Function dot_product

src/test/test_kernelmatrix.cpp:8–24

float_type dot_product(const DataSet::node2d &instances, int x, int y) {
    float_type sum = 0;
    auto i = instances[x].begin();
    auto j = instances[y].begin();
    while (i != instances[x].end() && j != instances[y].end()) {
        if (i->index < j->index) {
            i++;
        } else if (i->index > j->index) {
            j++;
        } else {
            sum += i->value * j->value;
            i++;
            j++;
        }
    }
    return sum;
}

kernel_type get_cpu_kernel(const DataSet::node2d &instances, int x, int y, const SvmParam &param) {
    kernel_type r;