#k-means #clustering #cluster #means

nightly kmeans_smid

Small and fast library for k-means clustering calculations. Fixing smid from kmeans-rs.

3 unstable releases

0.3.0 Jun 13, 2024
0.2.3 Jun 13, 2024
0.2.2 Jun 13, 2024

#1292 in Algorithms

46 downloads per month

Apache-2.0

91KB
1.5K SLoC

kmeans_smid

Current Crates.io Version docs

kmeans_smid is a small and fast library for k-means clustering calculations. It fixes smid problem from kmeans crate. Here is a small example, using kmean++ as initialization method and lloyd as k-means variant:

use kmeans_smid::*;

fn main() {
    let (sample_cnt, sample_dims, k, max_iter) = (20000, 200, 4, 100);

    // Generate some random data
    let mut samples = vec![0.0f64;sample_cnt * sample_dims];
    samples.iter_mut().for_each(|v| *v = rand::random());

    // Calculate kmeans, using kmean++ as initialization-method
    let kmean = KMeans<f64, 8>::new(samples, sample_cnt, sample_dims);
    let result = kmean.kmeans_lloyd(k, max_iter, KMeans::init_kmeanplusplus, &KMeansConfig::default());

    println!("Centroids: {:?}", result.centroids);
    println!("Cluster-Assignments: {:?}", result.assignments);
    println!("Error: {}", result.distsum);
}

Datastructures

For performance-reasons, all calculations are done on bare vectors, using hand-written SIMD intrinsics from the packed_simd crate. All vectors are stored row-major, so each sample is stored in a consecutive block of memory.

Supported variants / algorithms

  • lloyd (standard kmeans)
  • minibatch

Supported centroid initialization methods

  • KMean++
  • random partition
  • random sample

Dependencies

~2MB
~40K SLoC