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Wednesday, 11th July 2007

Tech Reading from MS Research: Random Walks on the Click Graph

Random Walks on the Click Graph
by Nick Craswell, Martin Szummer
To be presented at the SIGIR Annual Conference later this month.

From the abstract:

Search engines can record which documents were clicked for which query, and use these query-document pairs as 'soft' relevance judgments. However, compared to the true judgments, click logs give noisy and sparse relevance information. We apply a Markov random walk model to a large click log, producing a probabilistic ranking of documents for a given query. A key advantage of the model is its ability to retrieve relevant documents that have not yet been clicked for that query and rank those effectively. We conduct experiments on click logs from image search, comparing our ('backward') random walk model to a different ('forward') random walk, varying parameters such as walk length and self-transition probability. The most effective combination is a long backward walk with high self-transition probability.


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