Package org.drip.graph.astar

Class DynamicWeightFHeuristic

java.lang.Object

org.drip.graph.astar.FHeuristic

org.drip.graph.astar.DynamicWeightFHeuristic

All Implemented Interfaces:

VertexFunction

public class DynamicWeightFHeuristic
extends FHeuristic

DynamicWeightFHeuristic implements the Dynamically Weighted A^* F-Heuristic Value at a Vertex. The References are:

• Dechter, R., and J. Pearl (1985): Generalized Best-first Search Strategies and the Optimality of A^* Journal of the ACM 32 (3) 505-536
• Hart, P. E., N. J. Nilsson, and B. Raphael (1968): A Formal Basis for the Heuristic Determination of the Minimum Cost Paths IEEE Transactions on Systems Sciences and Cybernetics 4 (2) 100-107
• Kagan, E., and I. Ben-Gal (2014): A Group Testing Algorithm with Online Informational Learning IIE Transactions 46 (2) 164-184
• Russell, S. J. and P. Norvig (2018): Artificial Intelligence: A Modern Approach 4^th Edition Pearson
• Wikipedia (2020): A^* Search Algorithm https://en.wikipedia.org/wiki/A*_search_algorithm

• Module = Computational Core Module
• Library = Graph Algorithm Library
• Project = Graph Optimization and Tree Construction Algorithms
• Package = A^* Heuristic Shortest Path Family

Author:

Lakshmi Krishnamurthy

Constructor Summary

Constructors

Constructor	Description
DynamicWeightFHeuristic(VertexFunction gHeuristic, VertexFunction hHeuristic, VertexFunction wHeuristic, double epsilon)	DynamicWeightFHeuristic Constructor

Method Summary

Modifier and Type	Method	Description
double	epsilon()	Retrieve the "Epsilon" Weight
double	evaluate(Vertex<?> vertex)	Compute the Value at the Vertex
static DynamicWeightFHeuristic	Pohl1970(VertexFunction gHeuristic, VertexFunction hHeuristic, VertexFunction depthFunction, double epsilon, double anticipatedSolutionLength)	Construct the Pohl (1970) Version of the DynamicWeightFHeuristic
VertexFunction	wHeuristic()	Retrieve the W Heuristic

Methods inherited from class org.drip.graph.astar.FHeuristic

gHeuristic, hHeuristic, isConsistent, isMonotone, reducedWeight

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

DynamicWeightFHeuristic

public DynamicWeightFHeuristic(VertexFunction gHeuristic,
VertexFunction hHeuristic,
VertexFunction wHeuristic,
double epsilon)
                        throws java.lang.Exception

DynamicWeightFHeuristic Constructor

Parameters:

gHeuristic - The G Heuristic

hHeuristic - The H Heuristic

wHeuristic - The W Heuristic

epsilon - Epsilon

Throws:

java.lang.Exception - Thrown if the Inputs are Invalid

Method Details

Pohl1970

public static final DynamicWeightFHeuristic Pohl1970(VertexFunction gHeuristic,
VertexFunction hHeuristic,
VertexFunction depthFunction,
double epsilon,
double anticipatedSolutionLength)

Construct the Pohl (1970) Version of the DynamicWeightFHeuristic

Parameters:

gHeuristic - The G Heuristic

hHeuristic - The H Heuristic

depthFunction - The Depth Function

epsilon - Epsilon

anticipatedSolutionLength - Length of the Anticipated Solution

Returns:

Pohl (1970) Version of the DynamicWeightFHeuristic

epsilon

public double epsilon()

Retrieve the "Epsilon" Weight

Returns:

The "Epsilon" Weight

wHeuristic

public VertexFunction wHeuristic()

Retrieve the W Heuristic

Returns:

The W Heuristic

evaluate

public double evaluate(Vertex<?> vertex)
                throws java.lang.Exception

Description copied from interface: VertexFunction

Compute the Value at the Vertex

Specified by:

evaluate in interface VertexFunction

Overrides:

evaluate in class FHeuristic

Parameters:

vertex - The Vertex

Returns:

The Value

Throws:

java.lang.Exception - Thrown if the Input are Invalid