[object Object],dbpedia:Berners-Lee foaf:page ?pages .
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Conclusions

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Aidan's PhD Viva

  • 1. Exploiting RDFS and OWL for Integrating Heterogeneous, Large-Scale, Linked Data Corpora Aidan Hogan PhD Viva
  • 2. Cold Open Figure 1: Web of Data explicit data implicit data Topic of thesis: How can consumers tap into the implicit data
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  • 6. … the macro … A Web of Data Images from: http://richard.cyganiak.de/2007/10/lod/ ; Cyganiak, Jentzsch September 2010 August 2007 November 2007 February 2008 March 2008 September 2008 March 2009 July 2009
  • 7.
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  • 9. Take Query Answering … Gimme webpages relating to Tim Berners-Lee foaf:page timbl:i timbl:i foaf:page ?pages .
  • 10. Hetereogenity in terminology … webpage: properties foaf:page foaf:homepage foaf:isPrimaryTopicOf foaf:weblog doap:homepage foaf:topic foaf:primaryTopic mo:musicBrainz mo:myspace … = rdfs:subPropertyOf = owl:inverseOf
  • 11. Linked Data, RDFS and OWL: Linked Vocabularies … … Image from http://blog.dbtune.org/public/.081005_lod_constellation_m.jpg : ; Giasson, Bergman
  • 12. Hetereogenity in naming … Tim Berners-Lee: URIs … timbl:i dblp:100007 identica:45563 adv:timbl fb:en.tim_berners-lee db:Tim-Berners_Lee = owl:sameAs
  • 13. Returning to our Query … Gimme webpages relating to Tim Berners-Lee foaf:page timbl:i timbl:i foaf:page ?pages . ... 7 x 6 = 42 possible patterns foaf:homepage foaf:isPrimaryTopicOf doap:homepage foaf:topic foaf:primaryTopic mo:myspace dblp:100007 identica:45563 adv:timbl fb:en.tim_berners-lee db:Tim-Berners_Lee
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  • 20. Linked Data Reasoning: Challenges Scalable Expressive Robust Domain-Agnostic
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  • 37. Scalable Distributed Reasoning ... ... ex:me ex:presented ex:ThisTalk ... SAME T-BOX SAME T-BOX SAME T-BOX SAME T-BOX SAME T-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX DIFF. A-BOX ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... LOCAL OUTPUT ... ... ex:me ex:presented ex:ThisTalk ... LOCAL OUTPUT LOCAL OUTPUT LOCAL OUTPUT LOCAL OUTPUT ... ... ex:me ex:presented ex:ThisTal ... ... ex:me ex:presented ex:ThisTalk ... ... ex:me ex:presented ex:ThisTalk ... ... ex:me rdf:type ex:Awesome . ... ... ... ... ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... ... ... ex:me ex:presented ex:ThisTalk ... EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX EXTRACT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX COLLECT T-BOX ... ...
  • 38. Reasoning Performance (1 machine)
  • 39.
  • 40. Reasoning: Results 962 million unique/novel triples 947 million unique triples
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