sci-run / tasks /surface-code-decoding /surface-code-decoding-astra-xhigh-1h100-48h-20261020b /submissions /S034 /training_code.py
| """Fit matching ensemble from random coefficients using the hardware training split.""" | |
| import os | |
| os.environ['OPENBLAS_NUM_THREADS'] = '1' | |
| os.environ['OMP_NUM_THREADS'] = '1' | |
| from concurrent.futures import ProcessPoolExecutor, as_completed | |
| from pathlib import Path | |
| import json, time, hashlib, shutil, importlib.metadata | |
| import numpy as np | |
| import stim | |
| from scipy.optimize import minimize | |
| from scipy.special import expit | |
| from decoder import match_features, predict_features | |
| ROOT = Path(__file__).resolve().parent | |
| DATA = Path('/workspace/data') | |
| def features(row): | |
| path = ROOT/'cache'/f"{row['name']}.npz" | |
| if path.exists(): | |
| return row['name'] | |
| dem = stim.DetectorErrorModel.from_file(DATA/'train'/row['noise']) | |
| content = {} | |
| for split in ('train', 'validation'): | |
| with np.load(DATA/split/row['arrays'], allow_pickle=False) as a: | |
| content[split+'_x'] = match_features(dem, a['detectors'], row['rounds']) | |
| content[split+'_y'] = a['labels'] | |
| np.savez(path, **content) | |
| return row['name'] | |
| def main(): | |
| start = time.time() | |
| rows = json.loads((DATA/'train/manifest.json').read_text())['conditions'] | |
| (ROOT/'cache').mkdir(exist_ok=True) | |
| with ProcessPoolExecutor(max_workers=16) as pool: | |
| futures = [pool.submit(features, row) for row in rows] | |
| for i, future in enumerate(as_completed(futures)): | |
| print(json.dumps({'features_done': i+1, 'condition': future.result(), 'seconds': time.time()-start}), flush=True) | |
| pkg = ROOT/'package' | |
| pkg.mkdir(exist_ok=True) | |
| (pkg/'weights').mkdir(exist_ok=True) | |
| (pkg/'dems').mkdir(exist_ok=True) | |
| config = {'architecture': 'per-group logistic ensemble of MWPM, correlated MWPM, and two constrained logical cosets', | |
| 'feature_version': 1, 'groups': {}, 'conditions': {}} | |
| history = [] | |
| for group in sorted({r['group'] for r in rows}): | |
| members = [r for r in rows if r['group'] == group] | |
| cache = [np.load(ROOT/'cache'/f"{r['name']}.npz") for r in members] | |
| x = np.concatenate([a['train_x'] for a in cache]).astype(np.float64) | |
| y = np.concatenate([a['train_y'] for a in cache]).astype(np.float64) | |
| vx = np.concatenate([a['validation_x'] for a in cache]).astype(np.float64) | |
| vy = np.concatenate([a['validation_y'] for a in cache]) | |
| scale = np.maximum(np.sqrt(np.mean(x*x, axis=0)), 0.01) | |
| x /= scale | |
| rng = np.random.default_rng(20261021) | |
| initial = rng.normal(0, 0.01, x.shape[1]) | |
| def objective(w): | |
| z = x @ w | |
| loss = np.mean(np.logaddexp(0, z)-y*z) + 1e-5*np.sum(w*w) | |
| grad = x.T @ (expit(z)-y)/len(y) + 2e-5*w | |
| return loss, grad | |
| fit = minimize(objective, initial, jac=True, method='L-BFGS-B', options={'maxiter': 300, 'ftol': 1e-12}) | |
| state = {'coef': fit.x.astype(np.float32), 'scale': scale.astype(np.float32)} | |
| p = predict_features(vx, state) | |
| metrics = {'group': group, 'train_loss': float(fit.fun), 'iterations': int(fit.nit), | |
| 'failure': float(np.mean((p>=.5)!=vy)), | |
| 'plain_failure': float(np.mean((vx[:,2]>0)!=vy)), | |
