New insights on parameter estimation

author: Nando de Freitas, Department of Computer Science, University of Oxford
published: Oct. 6, 2014,   recorded: December 2013,   views: 3263

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I will discuss two new developments in parameter estimation. First, I will show that it is possible to train most deep learning approaches - regardless of the choice of regularization, architecture, algorithms and datasets - by learning only a small number of the weights and predicting the rest with nonparametric methods. Often, this approach makes it possible to learn only 10% of the weights without a drop in accuracy. Second, I will introduce a new method (LAP) for parameter estimation in loopy undirected probabilistic graphical models of sparse connectivity. In several domains of practical interest - e.g., grid MRFs and chimera lattices used in quantum annealing computers - previous statistically efficient estimators had an exponential computational complexity in the size of the model. In these domains, the new approach reduces the complexity from exponential to linear.

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