arcweight 0.3.0

A high-performance, modular library for weighted finite state transducers with comprehensive examples and benchmarks
Documentation 
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use arcweight::prelude::*;
use criterion::{criterion_group, criterion_main, Criterion};
use std::hint::black_box;

fn create_linear_fst(n: usize) -> VectorFst<TropicalWeight> {
    let mut fst = VectorFst::new();
    let mut states = Vec::new();

    for _ in 0..=n {
        states.push(fst.add_state());
    }

    fst.set_start(states[0]);
    fst.set_final(states[n], TropicalWeight::one());

    for i in 0..n {
        fst.add_arc(
            states[i],
            Arc::new(
                (i + 1) as u32,
                (i + 1) as u32,
                TropicalWeight::new(1.0),
                states[i + 1],
            ),
        );
    }

    fst
}

fn create_branching_fst(n: usize) -> VectorFst<TropicalWeight> {
    let mut fst = VectorFst::new();
    let mut states = Vec::new();

    for _ in 0..=n {
        states.push(fst.add_state());
    }

    fst.set_start(states[0]);
    fst.set_final(states[n], TropicalWeight::one());

    for i in 0..n {
        // Add multiple arcs from each state
        for j in 1..=3 {
            fst.add_arc(
                states[i],
                Arc::new(
                    j as u32,
                    j as u32,
                    TropicalWeight::new(j as f32),
                    states[i + 1],
                ),
            );
        }
    }

    fst
}

fn bench_fst_creation(c: &mut Criterion) {
    let mut group = c.benchmark_group("fst_creation");

    group.bench_function("linear_100", |b| {
        b.iter(|| create_linear_fst(black_box(100)))
    });

    group.bench_function("linear_1000", |b| {
        b.iter(|| create_linear_fst(black_box(1000)))
    });

    group.bench_function("branching_100", |b| {
        b.iter(|| create_branching_fst(black_box(100)))
    });

    group.finish();
}

fn bench_shortest_path(c: &mut Criterion) {
    let mut group = c.benchmark_group("shortest_path");

    let linear_fst = create_linear_fst(1000);
    let branching_fst = create_branching_fst(100);

    group.bench_function("linear_1000", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> =
                shortest_path_single(black_box(&linear_fst)).unwrap();
            black_box(result);
        })
    });

    group.bench_function("branching_100", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> =
                shortest_path_single(black_box(&branching_fst)).unwrap();
            black_box(result);
        })
    });

    group.finish();
}

fn bench_compose(c: &mut Criterion) {
    let mut group = c.benchmark_group("compose");

    let fst1 = create_linear_fst(100);
    let fst2 = create_linear_fst(100);
    let fst3 = create_branching_fst(50);

    group.bench_function("linear_100x100", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> =
                compose_default(black_box(&fst1), black_box(&fst2)).unwrap();
            black_box(result);
        })
    });

    group.bench_function("linear_branching_100x50", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> =
                compose_default(black_box(&fst1), black_box(&fst3)).unwrap();
            black_box(result);
        })
    });

    group.finish();
}

fn bench_determinize(c: &mut Criterion) {
    let mut group = c.benchmark_group("determinize");

    let linear_fst = create_linear_fst(100);
    let branching_fst = create_branching_fst(50);

    group.bench_function("linear_100", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> = determinize(black_box(&linear_fst)).unwrap();
            black_box(result);
        })
    });

    group.bench_function("branching_50", |b| {
        b.iter(|| {
            let result: VectorFst<TropicalWeight> = determinize(black_box(&branching_fst)).unwrap();
            black_box(result);
        })
    });

    group.finish();
}

criterion_group!(
    benches,
    bench_fst_creation,
    bench_shortest_path,
    bench_compose,
    bench_determinize
);
criterion_main!(benches);