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Deep Hybrid Models: Bridging Discriminative and Generative Approaches
Proceedings of the 33rd Conference on Uncertainty in Artificial Intelligence, PMLR R15:271-280, 2017.
Abstract
Most methods in machine learning are described as either discriminative or generative. The for- mer often attain higher predictive accuracy, while the latter are more strongly regularized and can deal with missing data. Here, we propose a new framework to combine a broad class of discriminative and generative models, interpo- lating between the two extremes with a multi- conditional likelihood objective. Unlike previ- ous approaches, we couple the two components through shared latent variables, and train using recent advances in variational inference. Instanti- ating our framework with modern deep architec- tures gives rise to deep hybrid models, a highly flexible family that generalizes several existing models and is effective in the semi-supervised setting, where it results in improvements over the state of the art on the SVHN dataset.