RegressionTreeBase.LeftChild Property
Definition
Important
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LeftChild[i] is the i-th node's child index used when
(1) the numerical feature indexed by NumericalSplitFeatureIndexes[i] is less than or equal
to the threshold NumericalSplitThresholds[i], or
(2) the categorical features indexed by GetCategoricalCategoricalSplitFeatureRangeAt(Int32)'s
returned value with nodeIndex=i is NOT a sub-set of GetCategoricalSplitFeaturesAt(Int32) with
nodeIndex=i.
Note that the case (1) happens only when CategoricalSplitFlags[i] is false and otherwise (2)
occurs. A non-negative returned value means a node (i.e., not a leaf); for example, 2 means the 3rd node in
the underlying Microsoft.ML.Trainers.FastTree.RegressionTreeBase._tree. A negative returned value means a leaf; for example, -1 stands for the
~(-1)-th leaf in the underlying Microsoft.ML.Trainers.FastTree.RegressionTreeBase._tree. Note that ~ is the
bitwise complement operator in C#; for details, see
https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/bitwise-complement-operator.
public System.Collections.Generic.IReadOnlyList<int> LeftChild { get; }member this.LeftChild : System.Collections.Generic.IReadOnlyList<int>Public ReadOnly Property LeftChild As IReadOnlyList(Of Integer)