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Seznam.cz

Seznam.cz. The Czech number one Internet company. Ji ří 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)

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Seznam.cz

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

  2. 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 Google maps) Sklik.cz (advertising system) And others… @JiriMaterna

  3. Seznam.cz in numbers 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 @JiriMaterna

  4. Search engine architecture @JiriMaterna

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

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

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

  8. Index & Indexer 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, … @JiriMaterna

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

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

  11. Jiří Materna, HeadofResearch, jiri.materna@firma.seznam.cz Thank you for your attention. @JiriMaterna

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