在进化多目标优化领域,决策者(DM)涉及相互冲突的目标。在现实世界中,通常存在多个DM,每个DM都涉及这些目标的一部分。提出了多方多目标优化问题(MPMOPS)来描绘拖把,其中涉及多个决策者,每个方都关注所有目标的某些目标。但是,在进化计算字段中,对mpmops的关注不多。本文基于距离最小化问题(DMP)构建了一系列MPMOP,它们的Pareto最佳解决方案可以生动地可视化。为了解决MPMOPS,新提出的算法OPTMPNDS3使用多方初始化方法来初始化总体,并带Jade2操作员生成后代。在问题套件上,将OPTMPNDS3与Optall,OptMPND和OptMPNDS2进行了比较。结果表明OPTMPNDS3与其他算法具有很强的可比性
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最近,已经进行了NSGA-II的第一个数学运行时分析,这是最常见的多目标进化算法(Zheng,Liu,Doerr(AAAI 2022))。继续这一研究方向,我们证明了NSGA-II在使用交叉时,渐近渐近地测试了OneJumpZeroJump基准测试。这是NSGA-II首次证明这种交叉的优势。我们的论点可以转移到单目标优化。然后,他们证明,跨界可以以不同的方式加速$(\ MU+1)$遗传算法,并且比以前更为明显。我们的实验证实了交叉的附加值,并表明观察到的加速度甚至比我们的证明所能保证的要大。
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客户满意度在移动设备中的能源消耗至关重要。应用程序中最耗能的部分之一是图像。尽管具有不同质量的不同图像消耗了不同量的能量,但没有直接的方法来计算典型图像中操作的能量消耗。首先,本文调查了能源消耗与图像质量以及图像文件大小之间存在相关性。因此,这两者可以被视为能源消耗的代理。然后,我们提出了一种多目标策略,以增强图像质量并根据JPEG图像压缩中的定量表减少图像文件大小。为此,我们使用了两种一般的多目标元启发式方法:基于标量和基于帕累托。标量方法找到基于组合不同目标的单个最佳解决方案,而基于帕累托的技术旨在实现一组解决方案。在本文中,我们将策略纳入五种标量算法,包括能量感知的多目标遗传算法(ENMOGA),能量感知的多目标粒子群优化(ENMOPSO),能量感知的多目标多目标差异进化(ENMODE)(ENMODE)(ENMODE) ,能源感知的多目标进化策略(ENMOES)和能量感知的多目标模式搜索(ENMOPS)。此外,使用两种基于帕累托的方法,包括非主导的分类遗传算法(NSGA-II)和基于参考点的NSGA-II(NSGA-III),用于嵌入方案,以及两种基于帕累托的算法,即两种基于帕累托的算法,即提出了Ennsgaii和Ennsgaiii。实验研究表明,基线算法的性能通过将拟议策略嵌入到元启发式算法中来提高。
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语义已成为遗传编程(GP)研究的关键话题。语义是指在数据集上运行时GP个体的输出(行为)。专注于单目标GP中语义多样性的大多数作品表明它在进化搜索方面是非常有益的。令人惊讶的是,在多目标GP(MOGP)中,在语义中进行了小型研究。在这项工作中,我们跨越我们对Mogp中语义的理解,提出SDO:基于语义的距离作为额外标准。这自然鼓励Mogp中的语义多样性。为此,我们在第一个帕累托前面的较密集的区域(最有前途的前沿)找到一个枢轴。然后,这用于计算枢轴与人群中的每个人之间的距离。然后将所得到的距离用作优化以优化以偏及语义分集的额外标准。我们还使用其他基于语义的方法作为基准,称为基于语义相似性的交叉和语义的拥挤距离。此外,我们也使用NSGA-II和SPEA2进行比较。我们使用高度不平衡二进制分类问题,一致地展示我们所提出的SDO方法如何产生更多非主导的解决方案和更好的多样性,导致更好的统计学显着的结果,与其他四种方法相比,使用超卓越症结果作为评估措施。
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非主导的分类遗传算法II(NSGA-II)是现实应用中最强烈使用的多目标进化算法(MOEA)。然而,与几个通过数学手段分析的几个简单的MOES相反,到目前为止,NSGA-II也不存在这种研究。在这项工作中,我们表明,数学运行时分析也可用于NSGA-II。结果,我们证明,由于持续因素大于帕累托前方大小的人口大小,具有两个经典突变算子的NSGA-II和三种不同的选择父母的方式满足与Semo和GSEMO相同的渐近运行时保证基本ineminmax和Lotz基准函数的算法。但是,如果人口大小仅等于帕累托前面的大小,那么NSGA-II就无法有效地计算完整的帕累托前部(对于指数迭代,人口总是错过帕累托前部的恒定分数) 。我们的实验证实了上述研究结果。
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我们最近提出了安全的 - 解决方案和健身进化 - 一种相应的协调算法,该算法维持两个共同发展的人群:候选解决方案和候选目标函数的种群。我们表明,安全在机器人迷宫领域内发展溶液的成功。本文中,我们介绍了Safe的适应和对多目标问题的应用的研究,其中候选目标功能探索了每个目标的不同权重。尽管初步的结果表明,安全以及共同发展的解决方案和目标功能的概念可以识别一组类似的最佳多物镜解决方案,而无需显式使用帕累托前锋进行健身计算和父母选择。这些发现支持我们的假设,即安全算法概念不仅可以解决复杂的问题,而且可以适应多个目标问题的挑战。
