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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace Microsoft.Research.MachineLearning
{
public sealed class VowpalWabbitInterface
{
public class FeatureSpace
{
public string Name;
public Feature[] Features;
}
public class Feature
{
public float X;
public UInt32 WeightIndex;
}
[StructLayout(LayoutKind.Sequential)]
public struct FEATURE_SPACE
{
public byte name;
public IntPtr features;
public int len;
}
[StructLayout(LayoutKind.Sequential)]
public struct FEATURE
{
public float x;
public uint weight_index;
}
[DllImport("libvw.dll", EntryPoint="VW_Initialize", CallingConvention=CallingConvention.StdCall)]
public static extern IntPtr Initialize(string arguments);
[DllImport("libvw.dll", EntryPoint="VW_Finish", CallingConvention=CallingConvention.StdCall)]
public static extern void Finish(IntPtr vw);
[DllImport("libvw.dll", EntryPoint = "VW_ImportExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr ImportExample(IntPtr vw,
[In, MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 2)]
FEATURE_SPACE[] features,
int length);
[DllImport("libvw.dll", EntryPoint="VW_ReadExample", CallingConvention=CallingConvention.StdCall)]
public static extern IntPtr ReadExample(IntPtr vw, string exampleString);
[DllImport("libvw.dll", EntryPoint="VW_FinishExample", CallingConvention=CallingConvention.StdCall)]
public static extern void FinishExample(IntPtr vw, IntPtr example);
[DllImport("libvw.dll", EntryPoint = "VW_HashSpace", CallingConvention = CallingConvention.StdCall)]
public static extern uint HashSpace(IntPtr vw, string s);
[DllImport("libvw.dll", EntryPoint = "VW_HashFeature", CallingConvention = CallingConvention.StdCall)]
public static extern uint HashFeature(IntPtr vw, string s, ulong u);
[DllImport("libvw.dll", EntryPoint="VW_Learn", CallingConvention=CallingConvention.StdCall)]
public static extern float Learn(IntPtr vw, IntPtr example);
}
}
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