Seznam.cz - Living Labs

Seznam.cz
Living Labs for Information Retrieval
Jiří Materna, Head of Research
What is Seznam.cz
Internet portal with tens of high-quality services:
•  Web search (web search engine successfully competing with Google)
•  Specialized search (Czech companies, e-shops)
•  E-mail (the most popular free e-mail in the Czech market)
•  News (covering business, politics, lifestyle, sport, whether, TV schedules, etc.)
•  Entertainment (video and music online streaming)
•  On-line maps (more detailed than our competition)
•  Sklik.cz (advertising system)
•  And others…
www.seznam.cz
@JiriMaterna
Seznam.cz in numbers
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More than 1100 employees
Revenue 2.8 billion CZK (108 mil. EUR)
2.4 million people visit Seznam.cz every day
3 billion crawled web pages
-- 45 % English
-- 37 % Czech
-- 7.7 % Slovak
-- 2.3 % German
-- 8 % Others
•  500 queries per second in peak hours
www.seznam.cz
@JiriMaterna
What makes Seznam.cz
successful
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Many interconnected services
Knowledge of the Czech language and needs
Technology
(Tradition)
www.seznam.cz
@JiriMaterna
Team-draft Interleaving
A B Interleaved 1 2 2 3 3 1 2 4 3 5 5 4 6 + 10 = 5 8 1 10 7 7 7 9 11 6 10 12 12 14 13 8 www.seznam.cz
@JiriMaterna
Delta preference
www.seznam.cz
@JiriMaterna
Team-draft interleaving in Seznam
www.seznam.cz
@JiriMaterna
Data
•  100 training + 100 testing queries
(frequent, informational, non-commercial)
•  100 documents for each query
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features
Clicks
Session ID
Timestamp
www.seznam.cz
@JiriMaterna
Continuous improvement
www.seznam.cz
@JiriMaterna
Statistics
… www.seznam.cz
@JiriMaterna
Why do we participate?
www.seznam.cz
@JiriMaterna
Thank you for your attention.
Jiří Materna, Head of Research, [email protected]
www.seznam.cz
@JiriMaterna