CHANGELOG_FIXES.md

Changelog: Immediate and Short-term Fixes

Summary

This document tracks the immediate and short-term fixes implemented based on the repository analysis.

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Immediate Fixes (Completed)

1. ✅ Comprehensive Logging Added (src/edgeeda/cli.py)

Changes:

• Added _setup_logging() function to configure logging to both file and console
• Log file created at {out_dir}/tuning.log
• Added detailed logging throughout the tuning loop:
  • Experiment start/configuration
  • Each action proposal (variant, fidelity, knobs)
  • Make command execution results
  • Metadata extraction attempts
  • Reward computation results
  • Summary statistics at completion

Benefits:

• Full visibility into tuning process
• Easy debugging of failures
• Historical record of experiments

2. ✅ SurrogateUCBAgent Knob Storage Fixed (src/edgeeda/agents/surrogate_ucb.py)

Changes:

• Initialize _variant_knobs dictionary in __init__() instead of lazy initialization
• Removed hasattr() checks - always use self._variant_knobs
• Ensures knob values are always available for promotion logic

Benefits:

• Prevents AttributeError when promoting variants
• More reliable multi-fidelity optimization
• Cleaner code without hasattr checks

3. ✅ Configuration Validation Added (src/edgeeda/config.py)

Changes:

• Added _validate_config() function with comprehensive checks:
  • Budget validation (total_actions > 0, max_expensive >= 0, max_expensive <= total_actions)
  • Fidelities validation (non-empty)
  • Knobs validation (non-empty, min < max, valid types)
  • Reward weights validation (non-empty)
  • Reward candidates validation (at least one list non-empty)

Benefits:

• Catches configuration errors early
• Clear error messages for invalid configs
• Prevents runtime failures from bad configs

4. ✅ Improved Error Messages (src/edgeeda/orfs/runner.py)

Changes:

• Added RunResult.is_success() method
• Added RunResult.error_summary() method that:
  • Extracts error lines from stderr
  • Falls back to last few lines if no error keywords found
  • Provides concise error information

Benefits:

• Better error visibility
• Easier debugging of failed make commands
• Structured error information

5. ✅ Robust Metadata Extraction (src/edgeeda/orfs/metrics.py)

Changes:

• Added logging throughout metadata search process
• Improved find_best_metadata_json() with:
  • Multiple pattern matching (exact matches first, then patterns)
  • Better error handling for missing directories
  • Debug logging for search process
• Enhanced load_json() with:
  • Specific exception handling
  • Error logging for different failure modes

Benefits:

• More reliable metadata discovery
  • Tries exact matches: metadata.json, metrics.json
  • Then pattern matches: *metadata*.json, *metrics*.json
  • Falls back to any JSON file
• Better debugging when metadata is missing
• Clear error messages for JSON parsing failures

6. ✅ Retry Logic for Transient Failures (src/edgeeda/orfs/runner.py)

Changes:

• Added max_retries parameter to run_make() method
• Implements exponential backoff (2^attempt seconds)
• Handles:
  • Subprocess failures (retries on non-zero return codes)
  • Timeout exceptions
  • General exceptions during execution

Benefits:

• Handles transient network/filesystem issues
• Reduces false failures from temporary problems
• Configurable retry behavior

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Short-term Fixes (Completed)

7. ✅ Unit Tests for Agents (tests/test_agents.py)

New Test File:

• test_random_search_proposes() - Validates random search action proposals
• test_random_search_observe() - Tests observe method
• test_successive_halving_initialization() - Tests SH agent setup
• test_successive_halving_propose() - Tests action proposals
• test_successive_halving_promotion() - Tests multi-fidelity promotion
• test_surrogate_ucb_initialization() - Tests SurrogateUCB setup
• test_surrogate_ucb_propose() - Tests action proposals
• test_surrogate_ucb_observe() - Tests observation storage
• test_surrogate_ucb_knob_storage() - Tests knob storage for promotion
• test_surrogate_ucb_surrogate_fitting() - Tests surrogate model fitting
• test_agent_action_consistency() - Tests all agents produce valid actions

Coverage:

• All three agent types
• Key agent behaviors (propose, observe, promotion)
• Edge cases and error handling

8. ✅ Unit Tests for Metrics (tests/test_metrics.py)

New Test File:

• test_flatten_metrics_*() - Tests metric flattening (simple, complex, empty, leaf values)
• test_coerce_float_*() - Tests float coercion (int, float, string, invalid)
• test_pick_first_*() - Tests metric key selection (found, not found, case-insensitive, multiple candidates)
• test_load_json_*() - Tests JSON loading (valid, invalid, missing)

Coverage:

• All metrics utility functions
• Edge cases and error conditions
• Type coercion and matching logic

9. ✅ Updated Dependencies (requirements.txt)

Changes:

• Added pytest>=7.0 for running unit tests

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Testing

To run the new tests:

# Install pytest if not already installed
pip install pytest

# Run all tests
pytest tests/ -v

# Run specific test file
pytest tests/test_agents.py -v
pytest tests/test_metrics.py -v

# Run with coverage
pytest tests/ --cov=edgeeda --cov-report=html

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Usage Examples

Using Logging

Logs are automatically created when running edgeeda tune:

edgeeda tune --config configs/gcd_nangate45.yaml --budget 24
# Logs written to: runs/tuning.log

Using Retry Logic

Retry logic is available but defaults to 0 retries. To enable:

# In cli.py, modify run_make calls:
rr = runner.run_make(
    target=make_target,
    design_config=cfg.design.design_config,
    flow_variant=action.variant,
    overrides={k: str(v) for k, v in action.knobs.items()},
    timeout_sec=args.timeout,
    max_retries=2,  # Add this parameter
)

Configuration Validation

Invalid configurations now fail early with clear messages:

# This will raise ValueError:
cfg = load_config("invalid_config.yaml")
# ValueError: total_actions must be > 0, got -5

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Files Modified

1. src/edgeeda/cli.py - Added logging throughout
2. src/edgeeda/agents/surrogate_ucb.py - Fixed knob storage
3. src/edgeeda/config.py - Added validation
4. src/edgeeda/orfs/runner.py - Improved error messages, added retry logic
5. src/edgeeda/orfs/metrics.py - Enhanced metadata extraction with logging
6. requirements.txt - Added pytest
7. tests/test_agents.py - New test file
8. tests/test_metrics.py - New test file

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Next Steps

Recommended Follow-ups:

1. Run Tests: Install pytest and verify all tests pass
2. Test Logging: Run a small experiment and verify logs are created
3. Test Retry Logic: Manually test retry behavior with transient failures
4. Validate Config: Try invalid configs to see validation in action

Future Enhancements:

• Add integration tests with mock ORFS runner
• Add performance benchmarks
• Add more visualization options
• Implement parallel execution
• Add resume from checkpoint functionality

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Notes

• All changes maintain backward compatibility
• No breaking changes to existing APIs
• Logging can be disabled by setting log level to WARNING or ERROR
• Retry logic defaults to 0 (no retries) to maintain current behavior
• Tests require pytest but don't affect runtime dependencies