Prevent Zero Elite Population

[nhansendev]

Small suggestion: When using small populations or small elite_ratio values it's easy for the elite_population value to become zero during strategy init: Ex: self.elite_popsize = int(self.popsize / 2 * self.elite_ratio) => int(0.3) => 0 Which can lead to zero-division errors, among other things.

Wrapping the calculation with max(1, *calculation*) could make sense to ensure non-zero elite populations, though I'm not sure if one is a valid value for all strategies.

[RobertTLange]

Hi @Obliman, sounds like a good idea. Yes, I believe 1 should be valid (and if not should simply require a reshape). Do you want to go ahead and open a PR? The strategies which feature elite_ratio are the following:

• PGPE
• ARS
• CMA_ES + variants
• SimpleES
• SimpleGA
• Full_iAMaLGaM/Indep_iAMaLGaM
• MA_ES
• LM_MA_ES
• RM_ES

[RobertTLange]

Addressed in #30