public void SpeedTest()
        {
            int inchannels = 1024, outchannels = 512;

            OverflowCheckedTensor x_tensor = new OverflowCheckedTensor(Shape.Map0D(inchannels));
            OverflowCheckedTensor w_tensor = new OverflowCheckedTensor(Shape.Kernel0D(inchannels, outchannels));

            OverflowCheckedTensor y_tensor = new OverflowCheckedTensor(Shape.Map0D(outchannels));

            Dense ope = new Dense(inchannels, outchannels);

            Stopwatch sw = new Stopwatch();

            sw.Start();

            ope.Execute(x_tensor, w_tensor, y_tensor);
            ope.Execute(x_tensor, w_tensor, y_tensor);
            ope.Execute(x_tensor, w_tensor, y_tensor);
            ope.Execute(x_tensor, w_tensor, y_tensor);

            sw.Stop();

            Console.WriteLine($"{sw.ElapsedMilliseconds / 4} msec");
        }
        public void ExecuteTest()
        {
            float max_err = 0;

            foreach (int batch in new int[] { 1, 2 })
            {
                foreach (int inchannels in new int[] { 1, 2, 3, 4, 5, 10, 15, 20 })
                {
                    foreach (int outchannels in new int[] { 7, 13 })
                    {
                        float[] xval = (new float[inchannels * batch]).Select((_, idx) => idx * 1e-3f).ToArray();
                        float[] wval = (new float[inchannels * outchannels]).Select((_, idx) => idx * 1e-3f).Reverse().ToArray();

                        Map0D    x = new Map0D(inchannels, batch, xval);
                        Filter0D w = new Filter0D(inchannels, outchannels, 1, wval);

                        Map0D y = Reference(x, w);

                        OverflowCheckedTensor x_tensor = new OverflowCheckedTensor(Shape.Map0D(inchannels, batch), xval);
                        OverflowCheckedTensor w_tensor = new OverflowCheckedTensor(Shape.Kernel0D(inchannels, outchannels), wval);

                        OverflowCheckedTensor y_tensor = new OverflowCheckedTensor(Shape.Map0D(outchannels, batch));

                        Dense ope = new Dense(inchannels, outchannels, batch);

                        ope.Execute(x_tensor, w_tensor, y_tensor);

                        float[] y_expect = y.ToArray();
                        float[] y_actual = y_tensor.State;

                        CollectionAssert.AreEqual(xval, x_tensor.State);
                        CollectionAssert.AreEqual(wval, w_tensor.State);

                        AssertError.Tolerance(y_expect, y_actual, 1e-7f, 1e-5f, ref max_err, $"mismatch value {inchannels},{outchannels},{batch}");

                        Console.WriteLine($"pass: {inchannels},{outchannels},{batch}");
                    }
                }
            }

            Console.WriteLine($"maxerr:{max_err}");
        }