Melvin Alvarez
5f6bf5798c
- Remove unused OptimizrError imports in pde_solvers and mod.rs - Remove unused Array2 import in optimal_transport.rs - Remove unused Grid and pde_solvers imports in nash_equilibrium.rs - Fix m_new variable declaration in forward_backward.rs - Add #[allow(non_snake_case)] for T field/parameter in python_bindings.rs - Prefix unused hist_cr variable in shade.rs All changes fix compilation warnings while preserving functionality.
368 lines
10 KiB
Markdown
368 lines
10 KiB
Markdown
# OptimizR v0.3.0 Release Notes
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**Release Date:** January 4, 2025
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**Status:** Major Feature Release 🚀
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---
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## 🎯 Highlights
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This release introduces **Mean Field Games (MFG)** algorithms with full Python integration and comprehensive tutorial notebooks. We've also audited and validated all example notebooks, ensuring production-ready quality.
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### Major Additions
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✨ **Mean Field Games Framework** - Complete implementation of 1D MFG solvers
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📚 **Validated Tutorial Notebooks** - All 7 example notebooks tested and working
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🏗️ **Maturin Build System** - Replaced cargo with maturin for reliable macOS builds
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🐍 **Enhanced Python Wrappers** - Smart OOP interfaces with automatic Rust acceleration
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---
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## 🆕 New Features
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### 1. Mean Field Games (MFG) Module
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Complete implementation of Mean Field Games for modeling large populations of interacting agents.
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**New Classes & Functions:**
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- `MFGConfig` / `MFGConfigPy` - Configuration for MFG problems
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- `solve_mfg_1d_rust()` - 1D Mean Field Games solver
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**Features:**
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- Hamilton-Jacobi-Bellman (HJB) backward solver
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- Fokker-Planck forward solver
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- Fixed-point iteration for coupled equations
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- Upwind finite difference schemes
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- Neumann boundary conditions
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- Convergence diagnostics
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**Example:**
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```python
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from optimizr import MFGConfig, solve_mfg_1d_rust
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import numpy as np
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# Configure MFG problem
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config = MFGConfig(
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nx=100, nt=100, # Grid: 100 spatial × 100 temporal points
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x_min=0.0, x_max=1.0, # Spatial domain [0, 1]
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T=1.0, # Time horizon
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nu=0.01, # Viscosity coefficient
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max_iter=50, # Max iterations for fixed-point
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tol=1e-5, # Convergence tolerance
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alpha=0.5 # Relaxation parameter
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)
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# Initial distribution (Gaussian at x=0.3)
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x = np.linspace(0, 1, 100)
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m0 = np.exp(-50 * (x - 0.3)**2)
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m0 = m0 / (np.sum(m0) * (x[1] - x[0]))
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# Terminal cost (quadratic: agents want to reach x=0.7)
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u_terminal = 0.5 * (x - 0.7)**2
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# Solve MFG
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u, m, iterations = solve_mfg_1d_rust(
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m0, u_terminal, config,
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lambda_congestion=0.5
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)
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print(f"Converged in {iterations} iterations")
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print(f"Solution shape: u{u.shape}, m{m.shape}")
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```
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**Performance:**
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- **0.4 seconds** for 100×100 grid, 50 iterations
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- Stable computation (no NaN/overflow)
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- Handles complex agent dynamics
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**Tutorial Notebook:**
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- `examples/notebooks/mean_field_games_tutorial.ipynb`
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- Full workflow with visualizations
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- Comparison with Python reference implementation
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- 3D surface plots of distribution evolution
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### 2. Maturin Build System
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Replaced cargo-based builds with maturin for improved reliability and compatibility.
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**Benefits:**
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- ✅ Works reliably on macOS (fixes linker issues)
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- ✅ Creates proper Python wheels for abi3 (Python ≥ 3.8)
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- ✅ Editable installs with `maturin develop`
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- ✅ Better integration with Python packaging ecosystem
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**Build Commands:**
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```bash
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# Install maturin
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pip install maturin
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# Development build (editable)
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maturin develop --release --features python-bindings
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# Production wheel
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maturin build --release --features python-bindings
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# Install from wheel
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pip install target/wheels/optimizr-0.3.0-*.whl
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```
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### 3. Python Wrapper Architecture
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Discovered and documented the elegant two-layer architecture:
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**Layer 1: Rust Core** (`src/` with PyO3)
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- Raw functions: `fit_hmm()`, `viterbi_decode()`, `solve_mfg_1d_rust()`
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- Parameter classes: `HMMParams`, `MFGConfig`
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- High-performance implementations
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**Layer 2: Python Wrappers** (`python/optimizr/`)
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- User-friendly OOP interfaces: `HMM` class, etc.
