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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
{
[StructLayout(LayoutKind.Sequential)]
public struct FEATURE_SPACE
{
public byte name;
public IntPtr features; // points to a FEATURE[]
public int len;
}
[StructLayout(LayoutKind.Sequential)]
public struct FEATURE
{
public float x;
public uint weight_index;
}
[StructLayout(LayoutKind.Sequential)]
public struct LABEL
{
public float label;
public float weight;
public float initial;
}
[StructLayout(LayoutKind.Sequential)]
public struct FLAT_RAW_EXAMPLE
{
public IntPtr ld;
public float final_prediction;
public UInt64 tag_len;
public IntPtr tag;//An identifier for the example.
public UInt64 example_counter;
public UInt32 ft_offset;
public float global_weight;
public UInt64 num_features;//precomputed, cause it's fast&easy.
public UInt64 feature_map_len;
public IntPtr feature_map; //map to store sparse feature vectors
}
[StructLayout(LayoutKind.Sequential)]
public struct FLAT_EXAMPLE
{
public LABEL ld;
public float final_prediction;
public byte[] tag;//An identifier for the example.
public UInt64 example_counter;
public UInt32 ft_offset;
public float global_weight;
public UInt64 num_features;//precomputed, cause it's fast&easy.
public FEATURE[] feature_map; //map to store sparse feature vectors
}
[DllImport("libvw.dll", EntryPoint = "VW_Initialize", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr Initialize([MarshalAs(UnmanagedType.LPWStr)]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)]
// features points to a FEATURE_SPACE[]
public static extern IntPtr ImportExample(IntPtr vw, IntPtr features, int length);
[DllImport("libvw.dll", EntryPoint = "VW_ExportExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr ExportExample(IntPtr vw, IntPtr example, ref int length);
[DllImport("libvw.dll", EntryPoint = "VW_ReleaseFeatureSpace", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr ReleaseFeatureSpace(IntPtr fs, int length);
[DllImport("libvw.dll", EntryPoint = "VW_ReadExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr ReadExample(IntPtr vw, [MarshalAs(UnmanagedType.LPWStr)]string exampleString);
[DllImport("libvw.dll", EntryPoint = "VW_StartParser", CallingConvention = CallingConvention.StdCall)]
public static extern void StartParser(IntPtr vw, bool do_init);
[DllImport("libvw.dll", EntryPoint = "VW_EndParser", CallingConvention = CallingConvention.StdCall)]
public static extern void EndParser(IntPtr vw);
[DllImport("libvw.dll", EntryPoint = "VW_GetExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr GetExample(IntPtr parser);
[DllImport("libvw.dll", EntryPoint = "VW_GetLabel", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr GetLabel(IntPtr vw, IntPtr example);
[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, [MarshalAs(UnmanagedType.LPWStr)]string s);
[DllImport("libvw.dll", EntryPoint = "VW_HashFeature", CallingConvention = CallingConvention.StdCall)]
public static extern uint HashFeature(IntPtr vw, [MarshalAs(UnmanagedType.LPWStr)]string s, ulong u);
[DllImport("libvw.dll", EntryPoint = "VW_Learn", CallingConvention = CallingConvention.StdCall)]
public static extern float Learn(IntPtr vw, IntPtr example);
[DllImport("libvw.dll", EntryPoint = "VW_AddLabel", CallingConvention = CallingConvention.StdCall)]
public static extern void AddLabel(IntPtr example, float label=float.MaxValue, float weight=1, float initial=0);
[DllImport("libvw.dll", EntryPoint = "VW_Get_Weight", CallingConvention = CallingConvention.StdCall)]
public static extern float Get_Weight(IntPtr vw, UInt32 index, UInt32 offset);
[DllImport("libvw.dll", EntryPoint = "VW_Num_Weights", CallingConvention = CallingConvention.StdCall)]
public static extern UInt32 Num_Weights(IntPtr vw);
[DllImport("libvw.dll", EntryPoint = "VW_Get_Stride", CallingConvention = CallingConvention.StdCall)]
public static extern UInt32 Get_Stride(IntPtr vw);
[DllImport("libvw.dll", EntryPoint = "VW_FlattenExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr Flatten_Example(IntPtr vw, IntPtr example);
[DllImport("libvw.dll", EntryPoint = "VW_FreeFlattenExample", CallingConvention = CallingConvention.StdCall)]
public static extern IntPtr FreeFlattenExample(IntPtr fec);
}
}
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