Genetic Algorithm (ga) terminating after a few generations

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agion
agion 2023년 8월 15일
답변: Alan Weiss 2023년 8월 16일
I am running a minimization calculation using the ga function. I've noticed that the ga function continually terminates after ~3 generations. This seems to be premature; however, the results I am getting are consistent. I have 6 design variables and a population of 1000 that is evenly gridded across reasonable values for each variable. In total the ga usually calls the objective function 10^5 times before terminating and meets the function and constraint tolerances (both 10^-6). I am curious to know if terminating after 3 generations is a "normal" behavior or if this indicates a problem with my objective function. Any help is greatly appreciated.

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Star Strider
Star Strider 2023년 8월 15일
That is certainly consistent if it converges quickly, and especially if it produces a reasonable result. If your 'InitialPopulationMatrix' is (1000x6) then it is quite possible that it finds a good fit in 3 generations. (I generally use smaller matrices.)
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agion
agion 2023년 8월 15일
Thank you for the information. I will take a look at those options.
Star Strider
Star Strider 2023년 8월 15일
As always, my pleasure!

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Alan Weiss
Alan Weiss 2023년 8월 16일
Almost certainly this is because you use nonlinear constraints. When you use nonlinear constraints, there are very few major iterations in the solver. For an example, see https://www.mathworks.com/help/gads/constrained-minimization-using-ga.html.
Alan Weiss
MATLAB mathematical toolbox documentation

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