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Jiří Materna, Head of Research The Czech number one Internet company Seznam.cz.

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Presentation on theme: "Jiří Materna, Head of Research The Czech number one Internet company Seznam.cz."— Presentation transcript:

1 Jiří Materna, Head of Research The Czech number one Internet company Seznam.cz

2 www.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 Google maps) Sklik.cz (advertising system) And others… What is Seznam.cz @JiriMaterna

3 www.seznam.cz More than 1000 employees Revenue 2.8 billion CZK (108 mil. EUR) 2.4 million people visit Seznam.cz every day 1.5 billion crawled web pages -- 45 % English -- 37 % Czech -- 7.7 % Slovak -- 2.3 % German -- 8 % Others 500 queries per second in peak hours Seznam.cz in numbers @JiriMaterna

4 www.seznam.cz Search engine architecture @JiriMaterna

5 www.seznam.cz Query understanding Graph representation: - AND - OR - optional - other relations Query Expander @JiriMaterna

6 www.seznam.cz Search aggregators @JiriMaterna Deduplication Document sub-results SERP restrictions Caching

7 www.seznam.cz RC-Rank – Boosted regression oblivious trees Hundreds of features Our own quality measure Ranking @JiriMaterna

8 www.seznam.cz Index & Indexer @JiriMaterna Indexing: complete, daily, fresh Data structures: word barrel – stores the inverted index document barrel – stores document features title barrel – stores processed web pages content and metadata others – query site barrel, site barrel, link barrel, qds barrel, query url barrel, …

9 www.seznam.cz Hadoop, Giraffe, Yarn 50 mil. documents every day 1.5 bil. documents out of 50 bil. known documents stored duplicity detection Downloader & document database @JiriMaterna

10 www.seznam.cz Joint projects Providing our technology Sharing data (MetaCentrum) … Possible models of cooperation @JiriMaterna

11 www.seznam.cz Jiří Materna, Head of Research, jiri.materna@firma.seznam.cz Thank you for your attention. @JiriMaterna

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