{"title":"A new efficient tour construction heuristic for the Traveling Salesman Problem","authors":"A. J. Ibada, Boldizsar Tuu-Szabo, L. Kóczy","doi":"10.1145/3461598.3461610","DOIUrl":"https://doi.org/10.1145/3461598.3461610","url":null,"abstract":"The creation of the initial population is an essential part of the population based evolutionary algorithms. An appropriate initial population could lead to much faster convergence speed; in contrast, an inappropriate initial population could even cause getting stuck in a local optimum. In this paper, we will propose a new efficient heuristic method to create initial individuals for the Traveling Salesman Problem (TSP), which we will call Circle Group Heuristic (CGH). The results show that CGH creates better tours compared with other well-known heuristic tour construction methods.","PeriodicalId":408426,"journal":{"name":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126646990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Simon Girardin, Fabian Baumann, Rolf Dornberger, T. Hanne
{"title":"Multiobjective Optimization of the Train Staff Planning Problem Using NSGA-II","authors":"Simon Girardin, Fabian Baumann, Rolf Dornberger, T. Hanne","doi":"10.1145/3461598.3461604","DOIUrl":"https://doi.org/10.1145/3461598.3461604","url":null,"abstract":"The optimization problem of assigning train staff to scheduled train services is called the train staff planning problem. A part of this is the rostering with the aim to create a duty timetable under the consideration of different constraints, preferences etc. The problem is formulated as a biobjective problem considering costs and penalties for violating constraints. In this paper, we analyze the application of the nondominated sorting genetic algorithm II (NSGA-II) for multiobjective optimization in order to propose a solution to the considered train staff planning problem. Numerical experiments are conducted using several example problems. These experiments provide suitable parameters for using NSGA-II and further insights into the adaptation of this algorithm to the problem under consideration.","PeriodicalId":408426,"journal":{"name":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130683812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Biased random-key genetic algorithms using path-relinking as a progressive crossover strategy","authors":"C. Ribeiro, José A. Riveaux, J. Brandão","doi":"10.1145/3461598.3461603","DOIUrl":"https://doi.org/10.1145/3461598.3461603","url":null,"abstract":"In a biased random-key genetic algorithm, a deterministic decoder algorithm takes a solution represented by a vector of real numbers (random-keys) and builds a feasible solution for the problem at hand. Selection is said to be biased not only because one parent is always a high-quality solution, but also because it has a higher probability of passing its characteristics to its offspring. Path-relinking is a search intensification strategy to explore trajectories connecting high-quality solutions. In this work, we show how path-relinking can be applied in the space of the random-keys and successfully explored as a progressive crossover strategy in biased random-key genetic algorithms. The efficiency of the newly proposed improved crossover strategies, combining multiple crossover operators with the progressive crossover strategy by path-relinking, is illustrated by applications on two problems: the single-round divisible load scheduling problem and the multi-round divisible load scheduling problem. The computational results show that the improved crossover strategies, combining multiple crossover operators with the progressive crossover strategy by path-relinking, are able not only to improve the running times of the original BRKGA, but also to find better solutions in the same running times.","PeriodicalId":408426,"journal":{"name":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115425602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Khaled Aboumerhi, R. Etienne-Cummings, Jonah P. Sengupta, J. Rattray
{"title":"Hand-Crafted and Learned Spatiotemporal Filters to Inform and Track Visual Saliency","authors":"Khaled Aboumerhi, R. Etienne-Cummings, Jonah P. Sengupta, J. Rattray","doi":"10.1145/3461598.3461605","DOIUrl":"https://doi.org/10.1145/3461598.3461605","url":null,"abstract":"This paper describes an event-tracking algorithm based on an unsupervised learning method to follow salient features. By learning spatiotemporal filters using computationally inexpensive distance metrics such as determinant comparisons, we show that salient features are captured by the learned activation prototypes, known as spatiotemporal templates. First, we discuss previous hand-crafted filter methods to capture spike-based data. While spatial and temporal filters are easily crafted for obvious features, hand-crafted filters are not robust and exhaustive templates for detecting events that may not be so obvious. It becomes clear that learning filters is a more diverse, rectifying method in identifying important features while remaining independent from human observations. We then show how spatiotemporal filters are learned through a series of prototype clustering. In order to handle information over time, we propose a series of decision trees in the form of a random forest inspired by lifelong learning. Finally, we conclude promising results on feature tracking, as well as the need for a ground-truth spike-based data-set to validate saliency algorithms.","PeriodicalId":408426,"journal":{"name":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","volume":"636 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123346828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","authors":"","doi":"10.1145/3461598","DOIUrl":"https://doi.org/10.1145/3461598","url":null,"abstract":"","PeriodicalId":408426,"journal":{"name":"Proceedings of the 2021 5th International Conference on Intelligent Systems, Metaheuristics & Swarm Intelligence","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127921608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}