I have been struggling with Galapagos or Octopus for optimization

Hello everyone,

I am seeking your general advice in terms of using Galapagos/Octopus. I do not know whether it is the display issue associated with my computer only, I always start with blank interface when I start running Galapagos/Octopus (below is "room orientation optimization" shared at http://hydrashare.github.io/hydra/viewer?owner=mostaphaRoudsari&...) It may take quite some time to see some results. That's fine for the above simulation. But my real challenge is, when I am going to optimize room dimension with respect to ASE and sDA calculations, either Galapagos or Octopus goes wildly and never come up with a solution. I believe the time-consuming calculation, especially sDA with higher -ab numbers, trigger the lag a lot? Any suggestion/trick to improve it?

Most importantly, based on your experience, for example to optimize window/exterior shades sizes and achieve ASE<10% and sDA>55% (LEED v.4 requirements), Octopus (due to its capacity of multiple objectives) is the only choice? Any other approaches within grasshopper?

Many thank!

Cheney

Replies to This Discussion

Permalink Reply by David Rutten on June 27, 2016 at 2:14pm

The more variables you have the larger the search space, and the longer each iteration takes the longer it will last. So if you have both many variables and an expensive computation, it may become prohibitively slow.

Permalink Reply by Cheney on June 27, 2016 at 3:18pm

Thanks David for the feedback.

I am able to limit variables to be one each time but I am not able to reduce the expensive computation of sDA. Does it still make sense to use octopus?

Also a newbie question about setting threshold in octopus. sDA and ASE output ranges from 0 to 100. Am I right to say, for my LEED calculation, sDA max 55 and ASE max 10 are the threshold I should stick with?

Regards, Cheney

Permalink Reply by Devang Chauhan on November 16, 2016 at 11:18am

Hi David,

I am facing the similar problem. In my case, I clearly see the numbers in sliders and fitness changing rapidly, but no gene is displayed in Galapagos window. Is there a remedy?

My file uses several plugins to run so I am only attaching images of galapagos results.

Thanks,

Devang

Attachments:

01.png, 81 KB
02.png, 66 KB

Permalink Reply by Cheney on June 27, 2016 at 2:27pm

The alternative approach in my mind as a GH beginner is as follows. But I am not sure whether it is doable. Your comments will be greatly appreciated.

Since all my room/window/shades dimension are controlled by number sliders, I am thinking whether a component from GH will trigger these number sliders (not necessary to be all of them but one by one) automatically. If this is possible, I can do "data recorder" to record outputs from ASE and sDA. Eventually I will have a database of the input parameters and sDA/ASE results.

Does it make sense? Is there a component which can trigger number slider output at certain step?

Permalink Reply by Andy Lee on November 15, 2016 at 2:38am

Hi Cheney, I have a question which is exactly similar to the question that you asked everyone here. Have you ever solved those issues successfully? If you got it, could you please share me what you have? Because I am also newbie in these things. I am also confused in choosing Galapagos or Octopus as my research also based on optimizing building configuration to satisfy the best SDA and ASE in LEEDv4.

Thank you in advance and hope to hear you soon!

Best!

Andy

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