public static IntPtr CreateProblem(DataInstances data)
{
problem prob = new problem();
prob.l = data.Instances.Count;
prob.n = data.FeatureCount;
prob.y = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double)) * data.Instances.Count);
Marshal.Copy(data.Labels.ToArray(),0,prob.y,data.Labels.Count);
prob.x = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(IntPtr)) * data.Instances.Count);
IntPtr i_ptr_x = prob.x;
for (int i = 0; i < data.Instances.Count; i++)
{
IntPtr inst = CreateFeatureNode(data.Instances[i]);
Marshal.StructureToPtr(inst, i_ptr_x, true);
i_ptr_x = IntPtr.Add(i_ptr_x, Marshal.SizeOf(typeof(IntPtr)));
}
prob.bias = -1.0d;
int size = Marshal.SizeOf(prob);
IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(prob, ptr, true);
return ptr;
}
public static void FreeProblem(problem x)
{
Marshal.FreeHGlobal(x.y);
x.y = IntPtr.Zero;
IntPtr i_ptr_x = x.x;
for (int i = 0; i < x.l; i++)
{
IntPtr ptr_nodes = (IntPtr)Marshal.PtrToStructure(i_ptr_x, typeof(IntPtr));
FreeNode(ptr_nodes);
i_ptr_x = IntPtr.Add(i_ptr_x, Marshal.SizeOf(typeof(IntPtr)));
}
Marshal.FreeHGlobal(x.x);
x.x = IntPtr.Zero;
}