Grasshopper

algorithmic modeling for Rhino

Hi,

this might have been covered in another post - thanks in advance for any pointers...

 

Is it possible to save the entire last generation of a Galapagos run? When not converging on a single obvious solution, it would be nice if the top 10 solutions could be 'played back' at a later point.

 

The Record tab in the Galapagos Editor lists some parameters for all individuals in all generations but it is unclear to me which number in the "Genes [x% · y% · z%]"-listing refers to which input slider.

 

(Also, why does the fitness result in a Not-A-Number in (many) cases?)

 

cheers,

wim

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Replies to This Discussion

Hi Wim,

no, not yet, sorry. Saving out Galapagos species to a file is on the list.

I don't know why you're getting a lot of NaNs, your network must be failing for certain slider positions. It might be a logical problem (divide by zero, overflow error), or it might be a bug in one of my components or it might be a bug in one of our Rhino SDK functions.

--
David Rutten
david@mcneel.com
Seattle, WA
Hi David,
OK, no problem, I'll be looking forward to you getting to that point on the wish list - we're getting close to Christmas anyway... :-)

About the NaN's. I didn't get any in the last run (397 generations of 50 individuals) of the same model that I got NaN's on before. As far as I can tell, it shouldn't be a division by zero problem, I'm solving the following formula: (a/10*b)-(c*d)-(e*f)-(g*h). I did save the text outcome of the run but I'm not sure which gene is what so I'm not sure how to recreate the exact situation... Is there something you want me to try?

BTW, what is a collision?

cheers,
wim

Genome[24], Fitness=-300.29, Genes [3% · 33% · 98% · 7%]
{
Record: Point Mutation at index 3: 0.0465 -> 0.0497
}
Genome[25], Fitness=NaN, Genes [3% · 33% · 98% · 9%]
{
Record: Genome was mutated to avoid collision

How do you get the parameters to appear in the record tab?? I cannot seem to find a way of doing this.  Many thanks

Hallo Wim, 

you could use a datasaver with a limit of e.g. 50 this should somehow save you the last 50 genoms.

Or you can develop a custom c# component reading every solution and filtering according to some definition.

I will provide some code samples later today...

That would be great. Thank you. William

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