private float[] GetFloatInfo(string field)
{
ulong lenULong;
IntPtr result;
int output = XGBoostNative.XGDMatrixGetFloatInfo(_handle, field, out lenULong, out result);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
int len = unchecked ((int)lenULong);
float[] floatInfo = new float[len];
for (int i = 0; i < len; i++)
{
byte[] floatBytes = new byte[4];
floatBytes[0] = Marshal.ReadByte(result, 4 * i + 0);
floatBytes[1] = Marshal.ReadByte(result, 4 * i + 1);
floatBytes[2] = Marshal.ReadByte(result, 4 * i + 2);
floatBytes[3] = Marshal.ReadByte(result, 4 * i + 3);
float f = BitConverter.ToSingle(floatBytes, 0);
floatInfo[i] = f;
}
return(floatInfo);
}
public void Update(DMatrix train, int iter)
{
var output = XGBoostNative.XGBoosterUpdateOneIter(Handle, iter, train.Handle);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
}
public void LoadModelFromBuffer(byte[] buf)
{
int output = XGBoostNative.XGBoosterLoadModelFromBuffer(handle, buf, buf.Length);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
}
public void SetParameter(string name, string val)
{
int output = XGBoostNative.XGBoosterSetParam(handle, name, val);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
}
private void SetFloatInfo(string field, float[] floatInfo)
{
ulong len = (ulong)floatInfo.Length;
int output = XGBoostNative.XGDMatrixSetFloatInfo(_handle, field, floatInfo, len);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
}
public XGBooster(DMatrix train)
{
var dmats = new[] { train.Handle };
var len = unchecked ((ulong)dmats.Length);
var output = XGBoostNative.XGBoosterCreate(dmats, len, out handle);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
}
public XGBooster()
{
IntPtr tempPtr;
var output = XGBoostNative.XGBoosterCreate(null, 0, out tempPtr);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
handle = tempPtr;
}
public XGBooster(string fileName, int silent = 1)
{
IntPtr tempPtr;
var newBooster = XGBoostNative.XGBoosterCreate(null, 0, out tempPtr);
var output = XGBoostNative.XGBoosterLoadModel(tempPtr, fileName);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
handle = tempPtr;
}
public XGBooster(IDictionary <string, object> parameters, DMatrix train)
{
var dmats = new[] { train.Handle };
var len = unchecked ((ulong)dmats.Length);
var output = XGBoostNative.XGBoosterCreate(dmats, len, out handle);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
SetParameters(parameters);
}
public float[] Predict(DMatrix test, bool predContribs = false, int ntreeLimit = 0)
{
ulong predsLen;
IntPtr predsPtr;
int optionsMask = predContribs ? ContribsOptionMask : NormalOptionMask;
var output = XGBoostNative.XGBoosterPredict(
handle, test.Handle, optionsMask, ntreeLimit, out predsLen, out predsPtr);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
return(GetPredictionsArray(predsPtr, predsLen));
}
public byte[] GetModelRaw()
{
int length;
IntPtr dumpPtr;
int output = XGBoostNative.XGBoosterGetModelRaw(handle, out length, out dumpPtr);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
byte[] modelBytes = new byte[length];
Marshal.Copy(dumpPtr, modelBytes, 0, length);
return(modelBytes);
}
// Dispose pattern from MSDN documentation
protected virtual void Dispose(bool disposing)
{
if (disposed)
{
return;
}
int output = XGBoostNative.XGDMatrixFree(_handle);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
disposed = true;
}
public DMatrix(float[][] data, float[] labels = null)
{
float[] data1D = Flatten2DArray(data);
ulong nrows = unchecked ((ulong)data.Length);
ulong ncols = unchecked ((ulong)data[0].Length);
int output = XGBoostNative.XGDMatrixCreateFromMat(data1D, nrows, ncols, Missing, out _handle);
if (output == -1)
{
throw new DllFailException(XGBoostNative.XGBGetLastError());
}
if (labels != null)
{
Label = labels;
}
}