385	RWTH Publication No: 229997        2014        IGPM385.pdf
TITLE	Hierarchical Tensor Approximation of Output Quantities of Parameter-Dependent PDEs
AUTHORS	Jonas Ballani, Lars Grasedyck
ABSTRACT	Parametric PDEs appear in a large number of applications, as, e.g., in uncertainty quantification or optimisation. In many cases, one is interested in scalar output quantities induced by the parameter-dependent solution. The output can be interpreted as a tensor living on a high-dimensional parameter space. Our aim is to adaptively construct an approximation of this tensor in a data-sparse hierarchical tensor format. Once this approximation from an offline computation is available, the evaluation of the output for any parameter value becomes a cheap online task. Moreover, the explicit tensor representation can be used to compute stochastic properties of the output in a straightforward way. The potential of this approach is illustrated by numerical examples.
KEYWORDS	hierarchical Tucker, low rank tensor, SPDE, cross approximation, sampling
DOI	10.1137/140960980
PUBLICATION	SIAM/ASA J. Uncertainty Quantification 3(1), pp 852–872