CLEF-2005 CL-SR at Maryland: Document and Query Expansion Using Side Collections and Thesauri Jianqiang Wang and Douglas W. Oard College of Information.

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Presentation transcript:

CLEF-2005 CL-SR at Maryland: Document and Query Expansion Using Side Collections and Thesauri Jianqiang Wang and Douglas W. Oard College of Information Studies and UMIACS University of Maryland, USA Track: CL-SR

Techniques and results Document expansion using side collections 24% (significant) improvement on the training set 6% (insignificant) improvement on the evaluation set Parameter tuning is important Keyword “synonym” expansion using thesauri Marginal (insignificant) improvement on the training set Query expansion using blind relevance feedback 45% (significant) improvement on CLIR with ASR text Marginal (insignificant) improvement on searching metadata Parameter tuning could be productive Corpus-based CLIR 674,247 sentence aligned corpus (Europarl) One-best French-to-English query translation 79% monolingual mean average precision

In ASROnly in (Segments: ASR / Metadata)Metadata jewsvolkswagen witnesseichmann sobibor(5/13) death camp holocaustsinti roma slave labortelefunken labor campsig farben art auschwitz minsk(21/71) ghetto underground abusive female(8/81) personnel wallenberg(3/16)eichmann wallenberg(3/16) rescue jews fort ontario refugee camp jewish nurses concentration camps war crime trial participants french internment camps post liberation experience birkenau daily life sonderkommando jewish gentile relations poland sonderkommando auschwitz liberation buchenwald dachau jewish kapos kindertransport decision migration australia flight denmark sweden dp camps american zone rescue danish children persecution jews italy kindertransport possessions red cross holocaust jews shanghai bulgaria saved jews Error Analysis