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SCOAL: A Framework for Simultaneous Co-Clustering and Learning from Complex Data MEGHANA DEODHAR and JOYDEEP GHOSH University of Texas at Austin For dif cult classi cation or regression problems, practitioners often segment the data into relatively homogeneous groups and then build a predictive model for each group. This two-step procedure usually results in simpler, more interpretable and actionable models without any loss in accuracy. In this work, we consider problems such as predicting customer behavior across products, where the independent variables can be naturally partitioned into two sets, that is, the data is dyadic in nature. A pivoting operation now results in the dependent variable showing up as entries in a customer by product data matrix. We present the Simultaneous CO-clustering And Learning (SCOAL) framework, based on the key idea of interleaving co-clustering and construction of prediction models to iteratively improve both cluster assignment and t of the models. This algorithm provably converges to a local minimum of a suitable cost function. The framework not only generalizes co-clustering and collaborative ltering to model-based co-clustering, but can also be viewed as simultaneous co-segmentation and classi cation or regression, which is typically better than independently clustering the data rst
ACM Transactions on Knowledge Discovery from Data (TKDD) – Association for Computing Machinery
Published: Oct 1, 2010
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