Approximation Model Guided Selection for Evolutionary Multiobjective Optimization
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1 Approximation Model Guided Selection for Evolutionary Multiobjective Optimization Aimin Zhou 1, Qingfu Zhang 2, and Guixu Zhang 1 1 Each China Normal University, Shanghai, China 2 University of Essex, Colchester, UK 03/2013
2 Outline Background Approximation Model Guided Selection Experimental Results Discussions & Conclusions 2
3 Outline Background Approximation Model Guided Selection Experimental Results Discussions & Conclusions 3
4 Multiobjective Optimization Problem o Definition min F(x) = ( f 1 (x), f 2 (x),, f m (x)) s.t x D where D : decision (variable) space. f i : D R, objective function F : D R m, objective vector function f 2 Pareto set (PS) F o Pareto domination o Optimum Pareto set (PS) Pareto front (PF) Pareto front (PF) F(D) f 1 4
5 Target of MOEA o Find an approximation set, which is as diverse as possible as close to the PF (PS) as possible Pareto set (P) f 2 F Lower dimensional problems! F(D) Pareto front (PF) f 1 5
6 A General MOEA Framework Population o Reproduction Generate new trial solutions Reproduction Selection o Selection Select fittest ones into the next generation New Solutions 6
7 Dominance based Selection o Step 1: rank population dominance rank dominance count dominance strength o Step 2: estimate density niche and fitness sharing crowding distance K-nearest neighbor gridding Define a complete order over individuals! 7
8 Indicator based Selection o Convert an MOP into an SOP Obj. = performance metric Define a complete order over populations! 8
9 Model Guided Selection o Step 1: model the PF o Step 2: choose reference points o Step 3: select promising solutions Much work needs to be done along this direction! o o H. J. F. Moen, et al., Many-objective Optimization Using Taxi-Cab Surface Evolutionary Algorithm, EMO, H. Jain, and K. Deb, An improved Adaptive Appraoch for Elitist Nondominated Sorting Genetic Algorithm for Many-Objective Optimization, EMO,
10 Outline Background Approximation Model Guided Selection Experimental Results Discussions & Conclusions 10
11 AMS Framework Model PF Define sub-problem Select o o A. Zhou, Estimation of Distribution Algorithms for Continuous Multiobjective Optimization, Ph.D Thesis, University of Essex, (Chapter 5.3) A. Zhou, Q. Zhang, Y. Jin, and B. Sendhoff, Combination of EDA and DE for Continuous Biobjective Optimization, CEC o Q. Zhang and H. Li, MOEA/D: A Multiobjective Evolutionary Algorithm Based on Decomposition, IEEE Trans. on Evolutionary Computation,
12 Zero-order Approximation(AMS0) o A single point to approximate the PF o Model (ideal point) o Distance to utopian PF (sub-problem) Simple, but does not consider the shape of PF! 12
13 First-order Approximation(AMS1) o A simplex to approximate the PF o Model (vertices of simplex) o Distance to simplex Simple, and consider the shape of PF in a sense! 13
14 Outline Background Approximation Model Guided Selection Experimental Results Discussions & Conclusions 14
15 o Offspring reproduction operator A probability model based reproduction operator (RM-MEDA) o Comparison strategy NDS: non-dominated sorting scheme (NSGA-II) o Test instances 8 instances with different properties o Performance metric IGD: inverted general distance Settings 15
16 Convex PF NDS AMS0 AMS1 16
17 Concave PF NDS AMS0 AMS1 17
18 Tri-objective MOP NDS AMS0 AMS1 18
19 Statistical Results NDS:1 AMS0:4 AMS1:4 19
20 Outline Background Approximation Model Guided Selection Experimental Results Discussions & Conclusions 20
21 o AMS works better than NDS in most of the test instances o AMS0 is more stable than AMS1 o AMS1 works better than AMS0 if a good simplex model can be found stability of AMS stability of AMS order of model number of objectives 21
22 o How to build a high-quality model? model should be cheap model should be stable o What s the performance on complicated problems? non-concave (non-convex) with disconnected PF o What s the performance on many-objective problems? interesting sub-problems (reference points, targets points) 22
23 Thanks! The source code is available from 23
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