OpenBLAS.NET

OpenBLAS.NET is a CSharp binding of OpenBLAS library: https://www.openblas.net/

In scientific computing, OpenBLAS is an open source implementation of the BLAS (Basic Linear Algebra Subprograms) API with many hand-crafted optimizations for specific processor types. It is developed at the Lab of Parallel Software and Computational Science, ISCAS.

Documentation: https://deepakkumar1984.github.io/OpenBLAS.NET/

Nuget

Install from nuget: https://www.nuget.org/packages/OpenBLAS.NET

Install-Package OpenBLAS.NET

dotnet add package OpenBLAS.NET

Example Dot Operation

static Array Dot(float[,] a, float[,] b, float alpha, float beta)
{
    unsafe
    {
        int m = 2;
        int k = 3;
        int n = 2;
        int lda = 2;
        int ldb = 3;
        int ldc = 2;
        float[,] c = new float[m, n];

        sbyte nta = (sbyte)BlasOp.NonTranspose;
        
        BLAS.Sgemm(&nta, &nta, ref m, ref n, ref k, ref alpha, ref a[0, 0], ref lda, ref b[0, 0], ref ldb, ref beta, ref c[0, 0], ref ldc);

        return c;
    }
    
}

Invoke the function:

static void Main(string[] args)
{
    int num_threads = 2;

    BLAS.OpenblasSetNumThreads(ref num_threads);

    float[,] a = new float[,] { { 1, 2 }, { 3, 4 }, { 5, 6 } };
    float[,] b = new float[,] { { 2, 2, 2}, { 3, 3, 3 } };
    var c = Dot(a, b, 1, 0);

    Console.ReadLine();
}