WAPCO 2019

5th Workshop on Approximate Computing

Valencia, Spain, January 22nd, 2019


Dimitrios S. Nikolopoulos
George Karakonstantis
Cristiano Malossi
Frank K. Gurkaynak
Nikolaos Bellas
Charles Gillan

Workshop Description And Main Topics

Research in the last few years has focused on approximate computing as a means to overcome the energy scaling barriers of computer systems and the worsened reliability issues of the underlying hardware. The new paradigm attempts to utilize the inherent error resilience of key algorithms in many application domains such as signal processing, multimedia, data analytics, deep learning, hpc simulations and computational engineering, among others for relaxing the conservative high numerical accuracy or strict reliability constraints and allowing the use of less power hungry architectures and adequately reliable/precise computing schemes. For instance, fully accurate arithmetic in specific phases of a computation in those applications may have only a marginal effect on output quality, especially if combined with error correction frameworks such as iterative refinement. Thus, accurate execution may be traded off with lower energy consumption by providing the ability to scale supply voltage below nominal values or to use lower precision arithmetic (i.e. 8 or 16 bit).

Rather than focusing on a single layer, designing such systems in a general-purpose computing environment requires a holistic view of all layers from algorithms, programming models, system software, and hardware down to the transistor level. This workshop is an inter-disciplinary effort to bring together researchers from the areas of mathematics, computer science, computer and electrical engineering to discuss challenges, risks and opportunities of approximate and transprecision computing in all design layers. Papers will be published online in the WAPCO website, but not in proceedings. Submitting to WAPCO will not preclude future publication opportunities. Topics include but are not limited to the following:

  • Formal and mathematical methods for approximate computing
  • Programming languages and models for approximate computing
  • Compiler and system software support for approximate computing
  • Hardware, processor and memory techniques for supporting approximate computing
  • Hardware-software interaction for approximate computing
  • Applications that can benefit from approximate computing
  • Simulation and modeling techniques for approximate computing
  • Experimental results, models and error resilient methods for operation beyond pessimistic operating points
  • Position papers on the potential and limitations of approximate computing

Format of the Workshop

We are planning for a full-day workshop, which will include peer-reviewed papers, invited talks and a panel. We are planning for 8 to 10 talks, which we expect to be attended by 50+ people. There will be an open call for papers, and a peer-to-peer review process.

Important Dates

  • Dec 7, 2018: Paper submission deadline

  • Dec 21, 2018: Acceptance notification

  • Jan 22, 2019: Worshop in Valencia, Spain

Submission guidelines

Papers should be submitted electronically through the workshop website following the templates of IEEE Computer Society as in previous years.

Research papers should aim for 6 pages including references. Position papers and short notes should aim for 2 pages. Papers should be submitted in pdf format.
You will find the paper submission site at this link.
All submitted papers must use one of these formatting templates of IEEE Computer Society:

Contact Information

Contact the General Chair for questions.

Past Workshops

General Chair

Cristiano Malossi
Cristiano Malossi
IBM Research GmbH
Zürich, Switzerland
George Karakonstantis
George Karakonstantis

Program Chairs

Dimitrios S. Nikolopoulos
Dimitrios S. Nikolopoulos
Frank K. Gurkaynak
Frank K. Gurkaynak
ETH Zürich
Cristiano Malossi
Cristiano Malossi
IBM Research GmbH
Zürich, Switzerland
Nikolaos Bellas
Nikolaos Bellas

Web and Submission Chair

Program Committee Members

Hans Vandierendonck Queen’s University Belfast, UK
Norbert Wehn University of Kaiserslautern, Germany
Uwe Naumann RWTH-Aachen, Germany
Christos D. Antonopoulos University of Thessaly, Greece
Spyros Lalis University of Thessaly, Greece
Holger Froening University of Heidelberg, Germany
Luca Gammaitoni University of Perugia
Enrique Quintana Orti Universitat Jaume I de Castellon, Spain
Pedro Trancoso University of Cyprus
Stefano Di Carlo Politecnico di Torino
Ramon Canal UPC, Barcelona
Sek Chai SRI, International, USA
Lukas Sekanina Brno University of Technology, Czech Rep.
Alberto Bosio LIRMM/CNRS, France
Dionysios Diamantopoulos IBM Research, Zurich Switzerland


HIPEAC 22 January 2019, Valencia, Spain



OPRECOMP is a 4-year research project funded under the EU Framework Horizon 2020 Program – Future and Emerging Technologies (FET) Proactive Initiative, exploiting cross layer methods for enabling transprecision computing in high-end and embedded systems.


UniServer is a 3-year research project funded by the EU Framework Horizon 2020 Program – under the grant agreement no. 688540, exploiting operation beyond conservative margins in servers.