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Sebastian Krämer, M.Sc. RWTH

IGPM, RWTH Aachen


PhD student


supervisor:Lars Grasedyck
office:Hauptgebäude 104.2
phone:+49 241 80-94875
fax:+49 241 80-92317
email:kraemer@igpm.rwth-aachen.de
office hour:by appointment (or just knock on the door)

Publications

S. Krämer, The Geometrical Description of Feasible Singular Values in the Tensor Train Format.
Preprint.
[arXiv]
L. Grasedyck and S. Krämer, Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion.
Preprint.
[IGPM] [arXiv]
L. Grasedyck, M. Kluge, and S. Krämer, Variants of alternating least squares tensor completion in the tensor train format.
SIAM Journal on Scientific Computing 37(5):A2424--A2450, 2015.
[epubs.siam]

Presentations (with updated titles)

L. Grasedyck and S. Krämer, The Geometrical Description of Feasible Singular Values in the Tensor Train Format:

Poster: The Geometrical Description of Feasible Singular Values in the Tensor Train Format.
Workshop A1, FoCM '17 (2nd), Barcelona, Spain, 2017
[LINK]
Talk: The Geometrical Description of Feasible Singular Values in the Tensor Train Format.
GAMM, Weimar, Germany, 2017
[LINK]

L. Grasedyck and S. Krämer, Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion:

Poster: Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion.
Workshop B7, FoCM '17 (2nd), Barcelona, Spain, 2017
[LINK]
Talk: Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion.
UNCECOMP (2nd), Rhodes, Greece, 2017
[LINK]
Talk: Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion.
METT VII, Pisa, Italy, 2017
[LINK]
Talk: Semi-Implicit Rank Adaption for Alternating Tensor Completion in the TT Format.
ILAS, Leuven, Belgium, 2016
[LINK]

L. Grasedyck, M. Kluge, and S. Krämer, Variants of Alternating Least Squares Tensor Completion in The Tensor Train Format:

Talk: A Variant of Alternating Least Squares Tensor Completion in the TT-Format.
Siam Conference on Applied Linear Algebra, Atlanta, USA, 2015
[LINK]
Poster: A Variant of Alternating Least Squares Tensor Completion in the TT-Format. Workshop: Low-rank Optimization and Applications (Hausdorff Center for Mathematics), Bonn, Germany, 2015 [LINK]

Implementations

SALSA from "Stable ALS Approximation in the TT-Format for Rank-Adaptive Tensor Completion". A C++ implementation is in progress. Matlab Implementation
ADF/ALS from "Variants of alternating least squares tensor completion in the tensor train format". This version is not user-friendly. A new and proper implementation is in progress. For the equivalent Matlab Code, please contact me. C Implementation

Teaching

Numerische Mathematik (for electrical engineers) [SS17]
Numerische Mathematik IV (for mathematicians) [WS1617]
Seminar "Aktuelle Themen der Numerik" (for mathematicians)[SS16]
Numerische Multilineare Algebra (for mathematicians)[SS16]
Numerische Mathematik III (for mathematicians) [WS1516]
Numerische Mathematik II (for mathematicians) [SS15]
Numerische Mathematik I (for mathematicians) [WS1415]
Begleitpraktikum I / II (for mathematicians, during studies) [2009-2011, 2012-2014]