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The NSGA-II is one of the most prominent algorithms to solve multi-objective optimization problems. Despite numerous successful applications, several studies have shown that the NSGA-II is less effective for larger numbers of objectives. In this work, we use mathematical runtime analyses to rigorously demonstrate and quantify this phenomenon. We show that even on the simple OneMinMax benchmark, where every solution is Pareto optimal, the NSGA-II also with large population sizes cannot compute the full Pareto front (objective vectors of all Pareto optima) in sub-exponential time when the number of objectives is at least three. Our proofs suggest that the reason for this unexpected behavior lies in the fact that in the computation of the crowding distance, the different objectives are regarded independently. This is not a problem for two objectives, where any sorting of a pair-wise incomparable set of solutions according to one objective is also such a sorting according to the other objective (in the inverse order).
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Most multimodal multi-objective evolutionary algorithms (MMEAs) aim to find all global Pareto optimal sets (PSs) for a multimodal multi-objective optimization problem (MMOP). However, in real-world problems, decision makers (DMs) may be also interested in local PSs. Also, searching for both global and local PSs is more general in view of dealing with MMOPs, which can be seen as a generalized MMOP. In addition, the state-of-the-art MMEAs exhibit poor convergence on high-dimension MMOPs. To address the above two issues, in this study, a novel coevolutionary framework termed CoMMEA for multimodal multi-objective optimization is proposed to better obtain both global and local PSs, and simultaneously, to improve the convergence performance in dealing with high-dimension MMOPs. Specifically, the CoMMEA introduces two archives to the search process, and coevolves them simultaneously through effective knowledge transfer. The convergence archive assists the CoMMEA to quickly approaching the Pareto optimal front (PF). The knowledge of the converged solutions is then transferred to the diversity archive which utilizes the local convergence indicator and the $\epsilon$-dominance-based method to obtain global and local PSs effectively. Experimental results show that CoMMEA is competitive compared to seven state-of-the-art MMEAs on fifty-four complex MMOPs.
