The aims of this paper are twofold. Our first aim is to compare results of the earlier Terabyte tracks to the Million Query track. We submitted a number of runs using different document representations (such as full-text, title-fields, or incoming anchor-texts) to increase pool diversity. The initial results show broad agreement in system rankings over various measures on topic sets judged at both Terabyte and Million Query tracks, with runs using the full-text index giving superior results on all measures, but also some noteworthy upsets. Our second aim is to explore the use of parsimonious language models for retrieval on terabyte-scale collections. These models are smaller thus more efficient than the standard language models when used at indexing time, and they may also improve retrieval performance. We have conducted initial experiments using parsimonious models in combination with pseudo-relevance feedback, for both the Terabyte and Million Query track topic sets, and obtained promising initial results.
|Title of host publication||The Sixteenth Text REtrieval Conference (TREC 2007) Proceedings|
|Place of Publication||Washington, DC|
|Publisher||National Institute of Standards and Technology|
|Number of pages||7|
|Publication status||Published - 2008|
|Event||16th Text REtrieval Conference, TREC 2007 - Gaithersburg, United States|
Duration: 6 Nov 2007 → 9 Nov 2007
Conference number: 16
|Name||NIST Special Publication|
|Publisher||US National Institute of Standards and Technology (NIST)|
|Conference||16th Text REtrieval Conference, TREC 2007|
|Period||6/11/07 → 9/11/07|
Hiemstra, D., Kamps, J., Kaptein, R., & Li, R. (2008). Parsimonious Language Models for a Terabyte of Text. In The Sixteenth Text REtrieval Conference (TREC 2007) Proceedings (pp. 64). (NIST Special Publication; Vol. 500-274). Washington, DC: National Institute of Standards and Technology.