Formal analysis of the Schulz matrix inversion algorithm: A paradigm towards computer aided verification of general matrix flow solvers

Vassilios A. Tsachouridis; Georgios Giantamidis; Stylianos Basagiannis; Kostas Kouramas

doi:10.3934/naco.2019047

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doi: 10.3934/naco.2019047

Formal analysis of the Schulz matrix inversion algorithm: A paradigm towards computer aided verification of general matrix flow solvers

Vassilios A. Tsachouridis ^, , Georgios Giantamidis ^**, , Stylianos Basagiannis and Kostas Kouramas

United Technologies Research Center Ltd., 2nd Floor Penrose Wharf Business Centre, Penrose Quay, Cork, T23 XN53, Ireland

^* Corresponding author: Vassilios A. Tsachouridis (tsachov@utrc.utc.com)

^**Also with Aalto University, Finland

Received January 2019 Revised July 2019 Published September 2019

Fund Project: This work was supported by the Irish Development Agency (IDA) under the program "Network of Excellence in Aerospace Cyber-Physical Systems", 2015-2019.

This paper pilots Schulz generalised matrix inverse algorithm as a paradigm in demonstrating how computer aided reachability analysis and theoretical numerical analysis can be combined effectively in developing verification methodologies and tools for matrix iterative solvers. It is illustrated how algorithmic convergence to computed solutions with required accuracy is mathematically quantified and used within computer aided reachability analysis tools to formally verify convergence over predefined sets of multiple problem data. In addition, some numerical analysis results are used to form computational reliability monitors to escort the algorithm on-line and monitor the numerical performance, accuracy and stability of the entire computational process. For making the paper self-contained, formal verification preliminaries and background on tools and approaches are reported together with the detailed numerical analysis in basic mathematical language. For demonstration purposes, a custom made reachability analysis program based on affine arithmetic is applied to numerical examples.

Keywords: Matrix iterative algorithms, Schulz algorithm, Reachability analysis, Formal verification.

Mathematics Subject Classification: Primary: 65F20, 65F30; Secondary: 68Q45.

Citation: Vassilios A. Tsachouridis, Georgios Giantamidis, Stylianos Basagiannis, Kostas Kouramas. Formal analysis of the Schulz matrix inversion algorithm: A paradigm towards computer aided verification of general matrix flow solvers. Numerical Algebra, Control & Optimization, doi: 10.3934/naco.2019047

References:

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show all references

References:

[1]	AAFLIB - An Affine Arithmetic C++, 2019. Available from: http://aaflib.sourceforge.net. Google Scholar
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[13]	X. Chen, E. Abraham and S. Sankaranarayanan, Flow* An analyzer for non-linear hybrid systems, Proc. of CAV13, LNCS, Springer, 8044 (2013), 258–263. doi: 10.1007/978-3-642-39799-8_18. Google Scholar
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[28]	M. Gameiro and P. Manolios, Formally verifying an algorithm based on interval arithmetic for checking transversality, Workshop on ACL2 Prover and Applications, 2004. Google Scholar
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[30]	C. Le Guernic, Reachability Analysis of Hybrid Systems with Linear Continuous Dynamics, PhD Thesis in Universit Joseph-Fourier-Grenoble I, France, 2009. Google Scholar
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[44]	D. Monniaux, Toward verifiably correct control implementations, The impact of control technology Part 2: Challenges for control research, Report of IEEE Control Systems Society, 2nd Ed, 2011. Available from: http://ieeecss.org/general/IoCT2-report. Google Scholar
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Figure 1. Hybrid automaton for a $ 1 \times 2 $ matrix $ A $

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Figure 2. Hybrid automaton for a $ 2 \times 2 $ matrix $ A $

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Figure 3. Hybrid automaton for a $ 2 \times 3 $ matrix $ A $

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Figure 4. Affine arithmetic approach for bound convergence expression (34) for a $ 2 \times 2 $ interval matrix

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Figure 5. Affine arithmetic approach for bound convergence expression (34) for a $ 2 \times 3 $ interval matrix

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Figure 6. Variation of condition number of $ A $ as function of $ {A_{11}} $

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Figure 7. $ 43 \times 68 $ matrix lpkb2 University of Florida sparse matrix collection

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Figure 8. $ 43 \times 68 $ matrix example in Breach

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Figure 9. Computational reliability monitor for $ 43 \times 68 $ matrix Example 6

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Formal analysis of the Schulz matrix inversion algorithm: A paradigm towards computer aided verification of general matrix flow solvers

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Formal analysis of the Schulz matrix inversion algorithm: A paradigm towards computer aided verification of general matrix flow solvers

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