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许多现实世界优化问题,如工程最优设计,最终可以被建模为必须解决的相应多目标优化问题(MOPS),以获得近似帕累托最佳前端。基于分解(MOEA / D)的多目标进化算法被认为是解决MOP的明显有希望的方法。最近的研究表明,具有均匀重量载体的MoEA / D非常适合于普通帕累托最佳前端的拖把,但在多样性方面的性能通常会在解决带有不规则帕累托最佳方向时造成拖镜时劣化。以这种方式,通过该算法获得的解决方案集不能为决策者提供更合理的选择。为了有效地克服这一缺点,我们通过众所周知的Pascoletti-Serafini标定方法和多参考点的新策略提出了一种改进的MoA / D算法。具体地,该策略包括由等距分区和投影的技术产生的参考点的设置和调整组成。对于性能评估,将所提出的算法与现有的四个最先进的多目标进化算法进行比较,这些算法与各种类型的帕累托最优前锋和两个现实世界拖把的基准测试问题相比,包括舱口盖设计和火箭喷射器设计在工程优化中。根据实验结果,所提出的算法表现出比其他比较算法更好的分集性能。
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我们对两个单目标和两个多目标的全局全局优化算法进行了全面的全局灵敏度分析,作为算法配置问题。也就是说,我们研究了超参数对算法的直接效果和与其他超参数的效果的影响的影响质量。使用三种敏感性分析方法Morris LHS,Morris和Sobol,可以系统地分析协方差矩阵适应进化策略,差异进化,非主导的遗传算法III和多目标进化算法的可调型矩阵适应性进化策略,基于框架的分解,基于框架揭示,基于框架的遗传算法,超参数对抽样方法和性能指标的行为。也就是说,它回答了等问题,例如什么超参数会影响模式,它们的互动方式,相互作用的互动程度以及其直接影响程度。因此,超参数的排名表明它们的调整顺序,影响模式揭示了算法的稳定性。
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In today's uncertain and competitive market, where enterprises are subjected to increasingly shortened product life-cycles and frequent volume changes, reconfigurable manufacturing systems (RMS) applications play a significant role in the manufacturing industry's success. Despite the advantages offered by RMS, achieving a high-efficiency degree constitutes a challenging task for stakeholders and decision-makers when they face the trade-off decisions inherent in these complex systems. This study addresses work tasks and resource allocations to workstations together with buffer capacity allocation in RMS. The aim is to simultaneously maximize throughput and minimize total buffer capacity under fluctuating production volumes and capacity changes while considering the stochastic behavior of the system. An enhanced simulation-based multi-objective optimization (SMO) approach with customized simulation and optimization components is proposed to address the abovementioned challenges. Apart from presenting the optimal solutions subject to volume and capacity changes, the proposed approach support decision-makers with discovered knowledge to further understand the RMS design. In particular, this study presents a problem-specific customized SMO combined with a novel flexible pattern mining method for optimizing RMS and conducting post-optimal analyzes. To this extent, this study demonstrates the benefits of applying SMO and knowledge discovery methods for fast decision-support and production planning of RMS.
