Atomizer/docs/protocols/operations/OP_02_RUN_OPTIMIZATION.md

OP_02: Run Optimization

Overview

This protocol covers executing optimization runs, including pre-flight validation, execution modes, monitoring, and handling common issues.

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When to Use

Trigger	Action
"start", "run", "execute"	Follow this protocol
"begin optimization"	Follow this protocol
Study setup complete	Execute this protocol

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Quick Reference

Start Command:

conda activate atomizer
cd studies/{study_name}
python run_optimization.py

Common Options:

Flag	Purpose
--n-trials 100	Override trial count
--resume	Continue interrupted run
--test	Run single trial for validation
--export-training	Export data for neural training

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Pre-Flight Checklist

Before running, verify:

• Environment: conda activate atomizer
• Config exists: 1_setup/optimization_config.json
• Script exists: run_optimization.py
• Model files: NX files in 1_setup/model/
• No conflicts: No other optimization running on same study
• Disk space: Sufficient for results

Quick Validation:

python run_optimization.py --test

This runs a single trial to verify setup.

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Execution Modes

1. Standard Run

python run_optimization.py

Uses settings from optimization_config.json.

2. Override Trials

python run_optimization.py --n-trials 100

Override trial count from config.

3. Resume Interrupted

python run_optimization.py --resume

Continues from last completed trial.

4. Neural Acceleration

python run_optimization.py --neural

Requires trained surrogate model.

5. Export Training Data

python run_optimization.py --export-training

Saves BDF/OP2 for neural network training.

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Monitoring Progress

Option 1: Console Output

The script prints progress:

Trial 15/50 complete. Best: 0.234 kg
Trial 16/50 complete. Best: 0.234 kg

Option 2: Dashboard

See SYS_13_DASHBOARD_TRACKING.

# Start dashboard (separate terminal)
cd atomizer-dashboard/backend && python -m uvicorn api.main:app --port 8000
cd atomizer-dashboard/frontend && npm run dev

# Open browser
http://localhost:3000

Option 3: Query Database

python -c "
import optuna
study = optuna.load_study('study_name', 'sqlite:///2_results/study.db')
print(f'Trials: {len(study.trials)}')
print(f'Best value: {study.best_value}')
"

Option 4: Optuna Dashboard

optuna-dashboard sqlite:///2_results/study.db
# Open http://localhost:8080

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During Execution

What Happens Per Trial

1. Sample parameters: Optuna suggests design variable values
2. Update model: NX expressions updated via journal
3. Solve: NX Nastran runs FEA simulation
4. Extract results: Extractors read OP2 file
5. Evaluate: Check constraints, compute objectives
6. Record: Trial stored in Optuna database

Normal Output

[2025-12-05 10:15:30] Trial 1 started
[2025-12-05 10:17:45] NX solve complete (135.2s)
[2025-12-05 10:17:46] Extraction complete
[2025-12-05 10:17:46] Trial 1 complete: mass=0.342 kg, stress=198.5 MPa

[2025-12-05 10:17:47] Trial 2 started
...

Expected Timing

Operation	Typical Time
NX solve	30s - 30min
Extraction	<1s
Per trial total	1-30 min
50 trials	1-24 hours

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Handling Issues

Trial Failed / Pruned

[WARNING] Trial 12 pruned: Stress constraint violated (312.5 MPa > 250 MPa)

Normal behavior - optimizer learns from failures.

NX Session Timeout

[ERROR] NX session timeout after 600s

Solution: Increase timeout in config or simplify model.

Expression Not Found

[ERROR] Expression 'thicknes' not found in model

Solution: Check spelling, verify expression exists in NX.

OP2 File Missing

[ERROR] OP2 file not found: model.op2

Solution: Check NX solve completed. Review NX log file.

Database Locked

[ERROR] Database is locked

Solution: Another process using database. Wait or kill stale process.

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Stopping and Resuming

Graceful Stop

Press Ctrl+C once. Current trial completes, then exits.

Force Stop

Press Ctrl+C twice. Immediate exit (may lose current trial).

Resume

python run_optimization.py --resume

Continues from last completed trial. Same study database used.

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Post-Run Actions

After optimization completes:

1. Check results:

   python -c "import optuna; s=optuna.load_study(...); print(s.best_params)"
   

2. View in dashboard: http://localhost:3000

3. Generate report: See OP_04_ANALYZE_RESULTS

4. Update STUDY_REPORT.md: Fill in results template

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Protocol Integration

With Protocol 10 (IMSO)

If enabled, optimization runs in two phases:

1. Characterization (10-30 trials)
2. Optimization (remaining trials)

Dashboard shows phase transitions.

With Protocol 11 (Multi-Objective)

If 2+ objectives, uses NSGA-II. Returns Pareto front, not single best.

With Protocol 13 (Dashboard)

Writes optimizer_state.json every trial for real-time updates.

With Protocol 14 (Neural)

If --neural flag, uses trained surrogate for fast evaluation.

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Troubleshooting

Symptom	Cause	Solution
"ModuleNotFoundError"	Wrong environment	conda activate atomizer
All trials pruned	Constraints too tight	Relax constraints
Very slow	Model too complex	Simplify mesh, increase timeout
No improvement	Wrong sampler	Try different algorithm
"NX license error"	License unavailable	Check NX license server

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Cross-References

• Preceded By: OP_01_CREATE_STUDY
• Followed By: OP_03_MONITOR_PROGRESS, OP_04_ANALYZE_RESULTS
• Integrates With: SYS_10_IMSO, SYS_13_DASHBOARD_TRACKING

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Version History

Version	Date	Changes
1.0	2025-12-05	Initial release