Constraint robust SGD & native multi-start#63
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simutisernestas merged 20 commits intomainfrom Apr 4, 2026
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…bution Add MultiStartOptimizer that distributes n_starts independent layout optimizations across JAX processes, selecting the global best via a single all-gather at the end. Includes _rank_seeds helper for reproducible round-robin seed assignment and full test coverage.
Replace the (best_x, best_y) return value with a frozen dataclass that exposes all gathered layouts and objectives alongside best_idx, giving callers access to the full ensemble rather than just the winner.
Remove SGDState, sgd_solve_implicit, boundary_penalty, spacing_penalty, preprocess_boundary, and MultiStartResult from the optim __init__. Tests that need internal helpers now import directly from pixwake.optim.sgd / pixwake.optim.multi_start.
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