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ENH(mutation): add Gaussian noise to differential evolution - #135
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Add scalar and per-coordinate noise scales with a default of 1e-5 in mutation coordinates. Preserve particle dtype and allow zero noise to retain noise-free proposals and RNG consumption. Cover collapsed populations, seeded replay, scale validation, backend preservation, and correlated Gaussian target invariance.
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I'd like to make De the default but I realised the current version has a limitation because it doesn't add any noise.
Add scalar and per-coordinate noise scales with a default of 1e-5 in mutation coordinates. Preserve particle dtype and allow zero noise to retain noise-free proposals and RNG consumption.