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In this study, we formalize a multi-focal learning problem, where training data are partitioned into several different focal groups and the prediction model will be learned within each focal group. The multi-focal learning problem is motivated by numerous real-world learning applications. For instance, for the same type of problems encountered in a customer service center, the problem descriptions from different customers can be quite different. The experienced customers usually give moredoi:10.1145/1557019.1557062 dblp:conf/kdd/GeXZSGW09 fatcat:7nriujra6nay7eekknt3efxrvy