Christoph Lauter

Christoph LauterPh.D

Assistant Professor
Computer Science
ECB 308G
(907) 786 - 0619
clauter@alaska.edu
http://www.christoph-lauter.org/

Education

Ph.D. in Computer Science from École Normale Supérieure de Lyon, France

Biography

Born in Germany, Master at Technische Universität München, Ph.D. at École Normale Supérieure de Lyon, worked for Intel Corp. in 2008-2010, Associate Professor at Sorbonne Université, Paris, 2010-2018. Married to a Russian. Speaks 4 languages every day (English, German, French, Russian).

Teaching Responsibilities

Computer Programming I, Operating Systems, Automata

Research Interests

Floating-point arithmetic, Computer Arithmetic, IEEE754, Computer Algebra, Numerical Computations

Publications

Articles in international journals:
  • Arithmetic approaches for rigorous design of Fixed-Point LTI filters, with Thibault Hilaire, and Anastasiia Volkova, in IEEE Transactions on Computers, 2019.
  • MPDI: A Decimal Multiple-Precision Interval Arithmetic Library, with Stef Graillat and Clothilde Jeangoudoux, in Reliable Computing Journal, vol. 25, 2017.
  • Comparison between binary and decimal floating-point numbers, with Nicolas Brisebarre, Marc Mezzarobba and Jean-Michel Muller, in IEEE Transactions on Computers, vol. 65, number 7, July 2016.
  • Efficient calculations of faithfully rounded l2-norms of n-vectors, with Stef Graillat, Ping Tak Peter Tang, Naoya Yamanaka and Shin'ichi Oishi, in ACM Transactions on Mathematical Software, vol. 41, number 4, October 2015.
  • On Ziv's rounding test, with Florent de Dinechin, Jean-Michel Muller and Serge Torres, in ACM Transactions on Mathematical Software, vol. 39, number 4, 2013; Preprint in research report ensl-00693317, LIP, CNRS/ENS Lyon/INRIA/Université de Lyon, LIP6, PEQUAN, UPMC Paris 6, May 2012.
  • Efficient and accurate computation of upper bounds of approximation errors, with Sylvain Chevillard, John Harrison and Mioara Joldeş, in Theoretical Computer Science, vol. 412, issue 16, pages 1523-1543, 2011, Final version; Preprint in research report 2010-2, LIP, École Normale Supérieure de Lyon, July 2010.
  • Certifying the floating-point implementation of an elementary function using Gappa, with Florent de Dinechin and Guillaume Melquiond, in IEEE Transactions on Computers, vol. 60, number 2, pages 242-253, 2011, Final version; Preprint in research report INRIA inria-00533968, November 2010.
  • Computing Correctly Rounded Integer Powers in Floating-Point Arithmetic, with Jean-Michel Muller, Peter Kornerup, Vincent Lefèvre and Nicolas Louvet, in ACM Transactions on Mathematical Software, Vol. 37, No. 1, Article 4, January 2010, Preprint in research report 2008-15, LIP, École Normale Supérieure de Lyon, May 2008.
  • An efficient rounding boundary test for pow(x,y) in double precision, with Vincent Lefèvre, in IEEE Transactions on Computers, 2009, vol. 58, 2, pages 197-207, February 2009. Preprint in research report 2007-36, LIP, École Normale Supérieure de Lyon, August 2007.
  • Fast and correctly rounded logarithms in double-precision, with Florent de Dinechin and Jean-Michel Muller, in RAIRO, Theoretical Informatics and Applications, 2007, vol. 41, pages 85-102, Preprint in research report 2005-37, LIP, École Normale Supérieure de Lyon, September 2005.

Articles in the proceedings of international conferences:

