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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| Format: | Proceeding Paper |
| Language: | en en en |
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Institute of Electrical and Electronics Engineers Inc.
2019
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| 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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| _version_ | 1834514124368773120 |
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| author | Iqbal, Javeria Ahmad, Iftikhar Shah, Asadullah |
| author_facet | Iqbal, Javeria Ahmad, Iftikhar Shah, Asadullah |
| author_sort | Iqbal, Javeria |
| building | IIUM Library |
| collection | Institutional Repository |
| content_provider | International Islamic University Malaysia |
| content_source | IIUM Repository (IREP) |
| continent | Asia |
| country | Malaysia |
| 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 | Proceeding Paper |
| id | my.iium.irep-68536 |
| institution | Universiti Islam Antarabangsa Malaysia |
| language | en en en |
| publishDate | 2019 |
| publisher | Institute of Electrical and Electronics Engineers Inc. |
| record_format | dspace |
| 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 Proceeding Paper 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 |
| spellingShingle | T10.5 Communication of technical information Iqbal, Javeria Ahmad, Iftikhar Shah, Asadullah Disparity between theory & practice beyond the worst-case competitive analysis |
| title | 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_short | Disparity between theory & practice beyond the worst-case competitive analysis |
| title_sort | disparity between theory & practice beyond the worst-case competitive analysis |
| topic | T10.5 Communication of technical information |
| 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 |
| url_provider | http://irep.iium.edu.my/ |