Danish and greek web search experiments with hummingbird SearchServerTM at CLEF 2005

Authors:
Stephen Tomlinson
Affiliations:
Hummingbird, Ottawa, Canada
Venue:
CLEF'05 Proceedings of the 6th international conference on Cross-Language Evalution Forum: accessing Multilingual Information Repositories
Year:
2005

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Mixed monolingual homepage finding in 34 languages: the role of language script and search domain

Information Retrieval
Current research issues and trends in non-English Web searching

Information Retrieval

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Abstract

Hummingbird participated in the WebCLEF mixed monolingual retrieval task of the Cross-Language Evaluation Forum (CLEF) 2005. In this task, the system was given 547 known-item queries from 11 languages (134 Spanish, 121 English, 59 Dutch, 59 Portuguese, 57 German, 35 Hungarian, 30 Danish, 30 Russian, 16 Greek, 5 Icelandic and 1 French). The goal was to find the desired page in the 82GB EuroGOV collection (3.4 million pages crawled from government sites of 27 European domains). Our experiments found that stopword processing was more important than anticipated, perhaps because words common in one language may tend to be overweighted by inverse document frequency in a mixed language collection. Extra weight on the document title helped significantly, and extra weight on less deep urls significantly helped home page queries. Stemming was of neutral impact on average, but it made a substantial difference for some individual queries. We analyze several Danish and Greek queries in detail.