Computing complex functions using factorization in unipolar stochastic logic

Yin Liu; Keshab K. Parhi

doi:10.1145/2902961.2902999

Computing complex functions using factorization in unipolar stochastic logic

Yin Liu
, Keshab K. Parhi

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

7 Scopus citations

Abstract

This paper addresses computing complex functions using unipolar stochastic logic. Stochastic computing requires simple logic gates and is inherently fault-tolerant. Thus, these structures are well suited for nanoscale CMOS technologies. Implementations of complex functions cost extremely low hardware complexity compared to traditional two's complement implementation. In this paper an approach based on polynomial factorization is proposed to compute functions in unipolar stochastic logic. In this approach, functions are expressed using polynomials, which are derived from Taylor expansion or Lagrange interpolation. Polynomials are implemented in stochastic logic by using factorization. Experimental results in terms of accuracy and hardware complexity are presented to compare the proposed designs of complex functions with previous implementations using Bernstein polynomials.

Original language	English (US)
Title of host publication	GLSVLSI 2016 - Proceedings of the 2016 ACM Great Lakes Symposium on VLSI
Publisher	Association for Computing Machinery
Pages	109-112
Number of pages	4
ISBN (Electronic)	9781450342742
DOIs	https://doi.org/10.1145/2902961.2902999
State	Published - May 18 2016
Event	26th ACM Great Lakes Symposium on VLSI, GLSVLSI 2016 - Boston, United States Duration: May 18 2016 → May 20 2016

Publication series

Name	Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI
Volume	18-20-May-2016

Other

Other	26th ACM Great Lakes Symposium on VLSI, GLSVLSI 2016
Country/Territory	United States
City	Boston
Period	5/18/16 → 5/20/16

Bibliographical note

Publisher Copyright:
© 2016 ACM.

Keywords

Complex functions
Polynomial factorization
Stochastic division
Stochastic logic
Stochastic subtraction
Unipolar representation

Publisher link

10.1145/2902961.2902999

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Computing complex functions using factorization in unipolar stochastic logic. / Liu, Yin; Parhi, Keshab K.
GLSVLSI 2016 - Proceedings of the 2016 ACM Great Lakes Symposium on VLSI. Association for Computing Machinery, 2016. p. 109-112 (Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI; Vol. 18-20-May-2016).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Liu, Y & Parhi, KK 2016, Computing complex functions using factorization in unipolar stochastic logic. in GLSVLSI 2016 - Proceedings of the 2016 ACM Great Lakes Symposium on VLSI. Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI, vol. 18-20-May-2016, Association for Computing Machinery, pp. 109-112, 26th ACM Great Lakes Symposium on VLSI, GLSVLSI 2016, Boston, United States, 5/18/16. https://doi.org/10.1145/2902961.2902999

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title = "Computing complex functions using factorization in unipolar stochastic logic",

abstract = "This paper addresses computing complex functions using unipolar stochastic logic. Stochastic computing requires simple logic gates and is inherently fault-tolerant. Thus, these structures are well suited for nanoscale CMOS technologies. Implementations of complex functions cost extremely low hardware complexity compared to traditional two's complement implementation. In this paper an approach based on polynomial factorization is proposed to compute functions in unipolar stochastic logic. In this approach, functions are expressed using polynomials, which are derived from Taylor expansion or Lagrange interpolation. Polynomials are implemented in stochastic logic by using factorization. Experimental results in terms of accuracy and hardware complexity are presented to compare the proposed designs of complex functions with previous implementations using Bernstein polynomials.",

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Computing complex functions using factorization in unipolar stochastic logic

Abstract

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Keywords

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