MOEA mu+lamda loosing diversity

Multi tool use
Multi tool use












0














I'm using deap to solve an optimization (2 parameter minimization) with multiple objective using NSGAII and im seeing a NOT monotonically decreasing fitness. This goes hand in hand with a loss of diversity at the generations just before the increase in fitness value.



Unrolling all functions used in deap showed that after the sorting, all individuals needed for a selection of mu ones lie on the first front. Thats ok I guess. This front, however, looses diversity. After a few more generations, only one "type" of individual is left, that is having mu individuals that are absolutely equal.



At this point, I feel it is connected to my parameters..
Let's go back to basics: Are my settings massively flawed? Im using:



mu, lamda = 50,500



with



CX,MUT, IN_MUT = 0.35,0.4, 0.1



My train of thought here: I create 500 offsprings where 25% are taken from the population (e.g. 125) and then select 50 from the 550 containing (125 + 50=) 175 old ones. Maybe my issue is actually with this setting....Can anyone help to elaborate?



Since the code is a bit longer, a working example can be found on the gist here



https://gist.github.com/max3-2/8370cd60e85b2941d7b526c0cb6d7a47










share|improve this question



























    0














    I'm using deap to solve an optimization (2 parameter minimization) with multiple objective using NSGAII and im seeing a NOT monotonically decreasing fitness. This goes hand in hand with a loss of diversity at the generations just before the increase in fitness value.



    Unrolling all functions used in deap showed that after the sorting, all individuals needed for a selection of mu ones lie on the first front. Thats ok I guess. This front, however, looses diversity. After a few more generations, only one "type" of individual is left, that is having mu individuals that are absolutely equal.



    At this point, I feel it is connected to my parameters..
    Let's go back to basics: Are my settings massively flawed? Im using:



    mu, lamda = 50,500



    with



    CX,MUT, IN_MUT = 0.35,0.4, 0.1



    My train of thought here: I create 500 offsprings where 25% are taken from the population (e.g. 125) and then select 50 from the 550 containing (125 + 50=) 175 old ones. Maybe my issue is actually with this setting....Can anyone help to elaborate?



    Since the code is a bit longer, a working example can be found on the gist here



    https://gist.github.com/max3-2/8370cd60e85b2941d7b526c0cb6d7a47










    share|improve this question

























      0












      0








      0







      I'm using deap to solve an optimization (2 parameter minimization) with multiple objective using NSGAII and im seeing a NOT monotonically decreasing fitness. This goes hand in hand with a loss of diversity at the generations just before the increase in fitness value.



      Unrolling all functions used in deap showed that after the sorting, all individuals needed for a selection of mu ones lie on the first front. Thats ok I guess. This front, however, looses diversity. After a few more generations, only one "type" of individual is left, that is having mu individuals that are absolutely equal.



      At this point, I feel it is connected to my parameters..
      Let's go back to basics: Are my settings massively flawed? Im using:



      mu, lamda = 50,500



      with



      CX,MUT, IN_MUT = 0.35,0.4, 0.1



      My train of thought here: I create 500 offsprings where 25% are taken from the population (e.g. 125) and then select 50 from the 550 containing (125 + 50=) 175 old ones. Maybe my issue is actually with this setting....Can anyone help to elaborate?



      Since the code is a bit longer, a working example can be found on the gist here



      https://gist.github.com/max3-2/8370cd60e85b2941d7b526c0cb6d7a47










      share|improve this question













      I'm using deap to solve an optimization (2 parameter minimization) with multiple objective using NSGAII and im seeing a NOT monotonically decreasing fitness. This goes hand in hand with a loss of diversity at the generations just before the increase in fitness value.



      Unrolling all functions used in deap showed that after the sorting, all individuals needed for a selection of mu ones lie on the first front. Thats ok I guess. This front, however, looses diversity. After a few more generations, only one "type" of individual is left, that is having mu individuals that are absolutely equal.



      At this point, I feel it is connected to my parameters..
      Let's go back to basics: Are my settings massively flawed? Im using:



      mu, lamda = 50,500



      with



      CX,MUT, IN_MUT = 0.35,0.4, 0.1



      My train of thought here: I create 500 offsprings where 25% are taken from the population (e.g. 125) and then select 50 from the 550 containing (125 + 50=) 175 old ones. Maybe my issue is actually with this setting....Can anyone help to elaborate?



      Since the code is a bit longer, a working example can be found on the gist here



      https://gist.github.com/max3-2/8370cd60e85b2941d7b526c0cb6d7a47







      python evolutionary-algorithm deap






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 27 at 13:23









      Max

      955




      955





























          active

          oldest

          votes











          Your Answer






          StackExchange.ifUsing("editor", function () {
          StackExchange.using("externalEditor", function () {
          StackExchange.using("snippets", function () {
          StackExchange.snippets.init();
          });
          });
          }, "code-snippets");

          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "1"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: true,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: 10,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53945821%2fmoea-mulamda-loosing-diversity%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown






























          active

          oldest

          votes













          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Stack Overflow!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.





          Some of your past answers have not been well-received, and you're in danger of being blocked from answering.


          Please pay close attention to the following guidance:


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53945821%2fmoea-mulamda-loosing-diversity%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          t4MCMFUZf1TIL0,pmqlqUWSCI,V4B 3Xj,LR,oHc4YrBNGp3vVKiDnxCDBY,q7O97z5bPVYa3E,UmFEdKK4,28pdg,iKjhTb,0rSJGqHnHom0
          7 sf IGLrZQcwjN SsYgi 0tmEk

          Popular posts from this blog

          Monofisismo

          Angular Downloading a file using contenturl with Basic Authentication

          Olmecas