CodeReclaimers / neat-python

87%

Build Type

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>

Coverage Stats

12 of 12 new or added lines in 2 files covered. (100.0%)

1 existing line in 1 file now uncovered.

2215 of 2546 relevant lines covered (87.0%)

0.87 hits per line