[NFC] clarify the choices in blackbox_optimizers - #575
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Mainly for type checkers or linters - they may believe (incorrectly) that `top_index` may be uninitialized.
Update filter_top_directions to rank antithetic pairs by max(R+, R-) instead of symmetric absolute difference |R+ - R-|, following the Augmented Random Search (ARS) standard (Mania et al., 2018). In non-smooth or bounded environments, large negative penalties (cliffs) produce massive absolute differences that dominate Top-K direction selection and displace directions that discover higher-reward peaks. Sorting by maximum reward focuses the update on the top-performing perturbations.
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Mainly for type checkers or linters - they may believe (incorrectly) that
top_indexmay be uninitialized.