25. A page was relevant if 3of the 5 users’ judged it to be relevant. Training set : 280,000 of the 3 million URLs in the ODP
26. Experiment The average precision for rankings induced by topic-sensitive PageRank scoresis substantially higher than that of the unbiased PageRank.
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28. Discussion Why author chosen ODP? Rocchio K-Nearest Neighbor Decision Tree Naïve Bayes Support Vector Machine We don’t need the name of topic too much.
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30. Discussion What if there are relevant document in topics which have 0 point? If A document does not relate with shopping I can not retrieve any document in shopping. Calculate how similar each topic is and cover 0 point