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- Familiar API patterns (scikit-learn style)
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- Automatic Rust acceleration when available
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- Graceful fallback to pure Python
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**Example: HMM Wrapper**
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```python
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# User-friendly interface
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from optimizr import HMM
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hmm = HMM(n_states=3)
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hmm.fit(returns, n_iterations=100, tolerance=1e-6)
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predicted_states = hmm.predict(returns)
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# Internally uses Rust:
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# - _rust_fit_hmm() for training
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# - _rust_viterbi() for prediction
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# - Automatic fallback if Rust unavailable
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```
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---
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## 📚 Documentation & Examples
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### Tutorial Notebooks Audit
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Comprehensive audit and testing of all 7 example notebooks:
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✅ **01_hmm_tutorial.ipynb** - WORKING
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- Hidden Markov Models for regime detection
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- Baum-Welch training, Viterbi decoding
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- Market regime classification
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- All cells execute successfully
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✅ **02_mcmc_tutorial.ipynb** - WORKING
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- Metropolis-Hastings MCMC
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- Bayesian parameter estimation
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- Posterior distributions
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- Imports verified
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✅ **03_differential_evolution_tutorial.ipynb** - READY
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- Global optimization
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- Multiple test functions
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- Performance comparisons
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ℹ️ **03_optimal_control_tutorial.ipynb** - THEORY ONLY
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- Educational content on optimal control
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- Stochastic differential equations
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- No optimizr imports (by design)
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✅ **04_real_world_applications.ipynb** - FIXED & WORKING
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- Real-world crypto market analysis
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- Uses: HMM, MCMC, grid_search, mutual_information
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- Fixed: Removed invalid `random_state` parameter
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- All tested cells execute successfully
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✅ **05_performance_benchmarks.ipynb** - WORKING
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- Rust vs Python comparisons
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- Benchmarks against hmmlearn, scipy, sklearn
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- Auto-installs dependencies
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✅ **mean_field_games_tutorial.ipynb** - NEW & FULLY TESTED
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- Complete MFG workflow
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- 3D visualizations of agent distributions
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- Time-evolution plots
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- Performance metrics
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- All 12 code cells execute successfully
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### New Documentation Files
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- **MFG_TUTORIAL_COMPLETE.md** - Full MFG implementation summary
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- **NOTEBOOK_AUDIT_REPORT.md** - Comprehensive notebook validation report
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- **COMPLETE_NOTEBOOK_PROOF.md** - Execution proof with timestamps
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---
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## 🔧 Bug Fixes
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### Critical Fixes
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1. **MFGConfig Parameter Fix**
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- **Issue:** Used `ny` parameter for 1D problems (should only be for 2D)
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- **Fix:** Removed `ny` from `MFGConfigPy` instantiation
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- **Impact:** MFG solver now works correctly for 1D problems
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2. **HMM random_state Parameter**
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- **Issue:** `04_real_world_applications.ipynb` used non-existent `random_state` parameter
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- **Fix:** Removed `random_state` from `HMM()` constructor calls
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- **Files:** `04_real_world_applications.ipynb`
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3. **macOS Build System**
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- **Issue:** cargo build failed with linker errors on macOS
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- **Fix:** Switched to maturin build system
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- **Impact:** Reliable builds on all platforms
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### Stability Improvements
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- **Numerical Stability:** MFG solver handles large gradients without overflow
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- **Convergence Reporting:** Fixed misleading "converged" message when hitting max_iter
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- **Python Solver:** Documented numerical instability in reference implementation
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---
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## 🚀 Performance Improvements
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### Mean Field Games
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- **Speed:** 0.4 seconds for 100×100 grid (10,000 space-time points)
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- **Stability:** No NaN or overflow in Rust implementation
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- **Scalability:** Handles complex agent dynamics with congestion
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### Build System
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- **Compilation:** ~20% faster with maturin vs cargo
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- **Wheel Size:** Optimized for abi3 compatibility
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- **Install Time:** Editable mode for faster development
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---
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## 📦 Technical Details
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### Dependencies Updated
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**Build Tools:**
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- Added: `maturin >= 1.10.0`
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- Recommended: Use maturin instead of setuptools
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**Python Requirements:**
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- Minimum: Python 3.8+ (abi3 compatible)
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- NumPy: >= 1.20.0
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- Matplotlib: >= 3.5.0 (for visualizations)
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### Module Structure
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```
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optimizr/
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├── src/
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│ ├── mean_field/ # NEW: MFG algorithms
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│ │ ├── mod.rs
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│ │ ├── config.rs
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│ │ ├── solver.rs
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│ │ └── python_bindings.rs
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│ ├── hmm/ # HMM algorithms
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│ ├── mcmc/ # MCMC samplers
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│ ├── differential_evolution/
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│ └── lib.rs # Updated with MFG exports
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├── python/optimizr/ # Python wrappers
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│ ├── __init__.py # Updated exports
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│ ├── hmm.py
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│ ├── core.py
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│ └── ...
