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Python rewrite of the Urb/Homemaker stack
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Bruno Postle 9e020f4769 Native fitness: adjacency graph + merge_divided (homemaker-py-3y7) 
Two bugs fixed in boundary_id / leaf_graph:
1. 'bid not in "abcd"' used Python substring check, silently dropping the
   root-division boundary (empty-string id).  Fixed to frozenset membership.
2. Upper-storey nodes store their own rotation in the YAML but Urb::Quad::Rotation
   delegates to Below->Rotation.  boundary_id now walks the below-chain to the
   ground-floor rotation, matching Perl exactly.

After fixes all 35 corpus files produce edge counts matching Perl oracle.

Added:
- src/homemaker/graph.py: build_graphs (two-phase pattern), has_adjacency,
  has_vertical_connection (faithful no-overlap stub per DESIGN §8.1),
  find_missing_spaces, check_adjacency, check_level_constraints,
  check_vertical_connectivity
- src/homemaker/dom.py: @dataclass(eq=False) on Node for NetworkX hashability;
  is_outside, is_supported, is_unsupported, merge_divided
- tests/test_graph.py: 7 tests, edge counts vs Perl oracle on all 35 files,
  exact widths for 2f45907, merge_divided smoke, two-phase independence

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-12 21:57:45 +01:00
.beads Native fitness: adjacency graph + merge_divided (homemaker-py-3y7) 2026-06-12 21:57:45 +01:00
.claude Scaffold homemaker-py with validated geometry port 2026-06-10 20:50:20 +01:00
experiments Use Urb's canonical UPPERCASE generic types (C/O); case-insensitive class checks 2026-06-12 19:01:53 +01:00
src/homemaker Native fitness: adjacency graph + merge_divided (homemaker-py-3y7) 2026-06-12 21:57:45 +01:00
tests Native fitness: adjacency graph + merge_divided (homemaker-py-3y7) 2026-06-12 21:57:45 +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.