Metacreator #1
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Metacreator #1
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The usage of metaclass allow us to stop registering Ephemeral classes in the gp module global scope. We also register the __reduce__ function of MetaEphemeral so Ephemeral could easily be pickled, as long as the ephemeral function is picklable (i.e.: no lambda function). The metaclass also has a cache based on class id to avoid creating new object for the same ephemeral when unpickling.
lambda can't pickled and will never be picklable. The test was failing because of Python incapicity to pickle lambdas, not because of MetaEphemeral logic. Therefore, I am replacing lambda by a partial and plan to do it for every examples in GP.
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Fixes Issues with pickeling EphemeralConstats as described in:
DEAP#76
DEAP#280