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fix: respect per-dimension bins when sampling inspiration neighbors - #509
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codelion merged 1 commit intoOct 11, 2026
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With dictionary-valued
feature_bins, feature coordinates use each dimension’s configured size, but inspiration-neighborhood perturbations still clamp every coordinate toself.feature_bins - 1(the fallback size of 10). A parent at cell[18, 1]in a 20×2 grid therefore cannot reach its nearby[19, 1]candidate and falls back to random sampling. Narrow dimensions can also generate out-of-range coordinates.Clamp each perturbed coordinate using the same per-dimension bin count as feature placement.
Validation: 15 tests passed across
tests/test_inspiration_feature_bounds.py,tests/test_map_elites_features.py, andtests/test_sample_from_island_inspirations.py. The new test uses real feature coordinates and verifies that the nearby candidate is selected before random fallback; it fails before the fix. Official isort/Black pre-commit hooks andgit diff --checkpassed.