Support 1D Search Spaces in CmaEsSampler#6228
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c-bata merged 7 commits intooptuna:masterfrom Aug 7, 2025
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Other options of CmaEsSampler worked without errors even when using a 1D search space. |
y0z
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Aug 1, 2025
optuna/samplers/_cmaes.py
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| sigma0 = max(sigma0, _EPS) | ||
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| if self._use_separable_cma: | ||
| if self._use_separable_cma and not is_single_dimension: |
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It would be helpful to issue a warning when attempting to use sepCMA in 1D, as it is meaningless.
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@kAIto47802 Could you review this PR? |
CmaEsSampler
y0z
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Aug 4, 2025
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LGTM.
I also confirmed that this change works with_margin=True.
optuna.samplers.CmaEsSampler(seed=42, with_margin=True)
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Let me re-assign from @kAIto47802 to @y0z ! |
c-bata
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Aug 5, 2025
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Thank you for your pull request. I left two suggestions.
optuna/samplers/_cmaes.py
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| self, | ||
| trans: _SearchSpaceTransform, | ||
| direction: StudyDirection, | ||
| is_single_dimension: bool, |
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How about checking trans.bounds instead of adding a new argument here?
c-bata
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LGTM. Thank you for the update.
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Motivation
Thanks to CMA-ES PR #190, the CMA-ES library now supports 1-dimensional search spaces. This PR updates CmaEsSampler to allow the use of 1D search spaces accordingly.
Description of the changes
use_separable_cma=Trueand the search space is 1D.cmaesversion inpyproject.toml.