| 'correlated_failure': float(np.mean((vx[:,3]>0)!=vy)), | |
| 'coset_failure': float(np.mean((vx[:,1]>0)!=vy)), | |
| 'optimizer_success': bool(fit.success)} | |
| history.append(metrics) | |
| print(json.dumps(metrics), flush=True) | |
| np.savez(pkg/'weights'/f'{group}.npz', **state) | |
| config['groups'][group] = f'weights/{group}.npz' | |
| for row in rows: | |
| target = f"dems/{row['name']}.dem" | |
| shutil.copyfile(DATA/'train'/row['noise'], pkg/target) | |
| config['conditions'][row['name']] = {'dem': target, 'circuit_sha256': row['circuit_sha256']} | |
| shutil.copyfile(ROOT/'decoder.py', pkg/'decoder.py') | |
| shutil.copyfile(ROOT/'train.py', pkg/'training_code.py') | |
| (pkg/'infer.sh').write_text('#!/bin/sh\nset -eu\nexport OPENBLAS_NUM_THREADS=1 OMP_NUM_THREADS=1\nROOT="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"\nexec python "$ROOT/decoder.py" "$1" "$2"\n') | |
| (pkg/'infer.sh').chmod(0o755) | |
| (pkg/'README.md').write_text('# Learned matching ensemble\n\nRun `bash infer.sh INPUT_ROOT OUTPUT_ROOT`. Ten logistic specialists are trained from random initialization on all supplied hardware training shots. Features combine matching decisions, constrained logical-coset weight gaps, event density and duration. No IDs enter the model. Fitted DEMs are included for all 130 conditions. Training and validation history is in training_provenance.json.\n') | |
| deps = ['numpy', 'scipy', 'stim', 'pymatching'] | |
| (pkg/'requirements.lock').write_text('\n'.join(f'{d}=={importlib.metadata.version(d)}' for d in deps)+'\n') | |
| sha = lambda p: hashlib.sha256(p.read_bytes()).hexdigest() | |
| provenance = {'initialization': {'distribution': 'Normal(0,0.01)', 'seed': 20261021, 'pretrained_weights': False}, | |
| 'training_data': 'all 19880 supplied training shots per condition; all 130 conditions', | |
| 'train_manifest_sha256': sha(DATA/'train/manifest.json'), | |
| 'validation_manifest_sha256': sha(DATA/'validation/manifest.json'), | |
| 'calibration_exception': 'Supplied even-fitted DEMs include validation syndromes but no logical labels or test data.', | |
| 'optimizer': 'L-BFGS-B binary cross entropy plus 1e-5 L2, maximum 300 iterations', | |
| 'selection': 'First trained candidate; validation reported without parameter fitting or hyperparameter selection', | |
| 'test_data_used': False, 'released_per_shot_predictions_used': False, | |
| 'history': history, 'elapsed_seconds': time.time()-start} | |
| for name, obj in [('model_config.json', config), ('training_provenance.json', provenance)]: | |
| (pkg/name).write_text(json.dumps(obj, indent=2)+'\n') | |
| checkpoints = [{'path': str(p.relative_to(pkg)), 'sha256': sha(p), 'format': 'npz' if p.suffix=='.npz' else 'stim-dem'} | |
| for p in sorted((pkg/'weights').glob('*'))+sorted((pkg/'dems').glob('*'))] | |
| (pkg/'model_manifest.json').write_text(json.dumps({'schema': 'surface-code-decoding-model/v1', 'checkpoints': checkpoints, | |
| 'model_config': 'model_config.json', 'training_provenance': 'training_provenance.json'}, indent=2)+'\n') | |
| p = 1-np.mean([np.mean([h['failure'] for h in history if h['group'].startswith(d)]) for d in ['d3', 'd5']]) | |
| print(json.dumps({'P': p, 'package': str(pkg), 'seconds': time.time()-start}), flush=True) | |
| if __name__ == '__main__': | |
| main() | |