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自由形式变形模型可以通过在图像上操纵控制点晶格来代表广泛的非刚性变形。但是,由于大量参数,由于适应性景观的复杂性,将自由形式变形模型直接拟合到变形图像以进行变形估计是一项挑战。在本文中,我们根据每个控制点影响的区域相互重叠的事实,将注册任务作为多目标优化问题(MOP)。具体而言,通过将模板图像划分为几个区域并独立测量每个区域的相似性,可以通过使用现成的多目标进化算法(MOEAS)来解决多个目标,并可以通过解决拖把来实现变形估计。此外,图像金字塔与控制点网格细分结合使用了粗到五个策略。具体而言,当前图像级别的优化候选解决方案是由下一个级别继承的,这增加了处理大变形的能力。此外,提出了一个后处理过程,以利用帕累托最佳解决方案生成单个输出。对合成图像和现实世界图像的比较实验显示了我们变形估计方法的有效性和实用性。
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在多目标优化中,一组具有各种功能的可扩展测试问题使研究人员可以调查和评估不同优化算法的能力,因此可以帮助他们设计和开发更有效,更有效的方法。现有的测试问题套件主要集中在所有目标彼此完全冲突的情况下。在这种情况下,目标空间中的M-Obigntive优化问题具有(M-1)维帕累托前沿。但是,在某些优化问题中,目标之间可能存在意外的特征,例如冗余。某些目标的冗余可能会导致具有堕落的帕累托正面的多物镜问题,即,$ m $ - 目标问题的帕累托正面的尺寸小于(M-1)。在本文中,我们系统地研究了退化的多目标问题。我们抽象了退化问题的三个一般特征,这些特征未在文献中进行制定和系统地研究。基于这些特征,我们提出了一组测试问题,以支持在具有冗余目标的情况下对多目标优化算法进行研究。据我们所知,这项工作是第一项明确提出退化问题的三个特征,从而使所得的测试问题的一般性具有一般性的特征,与为特定目的设计的现有测试问题相比(例如,可视化),则允许所得的测试问题。 )。
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Multi-objective feature selection is one of the most significant issues in the field of pattern recognition. It is challenging because it maximizes the classification performance and, at the same time, minimizes the number of selected features, and the mentioned two objectives are usually conflicting. To achieve a better Pareto optimal solution, metaheuristic optimization methods are widely used in many studies. However, the main drawback is the exploration of a large search space. Another problem with multi-objective feature selection approaches is the interaction between features. Selecting correlated features has negative effect on classification performance. To tackle these problems, we present a novel multi-objective feature selection method that has several advantages. Firstly, it considers the interaction between features using an advanced probability scheme. Secondly, it is based on the Pareto Archived Evolution Strategy (PAES) method that has several advantages such as simplicity and its speed in exploring the solution space. However, we improve the structure of PAES in such a way that generates the offsprings, intelligently. Thus, the proposed method utilizes the introduced probability scheme to produce more promising offsprings. Finally, it is equipped with a novel strategy that guides it to find the optimum number of features through the process of evolution. The experimental results show a significant improvement in finding the optimal Pareto front compared to state-of-the-art methods on different real-world datasets.
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经验丰富的用户通常在解决现实世界优化问题方面具有有用的知识和直觉。用户知识可以作为可变关系的配方,以帮助优化算法更快地找到良好的解决方案。此类间相互作用也可以自动从优化运行中的中间迭代中发现的高性能解决方案中自动学习 - 一种称为Innovization的过程。如果用户对这些关系进行审查,则可以在新生成的解决方案中执行,以将优化算法引导到搜索空间中实际上有希望的区域。对于大规模问题,这种可变关系的数量可能很高,就会出现挑战。本文提出了一个基于交互式知识的进化多目标优化(IK-EMO)框架,该框架将隐藏的可变关系提取为从不断发展的高性能解决方案中的知识,与用户共享它们以接收反馈,并将其应用于优化提高其有效性的过程。知识提取过程使用系统而优雅的图形分析方法,该方法与变量数量很好地缩放。在三个大规模的现实世界工程设计问题上证明了拟议的IK-EMO的工作。提出的知识提取过程和高性能解决方案的实现的简单性和优雅迅速表明了所提出的框架的力量。提出的结果应激发进一步的基于相互作用的优化研究,以实践其常规使用。
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最近,已经进行了多目标进化优化器NSGA-II的第一个数学运行时分析(AAAI 2022,GECCO 2022(出现),ARXIV 2022)。我们通过对由两个多模式目标组成的基准问题进行该算法的第一个运行时分析继续进行这一研究。我们证明,如果人口尺寸$ n $至少是帕累托阵线的四倍,那么NSGA-II具有四种不同方法的NSGA-II选择父母,并且位于Bit Wise突变将优化OnejumpzeroJump基准,其跳高尺寸〜$ 2 \ le lek \ le n/4 $ in Time $ o(n n^k)$。当使用快速突变(最近提出的重型突变操作员)时,此保证将提高$ k^{\ omega(k)} $。总体而言,这项工作表明,NSGA-II至少与全球SEMO算法有关OnejumpZeroJump问题的局部优势。