  • Precision Adaptation for Fast and Accurate Polynomial Evaluation Generation, with Nicolas Brunie and Guillaume Revy, in Proceedings of the 2019 IEEE 30th International Conference on Application-specific Systems, New York, NY, USA.
  • Rigorous Polynomial Approximation, in Proceedings of the 2018 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2018.
  • A correctly rounded mixed-radix fused-multiply-add, with Clothilde Jeangoudoux, in Proceedings of the 2018 IEEE 25th SYMPOSIUM on Computer Arithmetic, Amherst, MA, USA, July 2018.
  • Why Taylor models and modified Taylor models are empirically successful: a symmetry-based explanation, with Mioara Joldeş, Martine Ceberio, Olga Kosheleva and Vladik Kreinovich, in Proceedings of the 8th International Workshop on Reliable Engineering Computing REC'2018, July 2018.
  • A parallel compensated Horner scheme, with Stef Graillat, Youness Ibrahimy and Clothilde Jeangoudoux, in Proceedings of CSE 2017, SIAM Conference on Computational Science and Engineering (CSE), 2017.
  • An efficient software implementation of correctly rounded operations extending FMA: a + b + c and a * b + c * d, in Proceedings of the 2017 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2017.
  • Rigorous determination of recursive filter fixed-point implementation with input signal frequency specifications, with Anastasiia Volkova, Thibault Hilaire and Marc Mezzarobba, in Proceedings of the 2017 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2017.
  • Reliable verification of digital implemented filters against frequency specifications, with Anastasiia Volkova and Thibault Hilaire, in Proceedings of the 2017 IEEE 24th SYMPOSIUM on Computer Arithmetic, London, UK, July 2017.
  • A new Open-Source SIMD Vector Libm Fully Implemented With High Level Scalar C, in Proceedings of the 2016 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2016.
  • MPDI: A Decimal Multiple-Precision Interval Arithmetic Library, with Stef Graillat and Clothilde Jeangoudoux, in Proceedings of SCAN 2016, Uppsala, Sweden, 2016.
  • Easing Development of Precision-Sensitive Applications with a Beyond-Quad-Precision Library, in Proceedings of the 2015 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2015.
  • Determining Fixed-Point Formats for a Digital Filter Implementation using the Worst-Case Peak Gain Measure, with Anastasiia Volkova and Thibault Hilaire, in Proceedings of the 2015 Asilomar Conference on Signals, Systems and Computers, Pacific Grove, CA, USA, 2015.
  • Code generators for mathematical functions, with Nicolas Brunie, Florent de Dinechin and Olga Kupriianova, in Proceedings of the 22nd IEEE Symposium on Computer Arithmetic, pages 66-73, Lyon, France, 2015, Best Paper Award.
  • Reliable evaluation of the worst-case peak gain matrix in multiple precision, with Thibault Hilaire and Anastasiia Volkova, in Proceedings of the 22nd IEEE Symposium on Computer Arithmetic, Lyon, France, 2015.
  • Semi-Automatic Floating-Point Implementation of Special Functions, with Marc Mezzarobba, in Proceedings of the 22nd IEEE Symposium on Computer Arithmetic, Lyon, France, 2015.
  • A Domain Splitting Algorithm for the Mathematical Functions Code Generator, with Olga Kupriianova, in Proceedings of the 2014 Asilomar Conference on Signals, Systems and Computers, pages 1271-1275, Pacific Grove, CA, USA, 2014.
  • Metalibm: Mathematical Functions Code Generator, with Olga Kupriianova, in Proceedings of the 4th International Congress on Mathematical Software ICMS, pages 713-717, Seoul, South Korea, 2014.
  • Radix Conversion for IEEE754-2008 Mixed Radix Floating-Point Arithmetic, with Olga Kupriianova and Jean-Michel Muller, in Proceedings of the 2013 Asilomar Conference on Signals, Systems and Computers, pages 1139-1143, Pacific Grove, CA, USA, 2013.
  • Comparison between binary64 and decimal64 floating-point numbers, with Nicolas Brisebarre, Marc Mezzarobba and Jean-Michel Muller, in Proceedings of the 21st IEEE Symposium on Computer Arithmetic, pages 145-152, Austin, Texas, USA, April 2013, Preprint in research report ARIC, LIP, PEQUAN, LIP6, Number ensl-00737881, Slides.
  • Sollya: an environment for the development of numerical codes, with Sylvain Chevillard and Mioara Joldeş, in Proceedings of the Third international congress conference on Mathematical Software, ICMS'10, pages 28-31, Kobe, Japan, September 2010, LNCS, Springer, Final version.
  • Certified and fast computation of supremum norms of approximation errors, with Sylvain Chevillard and Mioara Joldeş, in Proceedings of the 19th IEEE Symposium on Computer Arithmetic, pages 169-176, Portland, Oregon, USA, July 2009, Preprint in research report 2008-37, LIP, École Normale Supérieure de Lyon, October 2008.
  • Optimizing polynomials for floating-point implementation, with Florent de Dinechin, in Proceedings of the 8th Conference on Real Numbers and Computers, pages 7-16, Santiago de Compostela, Spain, July 2008, Preprint in research report 2008-11, LIP, École Normale Supérieure de Lyon, March 2008.
  • A certified infinite norm for the implementation of elementary functions, with Sylvain Chevillard, in Proceedings of the Seventh International Conference on Quality Software, pages 153-160, Portland, Oregon, USA, October 2007, Preprint and Extended Version in research report 2007-26, LIP, École Normale Supérieure de Lyon, June 2007.
  • Assisted verification of elementary functions using Gappa, with Florent de Dinechin and Guillaume Melquiond, in Proceedings of the 21st Annual ACM Symposium on Applied Computing - MCMS Track, vol. 2, pages 1318-1322, Dijon, France, April 2006, Preprint and Extended Version in research report #5683, INRIA, September 2005.

