homemaker-layout/experiments/run_coldstart_baseline.py

"""Cold-start re-baseline of the four example programmes (`homemaker-py-ssz` fallout).

The objective changed (DESIGN.md §38.10/§38.11: crinkliness is declared per
space), so every prior corpus fail count is stale. This re-runs all four
programmes cold, from `init.dom`, at a fixed budget.

Design notes, all of which matter for the result being trustworthy:

* **One worker per run, four runs at a time.** The box has 4 cores. Running
  four single-worker searches beats one four-worker search here: it saturates
  the cores just as well AND avoids `homemaker-py-b8g`, the parallel/BLAS
  non-determinism that makes `n_workers>1` runs irreproducible. A baseline
  nobody can reproduce is not a baseline.
* **Seed-major order.** The queue runs seed 0 of every programme, then seed 1,
  then seed 2 -- so if the box is lost half way we have all four programmes at
  fewer seeds, rather than one programme at three seeds and nothing else.
* **Commit and push after every finished run.** This is an ephemeral container;
  it is reclaimed on inactivity or session end. Anything not pushed is gone. Git
  calls are serialised under a lock file so the runner cannot race a human (or
  another agent) committing in the same tree.
* **Scored by the shipped scorer**, from inside the programme directory, exactly
  as CLAUDE.md requires -- `homemaker-fitness` resolves patterns.config and
  writes .score/.fails relative to cwd.

Usage::

    python experiments/run_coldstart_baseline.py --budget 500000 --seeds 3
    python experiments/run_coldstart_baseline.py --budget 2000 --seeds 1 --dry-run
"""

from __future__ import annotations

import argparse
import csv
import fcntl
import subprocess
import time
from contextlib import contextmanager
from pathlib import Path

REPO = Path(__file__).resolve().parent.parent
PROGRAMMES = ["harbor-house", "maple-court", "health-centre", "programme-house"]
LOCK = REPO / ".git" / "coldstart-git.lock"
RESULTS = REPO / "experiments" / "results" / "coldstart_baseline.tsv"
FIELDS = ["programme", "seed", "budget", "fails", "hard", "soft", "score",
          "elapsed_s", "dom"]


@contextmanager
def git_lock():
    LOCK.parent.mkdir(parents=True, exist_ok=True)
    with open(LOCK, "w") as fh:
        fcntl.flock(fh, fcntl.LOCK_EX)
        try:
            yield
        finally:
            fcntl.flock(fh, fcntl.LOCK_UN)


def score(dom_path: Path) -> tuple[int, int, int, float]:
    """(fails, hard, soft, score) via the shipped scorer, run from the
    programme dir as CLAUDE.md requires."""
    from homemaker_layout.fitness import classify_fail_tier
    subprocess.run(["homemaker-fitness", dom_path.name],
                   cwd=dom_path.parent, capture_output=True, text=True)
    fails_file = dom_path.with_suffix(".dom.fails")
    lines = [ln.strip() for ln in fails_file.read_text().splitlines()
             if ln.strip()] if fails_file.exists() else []
    hard = sum(1 for ln in lines if classify_fail_tier(ln) == "hard")
    score_file = dom_path.with_suffix(".dom.score")
    val = float(score_file.read_text().strip()) if score_file.exists() else float("nan")
    return len(lines), hard, len(lines) - hard, val


def record_and_push(row: dict) -> None:
    rows = []
    if RESULTS.exists():
        rows = list(csv.DictReader(RESULTS.open(), delimiter="\t"))
    rows.append({k: str(row[k]) for k in FIELDS})
    RESULTS.parent.mkdir(parents=True, exist_ok=True)
    with RESULTS.open("w", newline="") as fh:
        w = csv.DictWriter(fh, fieldnames=FIELDS, delimiter="\t")
        w.writeheader()
        w.writerows(rows)

    msg = (f"coldstart {row['programme']} seed {row['seed']} @ {row['budget']}: "
           f"{row['fails']} fails ({row['hard']}h/{row['soft']}s)")
    with git_lock():
        subprocess.run(["git", "add", "-A"], cwd=REPO, capture_output=True)
        subprocess.run(
            ["git", "commit", "-q", "-m", msg + "\n\n"
             "Cold-start re-baseline after the DESIGN.md 38.10/38.11 objective\n"
             "change. Single worker (avoids homemaker-py-b8g), scored by the\n"
             "shipped scorer from the programme directory.\n\n"
             "Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>\n"
             "Claude-Session: https://claude.ai/code/session_01MJ84Feep79Hhm3E4zZJmnB"],
            cwd=REPO, capture_output=True)
        for attempt in range(4):
            subprocess.run(["git", "pull", "--rebase", "-q", "origin",
                            "claude/beads-project-intro-fjiez3"],
                           cwd=REPO, capture_output=True)
            p = subprocess.run(["git", "push", "-q", "origin",
                                "claude/beads-project-intro-fjiez3"],
                               cwd=REPO, capture_output=True)
            if p.returncode == 0:
                break
            time.sleep(2 ** (attempt + 1))
    print(f"    pushed: {msg}", flush=True)


def main() -> None:
    ap = argparse.ArgumentParser(description=__doc__,
                                 formatter_class=argparse.RawDescriptionHelpFormatter)
    ap.add_argument("--budget", type=int, default=500000)
    ap.add_argument("--seeds", type=int, default=3)
    ap.add_argument("--slots", type=int, default=4)
    ap.add_argument("--programmes", nargs="+", default=PROGRAMMES)
    ap.add_argument("--dry-run", action="store_true")
    args = ap.parse_args()

    # seed-major: all programmes at seed 0, then seed 1, ...
    queue = [(p, s) for s in range(args.seeds) for p in args.programmes]
    print(f"{len(queue)} runs, budget {args.budget}, {args.slots} slots, "
          f"seed-major order\n", flush=True)
    if args.dry_run:
        for p, s in queue:
            print(f"  would run {p} seed {s}")
        return

    running: dict = {}
    while queue or running:
        while queue and len(running) < args.slots:
            prog, seed = queue.pop(0)
            d = REPO / "examples" / prog
            out = d / f"coldstart-{args.budget}-s{seed}.dom"
            log = d / f"coldstart-{args.budget}-s{seed}.log"
            fh = log.open("w")
            proc = subprocess.Popen(
                ["homemaker-evolve", "init.dom", "--budget", str(args.budget),
                 "--seed", str(seed), "--workers", "1", "--output", str(out)],
                cwd=d, stdout=subprocess.DEVNULL, stderr=fh)
            running[proc.pid] = (proc, prog, seed, out, fh, time.time())
            print(f"  start {prog} seed {seed} -> {out.name}", flush=True)

        time.sleep(10)
        for pid, (proc, prog, seed, out, fh, t0) in list(running.items()):
            if proc.poll() is None:
                continue
            fh.close()
            del running[pid]
            elapsed = round(time.time() - t0, 1)
            if not out.exists():
                print(f"    FAILED {prog} seed {seed} (rc={proc.returncode}, "
                      f"{elapsed}s) -- see the .log", flush=True)
                continue
            n, hard, soft, val = score(out)
            print(f"    done {prog} seed {seed}: {n} fails "
                  f"({hard}h/{soft}s) score {val:.4g} in {elapsed}s", flush=True)
            record_and_push(dict(programme=prog, seed=seed, budget=args.budget,
                                 fails=n, hard=hard, soft=soft, score=f"{val:.6g}",
                                 elapsed_s=elapsed, dom=out.name))

    print("\n=== all runs complete ===", flush=True)


if __name__ == "__main__":
    main()