In this paper, we present an efficient implementation of general tensor contractions, which is part of a new coupled-cluster program. The tensor contractions, used to evaluate the residuals in each coupled-cluster iteration are particularly important for the performance of the program. We developed a generic procedure, which carries out contractions of two tensors irrespective of their explicit structure. It can handle coupled-cluster-type expressions of arbitrary excitation level. To make the contraction efficient without loosing flexibility, we use a three-step procedure. First, the data contained in the tensors are rearranged into matrices, then a matrix-matrix multiplication is performed, and finally the result is backtransformed to a tensor. The current implementation is significantly more efficient than previous ones capable of treating arbitrary high excitations. © 2010 American Institute of Physics.
CITATION STYLE
Hanrath, M., & Engels-Putzka, A. (2010). An efficient matrix-matrix multiplication based antisymmetric tensor contraction engine for general order coupled cluster. Journal of Chemical Physics, 133(6). https://doi.org/10.1063/1.3467878
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