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Functional Manipulation of Large Data Graphs
David Hyland-Wood [email protected]
@prototypo 1 June 2016
Something Something elsea relationship
UQ Universityis a
UQ
The University of Queensland
label
Universityis a
Group of 8
affiliation
We’ve Seen This Before
08 Oct 2007
The RDF Data Model
• Turtle • TriG • N-Triples • N-Quads • JSON-LD • RDFa • RDF/XML
Standard serialisation formats:
}Turtle family of RDF formats
Possibly lossy alternatives:
• CSV • ODATA • etc
$ curl http://dbpedia.org/page/University_of_Queensland
$ curl http://dbpedia.org/data/University_of_Queensland
$ curl http://dbpedia.org/data/University_of_Queensland.n3 > University_of_Queensland.n3
https://en.wikipedia.org/wiki/University_of_Queensland
HTML
RDF in XML (Yuck!)
Many formats, e.g. sane RDF, ODATA, Microdata, JSON…
UQ
The University of Queensland
label
affiliationGroup of 8
34228
number of undergraduate students
48771
number of students
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/>select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergradswhere { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> .?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name .OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students}OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads}FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" )} ORDER BY DESC (?students)
# G8 universities ordered by the number of students # at each university. PREFIX dbo:<http://dbpedia.org/ontology/> select ?name ?students ?undergrads where { ?s dbo:affiliation <http://dbpedia.org/resource/Group_of_Eight_(Australian_universities)> . ?s rdfs:label ?name . OPTIONAL {?s dbo:numberOfStudents ?students} OPTIONAL {?s dbo:numberOfUndergraduateStudents ?undergrads} FILTER ( lang(?name) = "en" ) } ORDER BY DESC (?students)
OpenStreetMap
Wikimedia Commons
DBpedia
US EPA RCRA
US EPA FRS
ABT Associates
UQ
The University of Queensland
label
ANU
Australian National University
label
Monash
affiliationUMelbourne
affiliation
UNSW
affiliation
USydney
affiliation
UAdelaideaffiliation
Go8
memberOf memberOf
memberOfmemberOf
memberOf
memberOf
memberOf
University of Melbourne
label
Monash University
label
University of Adelaide
label
Group of 8label
University of Sydney
label
Universityof NSW
label
UQ
The University of Queensland
label
ANU
Australian National University
label
Monash
affiliation
UMelbourne
affiliation
UNSW
affiliation
USydney
affiliation
UAdelaide
affiliation
Graphs in Scalaval graph: Graph[String, String] = Graph(vertexRDD, edgeRDD)
// Create a subgraph based on the vertices connected // by an "affiliation" property. val affiliationRelatedSubgraph = graph.subgraph(t => t.attr == "http://dbpedia.org/ontology/affiliation")
// Find connected components of affiliationRelatedSubgraph. val ccGraph = affiliationRelatedSubgraph.connectedComponents()
Graphs in Scala// Create a hashmap of componentLists. affiliationRelatedSubgraph.vertices.leftJoin (ccGraph.vertices) { case (id, u, comp) => comp.get }.foreach { case (id, startingNode) => { if (!(componentLists.contains(startingNode))) { componentLists(startingNode) = new ListBuffer[VertexId] } componentLists(startingNode) += id } }
Graphs in Scala// Output a report on the connected components. println("------ connected components in related triples ------\n") for ((component, componentList) <- componentLists){ if (componentList.size > 1) { for(c <- componentList) { println(labelMap(c)); } println("--------------------------") } }
------ connected components in related triples ------
Australian National University University of Sydney University of Adelaide University of New South Wales -------------------------- The University of Queensland University of Melbourne Monash University --------------------------
Resources
• Slides: http://w3id.org/people/prototypo/talks/UQ-DKE-20160601/slides
• Code: http://w3id.org/people/prototypo/talks/UQ-DKE-20160601/code
Resources
• Callimachus: http://callimachusproject.org
• Apache Spark: http://spark.apache.org
• GraphX Programming Guide: http://spark.apache.org/docs/latest/graphx-programming-guide.html
Attributions
• Linking Open Data cloud diagram by Richard Cyganiak and Anja Jentzsch, used under a CC license: http://lod-cloud.net/
This work is Copyright © 2015 David Hyland-Wood It is licensed under the Creative Commons Attribution 3.0 Unported LicenseFull details at: http://creativecommons.org/licenses/by/3.0/
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