Supporting reusable chromosomes #33
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Previous version 1.2.2 will no longer compile (it requires jfreechart 1.0.8 which no longer exists in the maven repo).
Now when the GenerationalEvolutionEngine is done with a chromosome, and the chromosome implements the Releasable interface, it calls chromosome.release(). This effectively allows that chromosome to be reused if that behavior is desired.
See HelloWorldGeneratorV2 or HelloWorldGneratorV2Test for this working.
Problem was waiting for UI to sync, a few extra robot.waitForIdle() did the trick.
Also updating programmers for this branch to just me. Not sure if that is the correct protocol, but at the same time I don't want to volunteer others to be contributors to my branch.
This works for now.
A termination validator that takes into account: 1. A minimum generation count, before even considering termination 2. A maximum generation count, once reached we consider it terminated 3. The history of the fitness function for each generation If we are between min/max number of generations, we look at the history of fitness function values for timesMustBeClose before the current generation. If each successive value is within closeEnough of the previous generation for timesMustBeClose, we consider it converged.
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In my particular usage of the watchmaker library my chromosomes are very large. Recreating them over and over was hurting performance badly. So I added a "Releasable" interface and made my chromosomes implement that. When GenerationalEvolutionEngine is done with a chromosome I added a couple of lines of code to check if the chromosome implements the Releasable interface, and if so it calls chromosome.release() prior to releasing it from the population.
This allows me to recirculate that object and avoid destroy/recreating objects. This change sped up my algorithm by a factor of 10+.
The majority of the code in this pull request is to add a unit test to make sure releasing is actually working, in addition to adding a simple ReleasablePool implementation.