Function test_copy_tensor_slice_gpu

dlib/test/dnn.cpp:3101–3167

        }
    }
    void test_copy_tensor_slice_gpu()
    {
        using namespace dlib::tt;
        print_spinner();
        resizable_tensor dest(10, 9, 7, 15);
        resizable_tensor src1(10, 3, 7, 15);
        resizable_tensor src2(10, 3, 6, 12);
        resizable_tensor src3(10, 9, 7, 15);
        tt::tensor_rand rnd;
        rnd.fill_gaussian(dest);
        rnd.fill_gaussian(src1);
        rnd.fill_gaussian(src2);
        rnd.fill_gaussian(src3);

        const resizable_tensor old_dest = dest;

        cuda::copy_tensor(false, dest, 0, 0, 0, src1, 0, 0, 0, src1.k(), src1.nr(), src1.nc()); //full copy src1->dest
        cuda::copy_tensor(false, dest, src1.k(), 0, 0, src2, 0, 0, 0, src2.k(), src2.nr(), src2.nc()); //full copy src2->dest with offset of src1
        cuda::copy_tensor(false, dest, src1.k() + src2.k(), 1, 1, src3, 3, 1, 1, 3, src3.nr()-2, src3.nc()-2); //partial copy src3 into the rest place of dest


        for (long i = 0; i < dest.num_samples(); ++i)
        {
            for (long k = 0; k < dest.k(); ++k)
            {
                for (long r = 0; r < dest.nr(); ++r)
                {
                    for (long c = 0; c < dest.nc(); ++c)
                    {
                        float old_dest_value = tensor_read_cpu(old_dest, i, k, r, c);
                        float dest_value = tensor_read_cpu(dest, i, k, r, c);
                        // first part is from src1
                        if (k < src1.k())
                        {
                            float src_value = tensor_read_cpu(src1, i, k, r, c);
                            DLIB_TEST(src_value == dest_value);
                        }
                        // second part is from src2
                        else if (k < src1.k() + src2.k())
                        {
                            if (r < src2.nr() && c < src2.nc())
                            {
                                float src_value = tensor_read_cpu(src2, i, k - src1.k(), r, c);
                                DLIB_TEST(src_value == dest_value);
                            }
                            else
                            {
                                DLIB_TEST(old_dest_value == dest_value);
                            }
                        }
                        // third part is from src3
                        else
                        {
                            if (r > 0 && c > 0 && r + 1 < src3.nr() && c + 1 < src3.nc())
                            {
                                float src_value = tensor_read_cpu(src3, i, k - src1.k() - src2.k() + 3, r, c);
                                DLIB_TEST(src_value == dest_value);
                            }