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evolve-testbed

Circle packing testbed for the simple_evolve tmux Codex demo in scaling-evolve-core.

Problem: Place 26 circles in a unit square [0, 1]^2 to maximize the sum of their radii. Circles must not overlap each other or extend outside the square. The AlphaEvolve benchmark target is 2.635.

Files

  • candidate.py — mutation target. Defines construct_packing() which returns (centers, radii).
  • evaluate.py — local evaluator. Loads candidate.py, accepts only builtin numeric values, requires exactly 26 finite circles, validates the packing, recomputes sum(radii), and uses that calculated total as the score.

Manual evaluation

python3 evaluate.py

How the demo uses this repo

The demo coordinator (scaling-evolve-core) creates git worktrees from this repository, asks Codex to mutate candidate.py in each worktree, and then asks a separate Codex pane to run evaluate.py and write the result back.