public void GetPathIds(ref VBuffer <float> dst)
                {
                    EnsureCachedPosition();
                    _ectx.Assert(_input.Position >= 0);
                    _ectx.Assert(_cachedPosition == _input.Position);

                    if (_cachedPathBuilderPosition != _input.Position)
                    {
                        if (_pathIdBuilder == null)
                        {
                            _pathIdBuilder = BufferBuilder <float> .CreateDefault();
                        }

                        var trees = ((ITreeEnsemble)_ensemble).GetTrees();
                        _pathIdBuilder.Reset(_numLeaves - _numTrees, dense: false);
                        var offset = 0;
                        for (int i = 0; i < _numTrees; i++)
                        {
                            var numNodes = trees[i].NumLeaves - 1;
                            var nodes    = _pathIds[i];
                            _ectx.AssertValue(nodes);
                            for (int j = 0; j < nodes.Count; j++)
                            {
                                var node = nodes[j];
                                _ectx.Assert(0 <= node && node < numNodes);
                                _pathIdBuilder.AddFeature(offset + node, 1);
                            }
                            offset += numNodes;
                        }

                        _cachedPathBuilderPosition = _input.Position;
                    }
                    _ectx.AssertValue(_pathIdBuilder);
                    _pathIdBuilder.GetResult(ref dst);
                }
                public void GetLeafIds(ref VBuffer <float> dst)
                {
                    EnsureCachedPosition();

                    _ectx.Assert(_input.Position >= 0);
                    _ectx.Assert(_cachedPosition == _input.Position);

                    if (_cachedLeafBuilderPosition != _input.Position)
                    {
                        if (_leafIdBuilder == null)
                        {
                            _leafIdBuilder = BufferBuilder <float> .CreateDefault();
                        }

                        _leafIdBuilder.Reset(_numLeaves, false);
                        var offset = 0;
                        var trees  = ((ITreeEnsemble)_ensemble).GetTrees();
                        for (int i = 0; i < trees.Length; i++)
                        {
                            _leafIdBuilder.AddFeature(offset + _leafIds[i], 1);
                            offset += trees[i].NumLeaves;
                        }

                        _cachedLeafBuilderPosition = _input.Position;
                    }
                    _ectx.AssertValue(_leafIdBuilder);
                    _leafIdBuilder.GetResult(ref dst);
                }