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

1. Solver experiment (current): port Urb's geometry, re-solve ratios from programme targets, score the result against the original via the Perl oracle.
2. Native Python fitness (retire the Perl oracle).
3. Canonical slicing encoding (normalized Polish expression) + memetic search.

Layout

• src/homemaker/dom.py — read/write Urb .dom YAML into a Node tree.
• src/homemaker/geometry.py — faithful port of Urb's top-down geometry.
• src/homemaker/programme.py — parse patterns.config space requirements.
• src/homemaker/solver.py — bottom-up ratio solve (scipy).
• src/homemaker/oracle.py — Phase-1 scaffold: score a .dom via Urb's urb-fitness.pl.

The Perl oracle is the only throwaway component; everything else is permanent.