1. Tutorial: Knowledge Bases for Web Content Analytics
Johannes Hoffart
Max Planck Institute for Inf.
Nicoleta Preda
University of Versailles
Fabian Suchanek
Télécom ParisTech Univ.
Gerhard Weikum
Max Planck Institute for Inf.

2. As for Fabian… I am a great fan of Elvis Presley!
Is Elvis still alive? 2

3. Bing
=> YES 3
ask>

4. Ask.com
=> YES 4

5. Google
=> NO 5

6. Wolfram Alpha 6

7. Wolfram Alpha: How do they know?
"Elvis Presley, the first and greatest American rock-and roll star, died yesterday at the age of 42." 7

8. A knowledge base Content Information analytics Extraction
this knowledge base, YAGO, as an example only
"Elvis Presley, the first and greatest American rock-and roll star, died yesterday at the age of 42." 8

9. Knowledge Bases: a Pragmatic Definition
For us, a knowledge base (KB) is a comprehensive semantically organized machine-readable collection of universally relevant or domain-specific entities, classes, and facts (attributes, relations)
plus spatial and temporal dimensions
plus commonsense properties and rules
plus contexts of entities and facts
(textual & visual witnesses, descriptors, statistics)
plus ….. 9

10. History of Digital Knowledge Bases
Cyc
 x: human(x) 
( y: mother(x,y) 
 z: father(x,z))
WordNet
guitarist  {player,musician}
 artist
from humans
for humans
from algorithms
for machines
Wikipedia
4.5 Mio. English articles
20 Mio. contributors
1985
1990
2000
2005
2010 10

11. Today's knowledge bases
> 60 Bio. subject-predicate-object triples from > 1000 sources
+ Web tables
Cyc
TextRunner/
ReVerb
WikiTaxonomy/
WikiNet
SUMO
ConceptNet 5
BabelNet
ReadTheWeb 11
Cloud diagram from
details>

12. Today's knowledge bases
Elvis Presley type American singer
Elvis Presley type Baritone
American singer subclassOf singer
Elvis Presley sang All Shook Up
Elvis Presley bornIn Tupelo
id11: Elvis Presley marriedTo Priscilla Presley
id11 validDuring [1967, 1977]
Elvis Presley „has twin brother“ Jesse Garon
Elvis Presley „possibly has origin“ Cherokee
Elvis Presley knownAs „The King of R&R“
taxonomic knowledge
factual knowledge
temporal knowledge
emerging knowledge
terminological knowledge 12
Cloud diagram from

13. Freely available knowledge bases
YAGO: yago-knowledge.org
Dbpedia: dbpedia.org
Freebase / Wikidata: freebase.com, wikidata.org
Entitycube: entitycube.research.microsoft.com
renlifang.msra.cn
NELL: rtw.ml.cmu.edu
DeepDive: deepdive.stanford.edu
Probase: research.microsoft.com/en-us/projects/probase/
KnowItAll / ReVerb: openie.cs.washington.edu
reverb.cs.washington.edu
BabelNet: babelnet.org
WikiNet:
ConceptNet: conceptnet5.media.mit.edu
WordNet: wordnet.princeton.edu
Linked Open Data: linkeddata.org 13

14. Use-Case: Internet Search14

15. Google Knowledge Graph
(Google Blog: „Things, not Strings“, 16 May 2012) 15

16. Use Case: Question Answering
This town is known as "Sin City" & its downtown is "Glitter Gulch"
question
classification &
decomposition
IBM Watson System
+ KBs
Las Vegas
[Ferrucci et al., AI Magazine 2010] 16
history>

17. Use Case: Analysis of History

18. Turn Web into Knowledge Base
more knowledge, analytics, insight
knowledge
acquisition
Web
Contents
Knowledge
intelligent
interpretation

19. This Tutorial Introduction Harvesting Classes Harvesting Facts
Common Sense Knowledge
Knowledge Consolidation
Web Content Analytics
Wrap-Up