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Python rewrite of the Urb/Homemaker stack
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Bruno Postle 13f73be771 Topology genome: base tree + per-storey deltas + type assignment 
genome.py (homemaker-py-k2g): Genome = base-floor GNode tree + per-storey
StoreyDelta (undivides, divide subtrees, leaf retypes, height) + base
metadata. encode/decode round-trips dom.py Node trees.

Key empirical finding baked into the design: upper-storey nodes carry
heavily drifted DEAD fields (97 inherited-cut divisions, 187 rotations
differ from the owning node below across the corpus) — dead because
geometry delegates to below before reading them. decode canonicalises
them; encode stores only owned state, so genomes from drifted sources
compare equal (fixed-point test).

Acceptance: 35/35 corpus files fitness-identical after round-trip through
the oracle (experiments/genome_parity.py, URB_NO_OCCLUSION=1); owned-cut
projection + genome fixed-point + storey counts in tests/test_genome.py
(16 tests pass).

Closes homemaker-py-k2g.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-06-12 13:52:32 +01:00
.beads Topology genome: base tree + per-storey deltas + type assignment 2026-06-12 13:52:32 +01:00
.claude Scaffold homemaker-py with validated geometry port 2026-06-10 20:50:20 +01:00
experiments Topology genome: base tree + per-storey deltas + type assignment 2026-06-12 13:52:32 +01:00
src/homemaker Topology genome: base tree + per-storey deltas + type assignment 2026-06-12 13:52:32 +01:00
tests Topology genome: base tree + per-storey deltas + type assignment 2026-06-12 13:52:32 +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 Scaffold homemaker-py with validated geometry port 2026-06-10 20:50:20 +01:00
DESIGN.md Re-baseline under URB_NO_OCCLUSION: new reference gains, DESIGN §4.7 2026-06-12 10:31:38 +01:00
pyproject.toml Geometry inner loop: batched full-objective ratio optimiser (CMA-ES) 2026-06-12 09:42:24 +01:00
README.md Scaffold homemaker-py with validated geometry port 2026-06-10 20:50:20 +01:00

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

  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.