Presentation of the LODatio system in the round of finalists at the Semantic Web Challenge (Billion Triples Track) at ISWC 2012

1. Get the Feeling!
Supporting Users in Finding Relevant Sources
of Linked Open Data at Web-Scale
Thomas Gottron, Ansgar Scherp, Bastian Krayer, Arne Peters

2. System Support for Searchers
System involvement
automatic Hold for later
execution
monitor and (skip)
recommend
Hold for
later
execute on Area of recommended
command development
Operational
Systems
display (then)
options
none Pure user activity
User activity
Bates, M.J.: Where should the person stop and the information search interface start?
Information Processing and Management 26(5), 575–591 (1990)
Get the Google Feeling Thomas Gottron BTC 2012 2

3. System Support Helps: Query Specific Snippets
Recall Precision
Speed Satisfaction
Tombros, A., Sanderson, M.: Advantages of query biased summaries in information retrieval.
SIGIR’98. pp. 2–10 (1998)
Get the Google Feeling Thomas Gottron BTC 2012 3

4. System Support Helps: Query Suggestions
of all queries were chosen from suggestions
Find entry point Think out of the box Identify new query terms
Kelly, D., et al. Effects of popularity and quality on the usage of query suggestions during
information search. CHI '10, p 45-54, (2010)
Get the Google Feeling Thomas Gottron BTC 2012 4

5. Get the Google Feeling Thomas Gottron BTC 2012 5

6. Did you mean?
Result Set Size
Ranked Retrieval
Result Snippets
Related Queries

7. Schema-based Index Design
Get the Google Feeling Thomas Gottron BTC 2012 7

8. „Under the hood“
SPARQL Generalize Select
Count
Query Retrieve
Rank
translation Datasources
Snippets
• 1 query for result set and result set size
• N queries for ranking data and snippets
Specify Select
• 2 queries per related query
Get the Google Feeling Thomas Gottron BTC 2012 8

9. Stats
 Use of the complete BTC 2012 dataset
 Index size
 133M schema triples
 224M payload triples
 Commodity hardware
 Data processing
 LODation service provision
 Index construction (15h) and optimization (5h)
 Response time: < 1s on a single CPU machine
Get the Google Feeling Thomas Gottron BTC 2012 9

10. Get the Feeling!
Thank you!