Python rewrite of the Urb/Homemaker stack
Bruno Postle
8efe25601f
- §4.5: slide() re-randomises cuts (no fine-tuning operator exists) — strengthens the geometry-headroom explanation - §4.6: throughput arithmetic shows native fitness effectively gates topology search at scale; oracle suffices for Phase 1 + small Phase 2 - §5: new decision 6 — Lamarckian warm-start of the inner loop; penalty reshaping must preserve inner-loop cliff protection - §6: native-fitness port scope expanded (occlusion/daylight subsystem, cost denominator, structural failures, missing-space failure stacking, two-phase graph build, has_vertical_connection stub) - §7: Phase 2 re-scoped as small-scale proof with budgets in oracle evaluations; Phase 1 gains warm-vs-cold + optimiser bake-off experiments - §8: risks updated (reshaping tension, height DOF, confirmed t3 bug) |
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|---|---|---|
| .beads | ||
| .claude | ||
| experiments | ||
| src/homemaker | ||
| .gitignore | ||
| AGENTS.md | ||
| CLAUDE.md | ||
| DESIGN.md | ||
| pyproject.toml | ||
| README.md | ||
homemaker-py
Programme-driven building-layout search over slicing trees. A clean-room Python successor to the Perl Urb project, intended to eventually be 100% Python.
Why a rewrite
Urb represents a building as a binary slicing tree where room sizes are derived top-down from division ratios. That makes room area an emergent property of every cut above it, which:
- gives the genome low locality (a cut near the root rescales every descendant),
- makes target room sizes nearly impossible to hit, so the gaussian size penalty dominates fitness, and
- defeats crossover (transplanted subtrees lose their proportions).
homemaker inverts this: leaves carry target dimensions from the programme and division ratios are solved bottom-up for a fixed topology. The evolutionary search then only explores topology + types + adjacency.
Phase plan
- Solver experiment (current): port Urb's geometry, re-solve ratios from programme targets, score the result against the original via the Perl oracle.
- Native Python fitness (retire the Perl oracle).
- Canonical slicing encoding (normalized Polish expression) + memetic search.
Layout
src/homemaker/dom.py— read/write Urb.domYAML into aNodetree.src/homemaker/geometry.py— faithful port of Urb's top-down geometry.src/homemaker/programme.py— parsepatterns.configspace requirements.src/homemaker/solver.py— bottom-up ratio solve (scipy).src/homemaker/oracle.py— Phase-1 scaffold: score a.domvia Urb'surb-fitness.pl.
The Perl oracle is the only throwaway component; everything else is permanent.