com.eignex.kumulant/stat/regression/tree/RegressionTerminalLeaf

RegressionTerminalLeaf

class RegressionTerminalLeaf<Row>(val arm: SeriesStat<WeightedVarianceResult>) : RegressionLeafNode<Row> (source)

Frozen leaf; no further splits will be considered.

Constructors

RegressionTerminalLeaf

constructor(arm: SeriesStat<WeightedVarianceResult>)(source)

Properties

arm

open override val arm: SeriesStat<WeightedVarianceResult>(source)

The leaf's weighted-variance accumulator.

Functions

aggregate

fun RegressionNode<*>.aggregate(): WeightedVarianceResult

Public per-node subtree aggregate over all observations routed through this node (leaves: the arm snapshot; splits: the exact Chan-merge of both children plus any RegressionSplitNode.carryover). Lets callers score internal nodes — e.g. a Thompson walk-down that picks a branch by its subtree's posterior — without the tree having to keep a live arm on every split node. Equivalent to a directly-accumulated internal arm: Chan's parallel merge is exact for weighted-variance aggregates.

findLeaf

override fun findLeaf(row: Row): RegressionLeafNode<Row>

Walk to the leaf this row resolves to.

snapshot

fun RegressionNode<VectorView>.snapshot(): TreeNodeResult

Freeze a live VectorView tree node into an immutable, serializable snapshot. Internal split aggregates are derived from the snapshotted children so the wire format stays stable even though live splits hold no arm.