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Ran 23 May 2026 10:31AM UTC

Files 30

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Committed 23 May 2026 10:30AM UTC coverage: 86.999% (-0.004%) from 87.003%

Job # 26330410885.1

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push

github

Committed by

CodeReclaimers

Commit Message

Add disable_rule config flag for 75% crossover rule (#292)

Adds a `disable_rule` parameter to `[DefaultGenome]` so users can opt
into Stanley's reference NEAT C++ behavior alongside the current
neat-python semantics. Default remains `neat-python` (no behavior change
for existing configs).

- `neat-python`: when either parent has the gene disabled, replace the
  randomly-inherited `enabled` with a fresh Bernoulli(0.25) — 75%
  disabled regardless of how many parents had it disabled.
- `stanley`: random inherit, then 75% force-disable layered on top if
  either parent disabled — ~87.5% disabled with one parent disabled,
  100% disabled with both.

Threaded through `BaseGene.crossover()` as a keyword argument with a
backwards-compatible default so direct callers (tests, etc.) keep
working. Validated at config load.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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