pls check this excption. about numpy.net HOT 5 CLOSED

using (Py.GIL())
{
    np.matmul(a, b);
}

Console.WriteLine("Efficient matrix multiplication with NumPy:");
// before starting the measurement, let us call numpy once to get the setup checks done. 
var stopwatch = Stopwatch.StartNew();
np.arange(1);

var a1 = np.arange(60000).reshape(300, 200);
var a2 = np.arange(80000).reshape(200, 400);

var result = np.matmul(a1, a2);
stopwatch.Stop();

Console.WriteLine($"execution time with NumPy: {stopwatch.Elapsed.TotalMilliseconds}ms\n");
Console.WriteLine("Result:\n" + result.repr);


Console.WriteLine("executing on bg thread");

var a = np.arange(1000);
var b = np.arange(1000);

// https://github.com/pythonnet/pythonnet/issues/109
PythonEngine.BeginAllowThreads();

Task.Run(() =>
{
    using (Py.GIL())
    {
        np.matmul(a, b);
        Console.WriteLine("matmul on bg thread is done");
    }
}).Wait();
Console.WriteLine("Press key");

Console.ReadKey();