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);
}