Topic-Specific Link Analysis Using Independent Components for Information Retrieval

Wray Buntine, Jaakko Löfström, Sami Perttu, and Kimmo Valtonen

There has been mixed success in applying semantic component analysis (LSA, PLSA, discrete PCA, etc.) to information retrieval. Previous experiments have shown that high- delity language models do not imply good quality retrieval. Here we combine link analysis with discrete PCA (a semantic component method) to develop an auxiliary score for information retrieval that is used in post- ltering documents retrieved via regular Tf.Idf methods. For this, we use a topic-speci c version of link analysis based on topics developed automatically via discrete PCA methods. To evaluate the resultant topic and link based scoring, a demonstration has been built using the Wikipedia, the public domain encyclopedia on the web.

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