# How to Extend an Optimization Study

**Date**: November 20, 2025

When you want to run more iterations to get better results, you have three options:

---

## Option 1: Continue Existing Study (Recommended)

**Best for**: When you want to keep all previous trial data and just add more iterations

**Advantages**:
- Preserves all existing trials
- Continues from current best result
- Uses accumulated knowledge from previous trials
- More efficient (no wasted trials)

**Process**:

### Step 1: Wait for current optimization to finish
Check if the v2.1 test is still running:
```bash
# On Windows
tasklist | findstr python

# Check background job status
# Look for the running optimization process
```

### Step 2: Run the continuation script
```bash
cd studies/circular_plate_protocol10_v2_1_test
python continue_optimization.py
```

### Step 3: Configure number of additional trials
Edit [continue_optimization.py:29](../studies/circular_plate_protocol10_v2_1_test/continue_optimization.py#L29):
```python
# CONFIGURE THIS: Number of additional trials to run
ADDITIONAL_TRIALS = 50  # Change to 100 for total of ~150 trials
```

**Example**: If you ran 50 trials initially and want 100 total:
- Set `ADDITIONAL_TRIALS = 50`
- Study will run trials #50-99 (continuing from where it left off)
- All 100 trials will be in the same study database

---

## Option 2: Modify Config and Restart

**Best for**: When you want a completely fresh start with more iterations

**Advantages**:
- Clean slate optimization
- Good for testing different configurations
- Simpler to understand (one continuous run)

**Disadvantages**:
- Loses all previous trial data
- Wastes computational budget if previous trials were good

**Process**:

### Step 1: Stop any running optimization
```bash
# Kill the running process if needed
# On Windows, find the PID and:
taskkill /PID <process_id> /F
```

### Step 2: Edit optimization config
Edit [studies/circular_plate_protocol10_v2_1_test/1_setup/optimization_config.json](../studies/circular_plate_protocol10_v2_1_test/1_setup/optimization_config.json):
```json
{
  "trials": {
    "n_trials": 100,  // Changed from 50 to 100
    "timeout_per_trial": 3600
  }
}
```

### Step 3: Delete old results
```bash
cd studies/circular_plate_protocol10_v2_1_test

# Delete old database and history
del 2_results\study.db
del 2_results\optimization_history_incremental.json
del 2_results\intelligent_optimizer\*.*
```

### Step 4: Rerun optimization
```bash
python run_optimization.py
```

---

## Option 3: Wait and Evaluate First

**Best for**: When you're not sure if more iterations are needed

**Process**:

### Step 1: Wait for current test to finish
The v2.1 test is currently running with 50 trials. Let it complete first.

### Step 2: Check results
```bash
cd studies/circular_plate_protocol10_v2_1_test

# View optimization report
type 3_reports\OPTIMIZATION_REPORT.md

# Or check test summary
type 2_results\test_summary.json
```

### Step 3: Evaluate performance
Look at:
- **Best error**: Is it < 0.1 Hz? (target achieved)
- **Convergence**: Has it plateaued or still improving?
- **Pruning rate**: < 5% is good

### Step 4: Decide next action
- **If target achieved**: Done! No need for more trials
- **If converging**: Add 20-30 more trials (Option 1)
- **If struggling**: May need algorithm adjustment, not more trials

---

## Comparison Table

| Feature | Option 1: Continue | Option 2: Restart | Option 3: Wait |
|---------|-------------------|-------------------|----------------|
| Preserves data | ✅ Yes | ❌ No | ✅ Yes |
| Efficient | ✅ Very | ❌ Wasteful | ✅ Most |
| Easy to set up | ✅ Simple | ⚠️ Moderate | ✅ Simplest |
| Best use case | Adding more trials | Testing new config | Evaluating first |

---

## Detailed Example: Extending to 100 Trials

Let's say the v2.1 test (50 trials) finishes with:
- Best error: 0.25 Hz (not at target yet)
- Convergence: Still improving
- Pruning rate: 4% (good)