Research reports:

  • On Ziv's rounding test, with Florent de Dinechin, Jean-Michel Muller and Serge Torres, Research report ensl-00693317, LIP, CNRS/ENS Lyon/INRIA/Université de Lyon, LIP6, PEQUAN, UPMC Paris 6, May 2012.
  • Efficient and accurate computation of upper bounds of approximation errors, with Sylvain Chevillard, John Harrison and Mioara Joldeş, Research report 2010-2, LIP, CNRS/ENS Lyon/INRIA/Université de Lyon, INRIA, LORIA, CACAO project and Intel Corporation, Hillsboro, Oregon, USA, January 2010. Article submitted to Theoretical Computer Science; Special Issue on Symbolic and Numeric Computation, 2009.
  • Certifying floating-point implementations using Gappa, with Florent de Dinechin and Guillaume Melquiond, Research report arXiv: 0801.0523, LIP, CNRS/ENS Lyon/INRIA/Université de Lyon, January 2008.
  • Exact and mid-point rounding cases of power(x,y), Research report 2006-46, LIP, École Normale Supérieure de Lyon, December 2006.
  • Basic building blocks for a triple-double intermediate format, Research report RR-5702, INRIA, September 2005.
  • Fast correct rounding of elementary functions in double precision using double-extended arithmetic, with Florent de Dinechin and David Defour, Research report 2004-10, LIP, École Normale Supérieure de Lyon, March 2004.
  • A correctly rounded implementation of the exponential function on the Intel Itanium architecture, Research report RR-5024, INRIA, December 2003.

Master's, Ph.D. thesis, Habilitation (HDR) thesis:

  • Beyond IEEE754 Floating-Point Arithmetic, Habilitation à Diriger des Recherches (HDR), Sorbonne Université, May 2019.
  • Arrondi correct de fonctions mathématiques - Fonctions univariées et bivariées, certification et automatisation, Thèse de doctorat, École Normale Supérieure de Lyon, October 2008.
  • Effective evaluation of correctly rounded elementary functions using triple-double intermediate representation, Master's thesis, Technische Universität München, Faculty of Computer Science, September 2005.
  • Ressourcenmanagement über drahtgebundene und drahtlose LAN, Thesis for a development project, Technische Universität München, Chair for Communication Networks, 2004.

Presentations and Workshops:

  • Conception d'un algorithme numérique correct, with Guillaume Melquiond, CNRS Thematic School: Précision et Reproductibilité en Calcul Numérique, Fréjus, France, March 2013, Slides.
  • The libieee754 compliance library for the IEEE 754-2008 standard, with Olga Kupriianova, 15th GAMM - IMACS International Symposion on Scientific Computing, Computer Arithmetic and Validated Numerics, Novosibirsk, Russia, September 2012.
  • There's no Reliable Computing without Reliable Access to Rounding Modes, with Valérie Ménissier-Morain, 15th GAMM - IMACS International Symposion on Scientific Computing, Computer Arithmetic and Validated Numerics, Novosibirsk, Russia, September 2012.
  • De l'implantation de fonctions correctement arrondies aux bibliothèques LIBM IEEE 754-2008 clef en main, Presentation for the workshop of the PEQUAN team, Paris, France, February 2011, Slides.
  • L'implantation d'une fonction correctement arrondie, ou : CRLibm for dummies, Presentation for the ANR TaMaDi project, Lyon, France, October 2010, Slides.
  • Sollya - a numerical software tool for the semi-automatic implementation of efficient correctly rounded mathematical functions, presentation on invitation for the conference ACA 2008, Hagenberg, Austria, July 2008, Abstract.
  • Quand les boucles deviennent des polynômes ou l'implantation automatique de fonctions, Presentation at the RAIM 2008 days, Lille, France, June 2008, Slides.
  • Vers une implémentation automatique de fonctions libm, Presentation for the EVA-Flo project, Perpignan, France, October 2007, Slides.
  • Advancements in (cr)libm development, Presentation for Intel Portland, Portland, Orgeon, USA, October 2007, Slides.
  • Towards automatic generation of elementary functions, Presentation for the russian team in the Intel Numerics Group, Nizhny Novgorod, Russia, August 2007, Slides.
  • Automatisation du contrôle de précision et de la preuve pour les formats double-double et triple-double, Workshop of the CACAO project, LORIA, Nancy, France, January 2007.
  • A Survey of Multiple-Precision Using Floating-Point Arithmetic, Fourth International Workshop on Taylor Methods, Boca Raton, Florida, USA, December 2006, Abstract, Slides.
  • Certified infinite norm using interval arithmetic, with Sylvain Chevillard, 12th GAMM - IMACS International Symposion on Scientific Computing, Computer Arithmetic and Validated Numerics, Duisburg, Germany, September 2006, Abstract.
  • Normes infinies certifiées par l'arithmétique d'intervalles, Journées Nationales d'Arithmétique des Ordinateurs 2006, May-June 2006, Slides.
  • Correctly rounding elementary functions using triple-double intermediate representation, Journées Arinews, Perpignan, France, November 2005, Slides.

Miscellaneous:

  • Users' manual for the Sollya tool, Release 4.0, with Sylvain Chevillard and Mioara Joldeş, Users' manual.
  • Users' manual for the Sollya tool, Release 3.0, with Sylvain Chevillard and Mioara Joldeş, Users' manual.

Career History/Work Experience

Master at Technische Universität München, Ph.D. at École Normale Supérieure de Lyon, worked for Intel Corp. in 2008-2010, Associate Professor at Sorbonne Université, Paris, 2010-2018

Duties & Responsibilities

Member of Editorial Board of Reliable Computing, Ballotting Member of IEEE754 revision group