ExFaKT Ex plaining F acts over K nowledge Graphs & T ext Mohamed - PowerPoint PPT Presentation

ExFaKT Ex plaining F acts over K nowledge Graphs & T ext Mohamed H. Gad-Elrab Daria Stepanova Jacopo Urbani Gerhard Weikum MPI Informatics Bosch AI VU Amsterdam MPI Informatics WSDM 2019 11-15 February, Melbourne, Australia

Motivation: Constructing & Curating KGs NELL Automatic Fact Extraction Crowdsourcing Question Answering Entity Linking Reasoning 2 2

Motivation: Constructing & Curating KGs Automated Fact NELL Checking Automatic Fact Extraction Human Reviewers Fact Validation Crowdsourcing Question Answering Entity Linking Reasoning 3 3

Motivation: Fact Validation & Explanation Easy France World Cup won? DiCaprio Inception actedIn? 4 4

Motivation: Fact Validation & Explanation Easy Hard France World Cup Marissa Mayer Larry Page won? workedWith? DiCaprio Inception Stephen Hawking Paul Dirac actedIn? influencedBy? 5 5

Motivation: Fact Validation & Explanation Hard Marissa Mayer Larry Page workedWith? ● Did Mayer work at Google? ● Was she an early employee? ● Was she in management?.... etc Stephen Hawking Paul Dirac ● Who was Hawking doctoral advisor? influencedBy? ● Have they worked together? ● Has Hawking praised Dirac? ..etc 6 6

Motivation: Fact Validation & Explanation Hard Marissa Mayer Larry Page workedWith? ● Did Mayer work in Google? ● Was she an early employee? ● Or was she in the management?.... etc Stephen Hawking Paul Dirac ● Who was Hawking doctoral advisor? influencedBy? ● Have they worked together? ● ….. 7 7

ExFaKT “A framework for generating human-understandable explanations for candidate facts.” 8 8

ExFaKT Query: Hawking influencedBy Dirac ? Inference Rules KGs influencedBy(X,Y) ← hasAcademicAdvisor(X,Y); influencedBy(X,Y) ← scientist(X), wrote(X,Z), praises(Z,Y); Textual Web Sources ExFaKT 9 9

ExFaKT Query: Hawking influencedBy Dirac ? Inference Rules KGs influencedBy(X,Y) ← hasAcademicAdvisor(X,Y); influencedBy(X,Y) ← scientist(X), wrote(X,Z), praises(Z,Y); Textual Web Sources ExFaKT Explanations KG: Explanations wrote(Hawking, “Dirac: The Man and His Work, 1998”); scientist(Hawking); Text: KG: “Dirac has done more than anyone this century, with the exception of Einstein...” 10 10

Experiments Text KGs Rules and/or Extracted Rules Human-crafted Rules Usefulness of the Explanations? User Study Automatic Fact-checking 11 11

ExFaKT Visit our poster! https://www.mpi-inf.mpg.de/impact/exfakt 12 12