Thursday, February 23, 2012

Week 7 - Relevance Feedback and Query Expansion - Reading Note

I read:
  1. Christopher D. Manning, Prabhakar Raghavan, Hinrich Schutze, “Introduction to Information Retrieval”. Cambridge University Press. 2008. Chapter 9.
  2. Xu, J. and Croft, W. B. (2000). Improving the effectiveness of information retrieval with local context analysis. ACM Trans. Inf. Syst.18, 1 (Jan. 2000), 79-112. (DOI= http://doi.acm.org/10.1145/333135.333138)
  3. Wang, X., Fang, H., and Zhai, C. (2008). A study of methods for negative relevance feedback. In Proceedings of the 31st Annual international ACM SIGIR Conference on Research and Development in information Retrieval (Singapore, Singapore, July 20 - 24, 2008). SIGIR '08. ACM, New York, NY, 219-226. (DOI= http://doi.acm.org/10.1145/1390334.1390374)
  4. Donna Harman, (1992). Relevance feedback revisited. Proceedings of the 15th annual international ACM SIGIR conference on Research and development in information retrieval. Pages: 1 - 10. Copenhagen, Denmark. 1992. (http://doi.acm.org/10.1145/133160.133167)

From 1:
I have never seen a search engine with a relevance feedback system. I wonder if there are any practical examples? ... Oh, ok Excite used it primarily as a way to link people to more results like a certain result.

The weakness of the Rocchio algorithm is that it requires relevant documents to cluster into a single group. Any factor that causes the vector-space model to breakdown or cause relevant documents for form multiple clusters decrease the effectiveness of this relevance feedback algorithm.

Query reformulation, especially for technical queries is a way to make the user's query more likely to return relevant results.

From 3:
It is more difficult to use negative relevance feedback to improve results than positive relevance feedback. However, negative feedback works better in the language model than a vector-space model. Most helpful for very difficult queries with poor results.

From 4:
They found that query expansion should be used with relevance reweighting with most of the gains coming from query expansion.

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