TY  - JOUR
AU  - Di Napoli, Edoardo
AU  - Fabregat-Traver, Diego
AU  - Quintana-Ortí, Gregorio
AU  - Bientinesi, Paolo
TI  - Towards an efficient use of the BLAS library for multilinear tensor contractions
JO  - Applied mathematics and computation
VL  - 235
SN  - 0096-3003
CY  - New York, NY
PB  - Elsevier
M1  - FZJ-2014-02953
SP  - 454 - 468
PY  - 2014
AB  - Mathematical operators whose transformation rules constitute the building blocks of a multi-linear algebra are widely used in physics and engineering applications where they are very often represented as tensors. In the last century, thanks to the advances in tensor calculus, it was possible to uncover new research fields and make remarkable progress in the existing ones, from electromagnetism to the dynamics of fluids and from the mechanics of rigid bodies to quantum mechanics of many atoms. By now, the formal mathematical and geometrical properties of tensors are well defined and understood; conversely, in the context of scientific and high-performance computing, many tensor-related problems are still open. In this paper, we address the problem of efficiently computing contractions among two tensors of arbitrary dimension by using kernels from the highly optimized BLAS library. In particular, we establish precise conditions to determine if and when GEMM, the kernel for matrix products, can be used. Such conditions take into consideration both the nature of the operation and the storage scheme of the tensors, and induce a classification of the contractions into three groups. For each group, we provide a recipe to guide the users towards the most effective use of BLAS.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000335898500047
DO  - DOI:10.1016/j.amc.2014.02.051
UR  - https://juser.fz-juelich.de/record/153312
ER  -