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Explicitly accounting for uncertainties is paramount to the safety of engineering structures. Optimization which is often carried out at the early stage of the structural design offers an ideal framework for this task. When the uncertainties are mainly affecting the objective function, robust design optimization is traditionally considered. This work further assumes the existence of multiple and competing objective functions that need to be dealt with simultaneously. The optimization problem is formulated by considering quantiles of the objective functions which allows for the combination of both optimality and robustness in a single metric. By introducing the concept of common random numbers, the resulting nested optimization problem may be solved using a general-purpose solver, herein the non-dominated sorting genetic algorithm (NSGA-II). The computational cost of such an approach is however a serious hurdle to its application in real-world problems. We therefore propose a surrogate-assisted approach using Kriging as an inexpensive approximation of the associated computational model. The proposed approach consists of sequentially carrying out NSGA-II while using an adaptively built Kriging model to estimate the quantiles. Finally, the methodology is adapted to account for mixed categorical-continuous parameters as the applications involve the selection of qualitative design parameters as well. The methodology is first applied to two analytical examples showing its efficiency. The third application relates to the selection of optimal renovation scenarios of a building considering both its life cycle cost and environmental impact. It shows that when it comes to renovation, the heating system replacement should be the priority.
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Parallel evolutionary algorithms (PEAs) have been studied for reducing the execution time of evolutionary algorithms by utilizing parallel computing. An asynchronous PEA (APEA) is a scheme of PEAs that increases computational efficiency by generating a new solution immediately after a solution evaluation completes without the idling time of computing nodes. However, because APEA gives more search opportunities to solutions with shorter evaluation times, the evaluation time bias of solutions negatively affects the search performance. To overcome this drawback, this paper proposes a new parent selection method to reduce the effect of evaluation time bias in APEAs. The proposed method considers the search frequency of solutions and selects the parent solutions so that the search progress in the population is uniform regardless of the evaluation time bias. This paper conducts experiments on multi-objective optimization problems that simulate the evaluation time bias. The experiments use NSGA-III, a well-known multi-objective evolutionary algorithm, and compare the proposed method with the conventional synchronous/asynchronous parallelization. The experimental results reveal that the proposed method can reduce the effect of the evaluation time bias while reducing the computing time of the parallel NSGA-III.
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基准套件提供了对进化算法解决问题能力的有用度量,但是组成问题通常太复杂了,无法清洁算法的优势和劣势。在这里,我们介绍了基准套件档案(``进化运行中的选择方案的诊断概述''),以实证分析有关剥削和探索重要方面的选择方案。利用从根本上是攀岩,但我们考虑两种情况:纯剥削,可以独立优化表示形式中的每个位置,并且受到限制的利用,在该位置之间,由于位置之间的相互作用,向上进展更加有限。当优化路径不太清楚时,需要探索;我们认为能够遵循多个独立的爬山途径和跨健身山谷的能力。这些场景的每种组合都会产生独特的适应性景观,有助于表征与给定选择方案相关的进化动力学。我们分析了六个流行的选择方案。锦标赛的选择和截断选择都在剥削指标方面表现出色,但在需要探索时表现不佳;相反,新颖的搜索在探索方面表现出色,但未能利用梯度。在克服欺骗时,健身共享表现良好,但在所有其他诊断方面都很差。非主导的分类是维持由居住在多个Optima居住的个体组成的不同人群的最佳选择,但努力有效利用梯度。词汇酶选择平衡搜索空间探索而不牺牲剥削,通常在诊断方面表现良好。我们的工作证明了诊断对快速建立对选择方案特征的直观理解的价值,然后可以将其用于改进或开发新的选择方法。
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