ʕ◔ϖ◔ʔ v0.6.0

New feature

• Support IPOP-CMA-ES and BI-POP-CMA-ES algorithm (#131, #135, #136, #141)
  • Please check the benchmark results on two-dimensional Rastrigin function at #141.
  • Auger, A., Hansen, N.: A restart CMA evolution strategy with increasing population size. In: Proceedings of the 2005 IEEE Congress on Evolutionary Computation (CEC’2005), pp. 1769–1776 (2005a)
  • Hansen N. Benchmarking a BI-Population CMA-ES on the BBOB-2009 Function Testbed. In the workshop Proceedings of the Genetic and Evolutionary Computation Conference, GECCO, pages 2389–2395. ACM, 2009.
• Add BlackHoleStorage towards 100k+ evaluations (#105)
• Add TPE sampler options (#127)

API changes

Pruning (Early-stopping) APIs are changed without backward compatibility.

While I added an example which uses successive halving pruner at #120, I found a lot of issues. I'm sure that nobody uses pruning functionalities (I also confirmed that Kubeflow/Katib and sile/kurobako-go does not use pruning functionalities). So I fixes those issues. And I merge it without backward compatibility.

• Fix typo of OptionSetReductionFactor
• Alter the argument of trial.ShouldPrune() and remove trial.Report().

Some APIs are renamed without breaking changes.

These changes are added with backward compatibilities. Older functions are deprecated.

• Rename RandomSearchSampler to RandomSampler (#137).
• Rename StudyOptionSetDirection to StudyOptionDirection (#138).
• Rename StudyOptionSetTrialNotifyChannel to StudyOptionTrialNotifyChannel (#138).

Minor bug fixes

• Fix IntUniformDistribution.ToExternalRepr() (#102)
• Fix IntUniformDistributions.Contains() (#103)
• Fix a bug when set attrs multiple times (#121)
• CMA-ES: fix numerical overflow errors (#126)
• Fix a bug of successive halving pruner (#120)

Example

• Add an example of Gorgonia hyperparameter optimization with early stopping (ASHA) (#118, #119 and #120)