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Overview of theTREC 2009 Blog Track,[object Object],Iadh Ounis, Craig Macdonald, Ian Soborofftrecblog-organisers@dcs.gla.ac.uk,[object Object],1,[object Object]
Outline,[object Object],Blog Track: Background,[object Object],TREC Blog Track 2009 Overview,[object Object],[object Object]
Faceted blog distillation task
Top stories identification taskConclusions,[object Object],2,[object Object]
Blog Track @ TREC,[object Object],Introduced in TREC 2006,[object Object],[object Object],The Blog track adopted an incremental approach,[object Object],[object Object],Thus far, two main search tasks have been addressed:,[object Object],[object Object],“Find meposts about what people think of X”,[object Object],[object Object],“Find me blogswith a principle, recurring interest in X” ,[object Object],3,[object Object]
Blog Track 2009,[object Object],In 2009, the Blog track has been markedly revamped,[object Object],[object Object],An up-to-date sample of the blogosphere: Blogs08,[object Object],[object Object]
A much longer timespan: 13 months from Jan 08 to Feb 09Two new search tasks:,[object Object],[object Object],Addresses the quality aspect of the retrieved blogs,[object Object],[object Object],Addresses the news-related dimension of the blogosphere,[object Object],4,[object Object]
The New Blogs08 Collection,[object Object],Crawled from the blogosphere over a 13-month period from 14th  Jan 08 to 10th Feb 09,[object Object],[object Object],Facilitates addressing the temporal/chronological aspect of the blogosphere,[object Object],[object Object],Follow a similar structure to the older Blogs06 collection:,[object Object],[object Object]
1445GB permalinks (28M documents)A single post and its comments ,[object Object],[object Object],Created by the Univ. of Glasgow and distributed since April 2009,[object Object],5,[object Object]
Outline,[object Object],Blog Track: Background,[object Object],TREC Blog Track 2009 Overview,[object Object],[object Object]
Faceted blog distillation task
Top stories identification taskConclusions,[object Object],6,[object Object]
Blog Distillation Task ,[object Object],Blog search users often wish to identify blogs about a given topic,[object Object],[object Object],Filtering: Subscribe to a repeated search in their RSS reader,[object Object],Distillation: add blog feeds with a recurring central interest to their RSS reader,[object Object],Blog distillation task  [2007-2008],[object Object],[object Object],The TREC 2007 and 2008 incarnations focused on topical relevance,[object Object],[object Object],7,[object Object]
Faceted Blog Search,[object Object],New task mimics an exploratory search task,[object Object],[object Object]
Quality aspect is addressed through the use of facets in the search interface (Hearst et al., SSM 2008)Faceted search allows the users to explore the attributes of those blogs they might wish to follow and read:,[object Object],[object Object]
Humouristic/serious style
Expert/novice viewpoint
etc.8,[object Object]
Task Definition,[object Object],For operationalising at TREC ,[object Object],[object Object]
Blogs do not have facet attributesFor TREC 2009, we used an initial set of 3 facets of varying difficulty:,[object Object],[object Object]
Personal: ‘personal’ vs. ‘official’ blogs
Indepth: ‘in-depth’ vs. ‘shallow’ blogsThe use of the Opinionated facet allowed to leverage past track work on opinion-finding,[object Object],9,[object Object],} binary,[object Object]
Topics,[object Object],One appropriate facet added to each topic,[object Object],<query> hugo chavez </query> ,[object Object],<desc> I am looking for blogs that talk about Venezuelan,[object Object],president Hugo Chavez and his politics. </desc>,[object Object],<facet> indepth </facet> ,[object Object],<narr>I want to follow blogs that talk about Hugo Chavez,,[object Object],the president of Venezuela. Blogs that follow his role in,[object Object],Venezuelan politics are relevant, as well as those that,[object Object],discuss non-political stories and activities. I am more,[object Object],interested in blogs about Chavez than blogs about,[object Object],Venezuelan politics generally.</narr>,[object Object],50 new topics were created by TREC assessors:,[object Object],[object Object]
10 Personal
19 Indepth 10,[object Object]
Runs,[object Object],Retrieval unit:,[object Object],[object Object],For each topic, a run consists of three rankings of 100 blogs:,[object Object],[object Object]
One with the 2nd inclination of facet enabled
One with no facet inclination enabled (akin to topic-relevance baseline)Example: For a topic with Personal facet,[object Object],[object Object]
2nd ranking should have 100 ‘official’ blogs

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Trec2009blog overview v9

Hinweis der Redaktion

  1. Idea of task is groups identify features for ranking wrt to a facet inclination
  2. All facets assumed to have binary inclinations for operational simplicity
  3. For each facet: 2 rankings -&gt; 6 rankings39 queries: each query has two ranking inclination -&gt; 78 AP