**Recommendation**: Continue with 50 more trials (Option 1)

### Step-by-step:

1. **Check current status**:
   ```python
   import optuna
   storage = "sqlite:///studies/circular_plate_protocol10_v2_1_test/2_results/study.db"
   study = optuna.load_study(study_name="circular_plate_protocol10_v2_1_test", storage=storage)

   print(f"Current trials: {len(study.trials)}")
   print(f"Best error: {study.best_value:.4f} Hz")
   ```

2. **Edit continuation script**:
   ```python
   # In continue_optimization.py line 29
   ADDITIONAL_TRIALS = 50  # Will reach ~100 total
   ```

3. **Run continuation**:
   ```bash
   cd studies/circular_plate_protocol10_v2_1_test
   python continue_optimization.py
   ```

4. **Monitor progress**:
   - Watch console output for trial results
   - Check `optimization_history_incremental.json` for updates
   - Look for convergence (error decreasing)

5. **Verify results**:
   ```python
   # After completion
   study = optuna.load_study(...)
   print(f"Total trials: {len(study.trials)}")  # Should be ~100
   print(f"Final best error: {study.best_value:.4f} Hz")
   ```

---

## Understanding Trial Counts

**Important**: The "total trials" count includes both successful and pruned trials.

Example breakdown:
```
Total trials: 50
├── Successful: 47 (94%)
│   └── Used for optimization
└── Pruned: 3 (6%)
    └── Rejected (invalid parameters, simulation failures)
```

When you add 50 more trials:
```
Total trials: 100
├── Successful: ~94 (94%)
└── Pruned: ~6 (6%)
```

The optimization algorithm only learns from **successful trials**, so:
- 50 successful trials ≈ 53 total trials (with 6% pruning)
- 100 successful trials ≈ 106 total trials (with 6% pruning)

---

## Best Practices

### When to Add More Trials:
✅ Error still decreasing (not converged yet)
✅ Close to target but need refinement
✅ Exploring new parameter regions

### When NOT to Add More Trials:
❌ Error has plateaued for 20+ trials
❌ Already achieved target tolerance
❌ High pruning rate (>10%) - fix validation instead
❌ Wrong algorithm selected - fix strategy selector instead

### How Many to Add:
- **Close to target** (within 2x tolerance): Add 20-30 trials
- **Moderate distance** (2-5x tolerance): Add 50 trials
- **Far from target** (>5x tolerance): Investigate root cause first

---

## Monitoring Long Runs

For runs with 100+ trials (several hours):

### Option A: Run in background (Windows)
```bash
# Start minimized
start /MIN python continue_optimization.py
```

### Option B: Use screen/tmux (if available)
```bash
# Not standard on Windows, but useful on Linux/Mac
tmux new -s optimization
python continue_optimization.py
# Detach: Ctrl+B, then D
# Reattach: tmux attach -t optimization
```

### Option C: Monitor progress file
```python
# Check progress without interrupting
import json
with open('2_results/optimization_history_incremental.json') as f:
    history = json.load(f)

print(f"Completed trials: {len(history)}")
best = min(history, key=lambda x: x['objective'])
print(f"Current best: {best['objective']:.4f} Hz")
```

---

## Troubleshooting

### Issue: "Study not found in database"
**Cause**: Initial optimization hasn't run yet or database corrupted
**Fix**: Run `run_optimization.py` first to create the initial study

### Issue: Continuation starts from trial #0
**Cause**: Study database exists but is empty
**Fix**: Delete database and run fresh optimization

### Issue: NX session conflicts
**Cause**: Multiple NX sessions accessing same model
**Solution**: NX Session Manager handles this automatically, but verify:
```python
from optimization_engine.nx_session_manager import NXSessionManager
mgr = NXSessionManager()
print(mgr.get_status_report())
```

### Issue: High pruning rate in continuation
**Cause**: Optimization exploring extreme parameter regions
**Fix**: Simulation validator should prevent this, but verify rules are active

---

**Summary**: For your case (wanting 100 iterations), use **Option 1** with the `continue_optimization.py` script. Set `ADDITIONAL_TRIALS = 50` and run it after the current test finishes.