SJTU at TREC 2004: Web Track Experiments

Yiming Lu, Jian Hu, Fanyuan Ma ( Department of Computer Science & Engineering , S hanghai Jiaotong University , S hanghai 200030) {luyiniao , hujian , ma-fy}@sjtu.edu.cn Abstract: This is the first year our lab to participate in Trec. We participate in Mixed-Query task for the Web track. All the runs we submitted are based on the modified Okapi weighting scheme. Besides, we used several heuristics as the re-rank method: site-merging, minimal span weight, and etc. Also, the PageRank of a document is combined with the similarity of the document with the query to obtain an overall ranking of documents. Especially for the mixed-query task, we try a simple classification method to estimate whether the query is topic distillation or entry-page finding.