Hacktoberfest 2020 - Intro to Knowledge Graphs
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The document introduces knowledge graphs, graph databases, and their concepts such as RDF and OWL, emphasizing their use cases in various fields like recommendation engines and natural language processing. It defines a knowledge graph as a structured collection of data from multiple sources that improves accessibility and inference of new knowledge. Additional resources for learning about graph databases and knowledge graphics are also provided.
Hacktoberfest 2020 - Intro to Knowledge Graphs
- 1. Intro to Knowledge Graphs Chris Woodward
- 2. 2 Chris Woodward Developer Relations Engineer @ ● Training ● Development ● Community ● Twitter: @cw00dw0rd ● Slack: Chris.ArangoDB
- 3. Special Guest reKnowledge David Costa Faidella
- 4. Topics ● What is a graph database? ● What is a knowledge graph? ● Knowledge Graph concepts ○ RDF, OWL, TTL, etc. ● Interactive Notebook
- 5. Graph Database Simply put, a graph database consists of documents that describe relations within data
- 6. Graph Database ● NoSQL ● Vertex and Connecting Edge Documents ● Directed or Undirected ● Property Labels
- 8. Use Cases ● Recommendation Engines ● Social Networks ● Knowledge Bases ● Machine Learning ● Fraud Detection ● Many more!
- 9. Use Cases Graph Course for Freshers: https://www.arangodb.com/arangodb-graph- course/
- 10. Graph Resources ● Graph Course for Freshers: ○ https://www.arangodb.com/arangodb-graph-course/ ● What is a Graph Database? ○ https://www.arangodb.com/graph-database/ ● ArangoDB Training Center ○ https://www.arangodb.com/arangodb-training-center/ ● Getting Started with ArangoDB on Udemy ○ https://www.udemy.com/getting-started-with-arangodb/
- 11. Knowledge Graphs ● Introduce Concepts ● Review Modelling ● Define Ontology ● Notebook ● reKnowledge example KG!
- 12. What is a Knowledge Graph?
- 13. What is a Knowledge Graph? A basic definition of a knowledge graph is that it collects the data from multiple graphs and attempts to implement a uniform ontology, making the graph data more accessible.
- 14. What is a Knowledge Graph? Wikipedia: A network of entities, their semantic types, properties, and relationships. https://en.wikipedia.org/wiki/Knowledge_graph#Definitions
- 15. Why Knowledge Graphs? ● Make data more accessible ● Infer new knowledge from data
- 16. Use Cases ● Natural Language Processing ● Enterprise Knowledge Graphs ● Customer 360 ● Compliance
- 17. Semantic Web ● Linked Data ● Vocabularies ● Inference ● Query ● Vertical Applications https://www.w3.org/standards/semanticweb/
- 18. Knowledge Graphs
- 19. Knowledge Graphs
- 20. Wikidata vs Wikipedia ● Flexibility requirements ● Knowledge Graph vs Encyclopedia ● Machine Readable vs Human Readable
- 21. Wikidata vs DBpedia ● Wikidata schema vs OWL derived schema ● Wikidata model vs RDF based ● DBpedia is Semantic Web focused
- 22. Modelling ● RDF ● XML ● Triples ● OWL
- 23. Modelling - RDF ● Resource Description Framework “The core structure of the abstract syntax is a set of triples, each consisting of a subject, a predicate and an object…” https://www.w3.org/TR/rdf11-concepts/
- 24. Modelling - SPO ● Subject ● Predicate ● Object
- 25. RDF Resource ..A resource may be a part of a Web page; e.g. a specific HTML or XML element within the document source. A resource may also be a whole collection of pages; e.g. an entire Web site. A resource may also be an object that is not directly accessible via the Web; e.g. a printed book...
- 26. RDF Resource ● Uniform Resource Identifier (URI): compact sequence of characters that identifies an abstract or physical resource ● Internationalized Resource Identifier (IRI): Generalized URI with better Unicode support ● Uniform Resource Locator (URL): URI/IRI with additional access information, protocol, etc.
- 27. Modelling - Subject Subject of the expression or statement
- 28. Modelling - Predicate The part of a sentence or clause containing a verb and stating something about the subject
- 29. Modelling - Object The item the subject is acting upon or relating to.
- 30. Modelling - End Statement The period indicates the end of the statement.
- 31. Modelling - SPO ● Subject - <http://dbpedia.org/resource/Arthur_Conan_Doyle> ● Predicate - <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> ● Object - <http://www.w3.org/2002/07/owl#Thing>
- 32. Modelling - Serializing ● XML ● Turtle (ttl) ● N-triples (nt) ● N-quads (nq) ● JSON
- 33. Ontology - W3 ...Vocabularies are used to classify the terms that can be used in a particular application, characterize possible relationships, and define possible constraints on using those terms… https://www.w3.org/standards/semanticweb/ontolo gy
- 34. Ontology - Wikipedia In computer science and information science, an ontology encompasses a representation, formal naming and definition of the categories, properties and relations between the concepts, data and entities that substantiate one, many or all domains of discourse.
- 35. OWL The W3C Web Ontology Language (OWL) is a Semantic Web language designed to represent rich and complex knowledge about things, groups of things, and relations between things. https://www.w3.org/OWL/
- 38. Thank you!