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June 2015

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Subject:
From:
Eric 'Siggy' Scott <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Date:
Wed, 3 Jun 2015 04:20:58 -0400
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Dear Wizards,

The JavaDoc for FloatVectorSpecies claims that when using Guassian
mutation, "if the gene-by-gene range is used, than the standard deviation
is scaled to reflect each gene's range."

As far as I can tell, however, this doesn't actually happen.  Stepping
through the debugger with the following mutation parameters, I can watch
DoubleVectorIndividual.gaussianMutation() as it samples from a std of 0.1
when mutation gene 0.  I would have expected it to scale the std to be
0.0001 or such.

pop.subpop.0.species.min-gene =         -1.0
pop.subpop.0.species.max-gene =         1.0
pop.subpop.0.species.min-gene.0 =         -.001
pop.subpop.0.species.max-gene.0 =         .001
pop.subpop.0.species.mutation-type =    gauss
pop.subpop.0.species.mutation-stdev =   0.1
pop.subpop.0.species.mutation-bounded = true
pop.subpop.0.species.mutation-prob =    0.03


Is this an error in the documentation? Or am I missing something?

Thanks,
Siggy

-- 

Ph.D student in Computer Science
George Mason University
http://mason.gmu.edu/~escott8/


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