Séminaires RALI-OLST

Selecting Good Query Term Alterations for Web Retrieval

Guihong Cao (caogui <at> iro (point) umontreal (point) ca)

RALI, DIRO

Le mercredi 28 mai 2008 à 11 h 30

Salle 3195, Pavillon André-Aisenstadt


Query expansion by word alterations (alternative forms of a word) is often used in Web search to replace word stemming. This allows users to specify particular word forms in a query. However, if many alterations are added, query traffic will be greatly increased. In this paper, we propose methods to select only a few useful word alterations for query expansion. The selection is made according to the appropriateness of the alteration to the query context (using a bigram language model), or according to its expected impact on the retrieval effectiveness (using a regression model). Our experiments on two TREC collections will show that both methods only select a few expansion terms, but the retrieval effectiveness can be improved significantly.


Pour recevoir les annonces hebdomadaires par courriel, envoyez un message à l'adresse majordomo@iro.umontreal.ca. Il suffit d'envoyer un message ne contenant que la ligne 'subscribe ralli' (sans les apostrophes, avec un double 'l' dans 'ralli').

Liste de tous les séminaires pour l'année :

1991 1992 1993 1994 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022