lightgbm3 — Rust bindings for LightGBM

lightgbm3 is based on lightgbm crate (which is unsupported by now), but it is not back-compatible with it.

Installation

cargo add lightgbm3

Since lightgbm3 compiles LightGBM from source, you also need to install development libraries:

for Linux:

apt install -y cmake clang libclang-dev libc++-dev gcc-multilib

for Mac:

brew install cmake
brew install libomp # only required if you compile with "openmp" feature

for Windows

1. Install CMake and VS Build Tools.
2. Install LLVM and set LIBCLANG_PATH environment variable (i.e. C:\Program Files\LLVM\bin)

Please see below for details.

• LightGBM Installation-Guide

Usage

Training:

use lightgbm3::{Dataset, Booster};
use serde_json::json;

let features = vec![vec![1.0, 0.1, 0.2],
                    vec![0.7, 0.4, 0.5],
                    vec![0.9, 0.8, 0.5],
                    vec![0.2, 0.2, 0.8],
                    vec![0.1, 0.7, 1.0]];
let labels = vec![0.0, 0.0, 0.0, 1.0, 1.0];
let dataset = Dataset::from_vec_of_vec(features, labels, true).unwrap();
let params = json!{
   {
        "num_iterations": 10,
        "objective": "binary",
        "metric": "auc",
    }
};
let bst = Booster::train(dataset, &params).unwrap();
bst.save_file("path/to/model.lgb").unwrap();

Inference:

use lightgbm3::{Dataset, Booster};

let bst = Booster::from_file("path/to/model.lgb").unwrap();
let features = vec![1.0, 2.0, -5.0];
let n_features = features.len();
let y_pred = bst.predict_with_params(&features, n_features as i32, true, "num_threads=1").unwrap()[0];

Look in the ./examples/ folder for more details:

• binary classification
• multiclass classification
• regression

Features

lightgbm3 supports the following features:

• polars for polars support
• openmp for multi-processing support
• gpu for GPU support
• cuda for CUDA support

Benchmarks

cargo bench

Add --features=openmp, --features=gpu and --features=cuda appropriately.

Development

git clone --recursive https://github.com/Mottl/lightgbm3-rs.git

Thanks

Great respect to vaaaaanquish for the LightGBM Rust package, which unfortunately no longer supported.

Much reference was made to implementation and documentation. Thanks.

• microsoft/LightGBM
• davechallis/rust-xgboost