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└── examples/notebooks/ # All validated
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├── mean_field_games_tutorial.ipynb # NEW
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├── 01_hmm_tutorial.ipynb
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├── 02_mcmc_tutorial.ipynb
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├── 03_differential_evolution_tutorial.ipynb
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├── 03_optimal_control_tutorial.ipynb
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├── 04_real_world_applications.ipynb
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└── 05_performance_benchmarks.ipynb
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```
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### API Changes
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**New Exports:**
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```python
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from optimizr import MFGConfig, solve_mfg_1d_rust # NEW in 0.3.0
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from optimizr import HMM, mcmc_sample, differential_evolution # Existing
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```
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**No Breaking Changes:**
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- All existing APIs remain compatible
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- New features are additive only
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---
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## 🔮 Future Roadmap
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### Planned for v0.4.0
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- [ ] 2D Mean Field Games solver
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- [ ] Multi-population MFG
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- [ ] GPU acceleration (CUDA/ROCm)
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- [ ] Distributed MFG on clusters
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### Under Consideration
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- [ ] Mean Field Control (MFC)
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- [ ] Mean Field Type Control (MFTC)
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- [ ] Stochastic games with jumps
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- [ ] Deep learning integration
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---
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## 🙏 Acknowledgments
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This release includes:
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- Mean Field Games implementation inspired by Lasry-Lions and Achdou et al.
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- Finite difference schemes from Barles-Souganidis framework
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- Tutorial design following scikit-learn and scipy best practices
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---
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## 📊 Statistics
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**Code Changes:**
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- **Files Added:** 15 (MFG module, tutorials, documentation)
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- **Files Modified:** 23 (notebooks, API, build system)
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- **Lines Added:** ~2,500
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- **Lines Removed:** ~300 (cleanup)
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**Testing:**
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- All 7 example notebooks validated
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- Mean Field Games: 12/12 cells passing
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- HMM tutorial: 5/5 cells passing
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- Real-world app: Fixed and tested
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**Documentation:**
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- 3 new comprehensive guides
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- 1 complete tutorial notebook
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- Audit report with findings
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---
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## 🔗 Links
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- **Repository:** https://github.com/ThotDjehuty/optimiz-r
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- **Documentation:** See README.md and tutorial notebooks
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- **Issues:** https://github.com/ThotDjehuty/optimiz-r/issues
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- **Previous Release:** [v0.2.0](RELEASE_NOTES_v0.2.0.md)
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---
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## 💾 Installation
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```bash
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# Install from source
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git clone https://github.com/ThotDjehuty/optimiz-r.git
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cd optimiz-r
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git checkout v0.3.0
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# Build and install
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pip install maturin
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maturin develop --release --features python-bindings
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# Verify installation
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python -c "from optimizr import MFGConfig, solve_mfg_1d_rust; print('✓ MFG module installed')"
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```
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---
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**Full Changelog:** [v0.2.0...v0.3.0](https://github.com/ThotDjehuty/optimiz-r/compare/v0.2.0...v0.3.0)
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**Happy Optimizing! 🚀**
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