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ApproxFlow

  • ApproxFlow is a toolbox for the evaluation of approximate multiliers on DNNs.

How to

  • Download the code.
  • Dependencies: cmake, g++, openmp
  • mkdir build
  • cd build
  • cmake ..
  • make
  • ./approxflow
  • Run different tests by modifying main.cpp and probably Tests/TestQuantArray0.h.

Note

  • You can run testMNIST / testFashionMNIST / testCIFAR10AlexNet functions with various look-up tables of approximate multipliers.
  • The look-up tables are put in the Utils folder:
Multiplier File Name
Wallace Tree accurate.csv
HEAM LUT_ours.txt
KMap[1] approximate.csv
AC[2] LUT_AC.txt
CR(C.6)[3] LUT_CR(C.6).txt
CR(C.7) LUT_CR(C.7).txt
OU(L.1)[4] LUT_OU(L.1).txt
OU(L.3) LUT_OU(L.3).txt
SDLC[5] LUT_SDLC.txt

Reference

[1] P. Kulkarni, P. Gupta, and M. Ercegovac. Trading Accuracy for Power with an Underdesigned Multiplier Architecture. 2011 24th Internatioal Conference on VLSI Design, 2011.

[2] A. Momeni, J. Han, P. Montuschi, and F. Lombardi. Design and Analysis of Approximate Compressors for Multiplication. IEEE Transactions on Computers, 2015.

[3] C. Liu, J. Han, and F. Lombardi. A low-power, high-performance approximate multiplier with configurable partial error recovery. Design, Automation and Test in Europe Conference and Exhibition (DATE), 2014.

[4] C. Chen et al. Optimally Approximated and Unbiased Floating-Point Multiplier with Runtime Configurability. Proceedings of the 39th International Conference on Computer-Aided Desig. 2020.

[5] I. Qiqieh, R. Shafik, G. Tarawneh, D. Sokolov, and A. Yakovlev, "Energy-efficient approximate multiplier design using bit significance-driven logic compression," in Design, Automation and Test in Europe Conference Exhibition (DATE), 2017.