aPC Matlab Toolbox: Data-driven Arbitrary Polynomial Chaos

Data-driven Arbitrary Polynomial Chaos Expansion for Machine Learning, Uncertainty quantification andGlobal sensitivity analysis

Polynomial chaos expansion (PCE) introduced by Norbert Wiener in 1938. PCE can be seen, intuitively, as a mathematically optimal way to construct and obtain a model response surface in the form of a high-dimensional polynomial in uncertain model parameters. Recently the polynomial chaos expansion received a generalization towards the arbitrary polynomial chaos expansion (aPC: Oladyshkin S. and Nowak W., 2012), which is a so-called data-driven generalization of the PCE. Like all polynomial chaos expansion techniques, aPC approximates the dependence of simulation model output on model parameters by expansion in an orthogonal polynomial basis. The aPC generalizes chaos expansion techniques towards arbitrary distributions with arbitrary probability measures, which can be either discrete, continuous, or discretized continuous and can be specified either analytically (as probability density/cumulative distribution functions), numerically as histogram or as raw data sets. The aPC at finite expansion order only demands the existence of a finite number of moments and does not require the complete knowledge or even existence of a probability density function. This avoids the necessity to assign parametric probability distributions that are not sufficiently supported by limited available data. Alternatively, it allows modellers to choose freely of technical constraints the shapes of their statistical assumptions. Investigations indicate that the aPC shows an exponential convergence rate and converges faster than classical polynomial chaos expansion techniques. The aPC Matlab Toolbox have been developed in the year 2010 for scientific purpose and now it is available for the Matlab community (see details in Readme file).

AUTHOR:

Sergey Oladyshkin

AFFILIATION:

Stuttgart Research Centre for Simulation Technology,

Department of Stochastic Simulation and Safety Research for Hydrosystems,

Institute for Modelling Hydraulic and Environmental Systems,

University of Stuttgart, Pfaffenwaldring 5a, 70569 Stuttgart

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Website: http://www.iws.uni-stuttgart.de