NEAT-python library elitism not working as intended

Issue

This Content is from Stack Overflow. Question asked by nino dragičević

Im implementing NEAT algorithm in python via the NEAT-python library and I keep getting results that are not logical.
My elitism is set to 2, pop size is 30. species elitism is 1 and there is no stagnation.

Graph im getting has weird oscilations…
enter image description here

How is it possible for population’s best fitness to drop if I have elitism involved?

Also, I have noticed the oscilations happen only when 2 or more species is involved. Anyways, NEAT-python docs say that elitism takes the best from each species and just puts them into next generation, but that is clearly not working here…

Any ideas?



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