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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Statistics Seminars: Imprecise machine learning models using sets of probabilities and the uncertainty trick

Presented by Prof Lev Utkin, Peter the Great St.Petersburg Polytechnic University

28 November 2016 14:00 in CM221

An approach for incorporating imprecise prior knowledge into the machine learning SVM-based models is considered. The main idea underlying the approach is to use a double duality representation in the framework of the minimax strategy of decision making. This idea allows us to get simple extensions of SVMs including additional constraints for optimization variables (the Lagrange multipliers) formalizing the incorporated imprecise information. The approach is extended to deal with interval-values or set-valued training data by means of the so-called uncertainty trick when training examples with the interval uncertainty are transformed to training data with the probabilistic uncertainty. Every interval is replaced by a set of training points such that every point inside the interval has an unknown probability from a predefined set of probabilities. It is also shown how to incorporate imprecise prior knowledge into neural networks which can be regarded as a promising machine learning tool.

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