ppforest2::TreeCondition Struct Reference

Internal split node in a projection pursuit tree. More...

#include <TreeCondition.hpp>

Public Types
using	Ptr = std::unique_ptr<TreeCondition>
Public Types inherited from ppforest2::TreeNode
using	Ptr = std::unique_ptr<TreeNode>

Public Member Functions
	TreeCondition (pp::Projector projector, Threshold threshold, TreeNode::Ptr lower, TreeNode::Ptr upper, std::set< types::Response > groups={}, types::Feature pp_index_value=0)
void	accept (TreeNode::Visitor &visitor) const override
	Accept a tree node visitor (double dispatch).
TreeNode::Ptr	clone () const override
	Deep copy of this node and its subtree.
bool	equals (TreeNode const &other) const override
	Structural equality comparison (value-based).
int	group_count () const override
	Number of distinct groups reachable from this node.
bool	is_leaf () const override
	Whether this node is a leaf (TreeResponse).
std::set< types::Response >	node_groups () const override
	Sorted set of group labels reachable from this node.
types::Response	predict (types::FeatureVector const &data) const override
	Route an observation through this split.
types::Response	response () const override
	Returns the response of the lower child.
Public Member Functions inherited from ppforest2::TreeNode
virtual	~TreeNode ()=default
bool	operator!= (TreeNode const &other) const
bool	operator== (TreeNode const &other) const

Static Public Member Functions
static Ptr	make (pp::Projector projector, Threshold threshold, TreeNode::Ptr lower, TreeNode::Ptr upper, std::set< types::Response > groups={}, types::Feature pp_index_value=0)
	Factory method that returns a unique_ptr to a new TreeCondition.

Public Attributes
std::set< types::Response >	groups
	Set of group labels reachable from this node.
TreeNode::Ptr	lower
	Child node for observations with projected value < threshold.
types::Feature	pp_index_value = 0
	Projection pursuit index value achieved at this split.
pp::Projector	projector
	Projection vector (p). Defines the linear combination of features.
Threshold	threshold
	Split threshold on the projected value.
TreeNode::Ptr	upper
	Child node for observations with projected value ≥ threshold.
Public Attributes inherited from ppforest2::TreeNode
bool	degenerate = false
	Whether this node (or any descendant) had a degenerate split.

Detailed Description

Internal split node in a projection pursuit tree.

Projects an observation onto projector and compares the result against threshold. If the projected value is below the threshold the observation goes to the lower child; otherwise to upper.

Member Typedef Documentation

Ptr

using ppforest2::TreeCondition::Ptr = std::unique_ptr<TreeCondition>

Constructor & Destructor Documentation

TreeCondition()

ppforest2::TreeCondition::TreeCondition	(	pp::Projector	projector,
		Threshold	threshold,
		TreeNode::Ptr	lower,
		TreeNode::Ptr	upper,
		std::set< types::Response >	groups = {},
		types::Feature	pp_index_value = 0 )

Member Function Documentation

accept()

void ppforest2::TreeCondition::accept ( TreeNode::Visitor & visitor ) const

overridevirtual

Accept a tree node visitor (double dispatch).

Implements ppforest2::TreeNode.

clone()

TreeNode::Ptr ppforest2::TreeCondition::clone ( ) const

overridevirtual

Deep copy of this node and its subtree.

Implements ppforest2::TreeNode.

equals()

bool ppforest2::TreeCondition::equals ( TreeNode const & other ) const

overridevirtual

Structural equality comparison (value-based).

Implements ppforest2::TreeNode.

group_count()

int ppforest2::TreeCondition::group_count ( ) const

inlineoverridevirtual

Number of distinct groups reachable from this node.

Implements ppforest2::TreeNode.

is_leaf()

bool ppforest2::TreeCondition::is_leaf ( ) const

inlineoverridevirtual

Whether this node is a leaf (TreeResponse).

Implements ppforest2::TreeNode.

make()

static Ptr ppforest2::TreeCondition::make ( pp::Projector projector, Threshold threshold, TreeNode::Ptr lower, TreeNode::Ptr upper, std::set< types::Response > groups = {}, types::Feature pp_index_value = 0 )

static

Factory method that returns a unique_ptr to a new TreeCondition.

node_groups()

std::set< types::Response > ppforest2::TreeCondition::node_groups ( ) const

inlineoverridevirtual

Sorted set of group labels reachable from this node.

Implements ppforest2::TreeNode.

predict()

types::Response ppforest2::TreeCondition::predict ( types::FeatureVector const & data ) const

overridevirtual

Route an observation through this split.

Projects data onto the projector, compares against the threshold, and delegates to the appropriate child node.

Parameters

data	Feature vector (p).

Returns

Predicted group label from the reached leaf.

Implements ppforest2::TreeNode.

response()

types::Response ppforest2::TreeCondition::response ( ) const

overridevirtual

Returns the response of the lower child.

Implements ppforest2::TreeNode.

Member Data Documentation

groups

std::set<types::Response> ppforest2::TreeCondition::groups

Set of group labels reachable from this node.

lower

TreeNode::Ptr ppforest2::TreeCondition::lower

Child node for observations with projected value < threshold.

pp_index_value

types::Feature ppforest2::TreeCondition::pp_index_value = 0

Projection pursuit index value achieved at this split.

projector

pp::Projector ppforest2::TreeCondition::projector

Projection vector (p). Defines the linear combination of features.

threshold

Threshold ppforest2::TreeCondition::threshold

Split threshold on the projected value.

upper

TreeNode::Ptr ppforest2::TreeCondition::upper

Child node for observations with projected value ≥ threshold.

---

The documentation for this struct was generated from the following file:

• core/src/models/TreeCondition.hpp