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Hinge-loss Markov Random Fields: Convex Inference for Structured Prediction
Proceedings of the 29th Conference on Uncertainty in Artificial Intelligence, PMLR R11:272-281, 2013.
Abstract
Graphical models for structured domains are powerful tools, but the computational com- plexities of combinatorial prediction spaces can force restrictions on models, or re- quire approximate inference in order to be tractable. Instead of working in a combina- torial space, we use hinge-loss Markov ran- dom fields (HL-MRFs), an expressive class of graphical models with log-concave density functions over continuous variables, which can represent confidences in discrete predic- tions. This paper demonstrates that HL- MRFs are general tools for fast and accu- rate structured prediction. We introduce the first inference algorithm that is both scalable and applicable to the full class of HL-MRFs, and show how to train HL-MRFs with several learning algorithms. Our experiments show that HL-MRFs match or surpass the predic- tive performance of state-of-the-art methods, including discrete models, in four application domains.