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Python rewrite of the Urb/Homemaker stack
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Bruno Postle d330a9171c Add mutate_level_compound_fix: escape deceptive level-fix valley 
When level_fix alone displaces a required room (e.g. t3) it triggers 5
oracle fails for the missing room — far worse than the starting 2 fails,
so lex always rejects it.  level_compound_fix atomically: moves the
constrained room to its required floor AND re-inserts the displaced room
by splitting the sibling of the largest C leaf on that floor.  The C
sibling is guaranteed adjacent to C (shared parent split), so the
displaced room keeps its required C-adjacency.

On programme-house this jumps the warmstart from 2 fails (l1 wrong
level + t3 size) to 1 fail (staircase volume), which lex accepts as an
improvement and provides a new base for further mutation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-14 22:46:23 +01:00
.beads Close homemaker-py-g0b 2026-06-14 17:18:23 +01:00
.claude Scaffold homemaker-py with validated geometry port 2026-06-10 20:50:20 +01:00
examples Fix mutate_level_add: use generic C/O floor instead of room duplicate 2026-06-14 10:33:05 +01:00
experiments Lexicographic outer-search comparison, preserve inner-loop cliff (homemaker-py-yg5) 2026-06-14 09:20:03 +01:00
src/homemaker_layout Add mutate_level_compound_fix: escape deceptive level-fix valley 2026-06-14 22:46:23 +01:00
tests Lexicographic outer-search comparison, preserve inner-loop cliff (homemaker-py-yg5) 2026-06-14 09:20:03 +01:00
.gitignore bd init: initialize beads issue tracking 2026-06-11 23:27:11 +01:00
AGENTS.md bd init: initialize beads issue tracking 2026-06-11 23:27:11 +01:00
CLAUDE.md Fix stair-fit parity: entrance corners + weighted has_circulation (homemaker-py-w1e/q70) 2026-06-13 20:55:25 +01:00
DESIGN.md Lexicographic outer-search comparison, preserve inner-loop cliff (homemaker-py-yg5) 2026-06-14 09:20:03 +01:00
pyproject.toml Add core_divide, core_undivide, level_fix operators; wire reqs to mutate() 2026-06-14 16:10:20 +01:00
README.md Rename package: homemaker → homemaker-layout 2026-06-14 08:18:06 +01:00

README.md

homemaker-layout

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_layout/dom.py — read/write Urb .dom YAML into a Node tree.
  • src/homemaker_layout/geometry.py — faithful port of Urb's top-down geometry.
  • src/homemaker_layout/programme.py — parse patterns.config space requirements.
  • src/homemaker_layout/solver.py — bottom-up ratio solve (scipy).
  • src/homemaker_layout/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.