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smartKNN - A feature-weighted KNN algorithm with automatic preprocessing, normalization, and learned feature importance.

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<h1 align="center">SmartKNN</h1>

<p align="center">
A modern, weighted nearest-neighbor learning algorithm with learned feature importance and adaptive neighbor search.
</p>

## Overview

**SmartKNN** is a nearest-neighbor–based learning method that belongs to the
broader **KNN family** of algorithms.

It is designed to address common limitations observed in classical KNN
approaches, including:

- uniform treatment of all features  
- sensitivity to noisy or weakly informative dimensions  
- limited scalability as dataset size grows

SmartKNN incorporates **data-driven feature importance estimation**,
**dimension suppression**, and **adaptive neighbor search strategies**.
Depending on dataset characteristics, it can operate using either a
brute-force search or an approximate nearest-neighbor (ANN) backend, while
exposing a consistent, **scikit-learn–compatible API**.

The method supports both **regression** and **classification** tasks and
prioritizes **robustness**, **predictive accuracy**, and **practical inference latency**
across a range of dataset sizes.

---

## Key Capabilities

- **Learned feature weighting**
  - MSE relevance
  - Mutual Information
  - Random Forest importance  
  *(method configurable depending on task and dataset)*
- **Automatic preprocessing**
  - normalization
  - NaN / Inf handling
  - feature masking
- **Distance-weighted neighbor voting**
- **Brute-force and ANN backends**
  - designed to scale to large datasets (hardware and tuning dependent)
  - optional GPU-accelerated neighbor search
- **Vectorized NumPy with Numba acceleration**
- **Scikit-learn–compatible API**

---

## Installation

```bash
pip install smart-knn
```

---

## Documentation

- https://thatipamula-jashwanth.github.io/SmartEco/

Detailed documentation and design notes are maintained externally.
This repository README is intentionally kept concise.

---
## Examples

Runnable examples are available in the **examples/ directory**:
```
python examples/regression_example.py
python examples/classification_example.py
```

---
## Benchmarks & CI

- Comprehensive benchmark suites for regression and classification
- GitHub Actions CI for tests and benchmarks
- Reproducible, engineering-focused evaluation

Benchmark details are documented in **benchmarks/README.md**.

---
## Project Status

- SmartKNN v2 is stable
- API is frozen for the v2.x series (backward-compatible improvements only)
- Actively maintained
- Open to research and engineering collaboration

---
## License

**SmartKNN** is released under the **MIT License**.
See **LICENSE** for details.

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