public string[] DumpModelEx(string fmap, int with_stats, string format)
{
int length;
string[] dumpStr;
XGBOOST_NATIVE_METHODS.XGBoosterDumpModel(handle, fmap, with_stats, out length, out dumpStr);
return(dumpStr);
}
public string[] DumpModelEx(string fmap, int with_stats, string format)
{
int length;
IntPtr treePtr;
var intptrSize = IntPtr.Size;
XGBOOST_NATIVE_METHODS.XGBoosterDumpModel(handle, fmap, with_stats, out length, out treePtr);
var trees = new string[length];
int readSize = 0;
var handle2 = GCHandle.Alloc(treePtr, GCHandleType.Pinned);
//iterate through the length of the tree ensemble and pull the strings out from the returned pointer's array of pointers. prepend python's api convention of adding booster[i] to the beginning of the tree
for (var i = 0; i < length; i++)
{
var ipt1 = Marshal.ReadIntPtr(Marshal.ReadIntPtr(handle2.AddrOfPinnedObject()), intptrSize * i);
string s = Marshal.PtrToStringAnsi(ipt1);
trees[i] = string.Format("booster[{0}]\n{1}", i, s);
var bytesToRead = (s.Length * 2) + IntPtr.Size;
readSize += bytesToRead;
}
handle2.Free();
return(trees);
}