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Disparity between theory & practice beyond the worst-case competitive analysis

Online algorithms are used in a variety of situations such as forex trading, cache replacement, and job scheduling etc. In an online problem, the algorithms is presented with a sequence on input in a serial fashion such that the algorithm does not have knowledge about the future inputs. For instance...

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Main Authors: Iqbal, Javeria, Ahmad, Iftikhar, Shah, Asadullah
Format: Conference or Workshop Item
Language:English
English
English
Published: Institute of Electrical and Electronics Engineers Inc. 2019
Subjects:
T10.5 Communication of technical information
Online Access:http://irep.iium.edu.my/68536/1/68536_Disparity%20between%20theory%20%26%20practice.pdf
http://irep.iium.edu.my/68536/2/68536_Disparity%20between%20theory%20%26%20practice_SCOPUS.pdf
http://irep.iium.edu.my/68536/3/68536_Disparity%20between%20theory%20%26%20practice_WOS.pdf
http://irep.iium.edu.my/68536/
https://ieeexplore.ieee.org/document/8629111
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spelling my.iium.irep.685362019-06-13T03:22:15Z http://irep.iium.edu.my/68536/ Disparity between theory & practice beyond the worst-case competitive analysis Iqbal, Javeria Ahmad, Iftikhar Shah, Asadullah T10.5 Communication of technical information Online algorithms are used in a variety of situations such as forex trading, cache replacement, and job scheduling etc. In an online problem, the algorithms is presented with a sequence on input in a serial fashion such that the algorithm does not have knowledge about the future inputs. For instance, in case of forex, the online algorithm is presented daily exchange rates. The algorithm does not have knowledge about future exchange rates, and has to make an irreversible conversion decision on each day. Competitive analysis is the standard tool to analyse the performance of online algorithms. Competitive analysis measures the performance of an online algorithm against a benchmark optimum offline algorithm. Competitive analysis is a worst case measure and is criticized as a pessimistic approach for performance evaluation. The assumption of online algorithms designed under the competitive analysis paradigm also suffer from the same set of problems as competitive analysis itself. In this work, we contribute towards bridging the gap between theory and practice by considering a set of algorithms for online conversion problems and discuss the disparity between the assumed worst case competitive rations and experimentally achieved competitive ratios using real world data. We present modified worst-case input sequences in order to make them comparable to real world data. In addition, we also investigate, how the assumptions made by the algorithm differs from real world. Further, we highlight other performance measures for online algorithms with the goal of realistic performance evaluation process. Institute of Electrical and Electronics Engineers Inc. 2019-01-28 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/68536/1/68536_Disparity%20between%20theory%20%26%20practice.pdf application/pdf en http://irep.iium.edu.my/68536/2/68536_Disparity%20between%20theory%20%26%20practice_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/68536/3/68536_Disparity%20between%20theory%20%26%20practice_WOS.pdf Iqbal, Javeria and Ahmad, Iftikhar and Shah, Asadullah (2019) Disparity between theory & practice beyond the worst-case competitive analysis. In: 5th IEEE International Conference on Engineering Technologies and Applied Sciences (ICETAS) 2018, 22nd-23rd Nov. 2018, Bangkok, Thailand. https://ieeexplore.ieee.org/document/8629111 10.1109/ICETAS.2018.8629111
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
English
topic T10.5 Communication of technical information
spellingShingle T10.5 Communication of technical information
Iqbal, Javeria
Ahmad, Iftikhar
Shah, Asadullah
Disparity between theory & practice beyond the worst-case competitive analysis
description Online algorithms are used in a variety of situations such as forex trading, cache replacement, and job scheduling etc. In an online problem, the algorithms is presented with a sequence on input in a serial fashion such that the algorithm does not have knowledge about the future inputs. For instance, in case of forex, the online algorithm is presented daily exchange rates. The algorithm does not have knowledge about future exchange rates, and has to make an irreversible conversion decision on each day. Competitive analysis is the standard tool to analyse the performance of online algorithms. Competitive analysis measures the performance of an online algorithm against a benchmark optimum offline algorithm. Competitive analysis is a worst case measure and is criticized as a pessimistic approach for performance evaluation. The assumption of online algorithms designed under the competitive analysis paradigm also suffer from the same set of problems as competitive analysis itself. In this work, we contribute towards bridging the gap between theory and practice by considering a set of algorithms for online conversion problems and discuss the disparity between the assumed worst case competitive rations and experimentally achieved competitive ratios using real world data. We present modified worst-case input sequences in order to make them comparable to real world data. In addition, we also investigate, how the assumptions made by the algorithm differs from real world. Further, we highlight other performance measures for online algorithms with the goal of realistic performance evaluation process.
format Conference or Workshop Item
author Iqbal, Javeria
Ahmad, Iftikhar
Shah, Asadullah
author_facet Iqbal, Javeria
Ahmad, Iftikhar
Shah, Asadullah
author_sort Iqbal, Javeria
title Disparity between theory & practice beyond the worst-case competitive analysis
title_short Disparity between theory & practice beyond the worst-case competitive analysis
title_full Disparity between theory & practice beyond the worst-case competitive analysis
title_fullStr Disparity between theory & practice beyond the worst-case competitive analysis
title_full_unstemmed Disparity between theory & practice beyond the worst-case competitive analysis
title_sort disparity between theory & practice beyond the worst-case competitive analysis
publisher Institute of Electrical and Electronics Engineers Inc.
publishDate 2019
url http://irep.iium.edu.my/68536/1/68536_Disparity%20between%20theory%20%26%20practice.pdf
http://irep.iium.edu.my/68536/2/68536_Disparity%20between%20theory%20%26%20practice_SCOPUS.pdf
http://irep.iium.edu.my/68536/3/68536_Disparity%20between%20theory%20%26%20practice_WOS.pdf
http://irep.iium.edu.my/68536/
https://ieeexplore.ieee.org/document/8629111
_version_ 1643619802966654976
score 13.211869

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