oxicuda-backend

Part of the OxiCUDA ecosystem — Pure Rust CUDA replacement for the COOLJAPAN ecosystem.

Overview

oxicuda-backend defines the ComputeBackend trait — a unified, object-safe abstraction over GPU compute APIs (CUDA, ROCm, Metal, Level Zero). Higher-level crates such as SciRS2, ToRSh, and oxionnx program against this trait rather than any specific GPU API, enabling transparent backend switching at runtime without recompilation.

Features

• Object-safe ComputeBackend trait usable as Box<dyn ComputeBackend> or &dyn ComputeBackend
• General matrix multiply (gemm), 2D convolution (conv2d_forward), and scaled dot-product attention
• Element-wise unary and binary operations (ReLU, sigmoid, tanh, exp, log, sqrt, abs, neg; add, sub, mul, div, max, min)
• Reduction operations along any axis (sum, max, min, mean)
• Device memory management: alloc, free, copy_htod, copy_dtoh, synchronize
• Rich error type (BackendError) covering unsupported ops, device errors, OOM, and uninitialized state
• Zero external dependencies — built entirely on std

Usage

Add to your Cargo.toml:

[dependencies]
oxicuda-backend = "0.1.4"

use oxicuda_backend::{ComputeBackend, BackendTranspose, BackendResult};

fn run_gemm(backend: &dyn ComputeBackend) -> BackendResult<()> {
    let a = backend.alloc(64 * 8)?;   // 64×8 f64 matrix
    let b = backend.alloc(8 * 32)?;   // 8×32 f64 matrix
    let c = backend.alloc(64 * 32)?;  // output 64×32

    backend.gemm(
        BackendTranspose::NoTrans, BackendTranspose::NoTrans,
        64, 32, 8,
        1.0, a, 64, b, 8, 0.0, c, 64,
    )?;
    backend.synchronize()?;
    backend.free(a)?;
    backend.free(b)?;
    backend.free(c)?;
    Ok(())
}

Status

• Version: 0.1.4 (2026-04-18)
• Tests: 10 passing

License

Apache-2.0 — © 2026 COOLJAPAN OU (Team KitaSan)