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Similar methodology to mine, and the same problem.
Many times it will find the minima well within your 1000 generations; but on those occasions where it settles into a false minima; it doesn't (seem to; limited runs) matter how many more generations you run it for; it will never find it.
That's what I've been trying to find a solution to for the last couple of days. So far, without much success.
The problem appears to be that if you discard too vigorously, you settle into re-trying variations of the same paths over and over without ever introducing any "new blood".
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.