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Bidirectional Heuristic Search
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Book Synopsis Bi-directional and Heuristic Search in Path Problems by : Ira Pohl
Download or read book Bi-directional and Heuristic Search in Path Problems written by Ira Pohl and published by . This book was released on 1969 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bidirectional Heuristic Search by : George Politowski
Download or read book Bidirectional Heuristic Search written by George Politowski and published by . This book was released on 1984 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Front-to-end Bidirectional Heuristic Search by : Joseph Kelly Barker
Download or read book Front-to-end Bidirectional Heuristic Search written by Joseph Kelly Barker and published by . This book was released on 2015 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bidirectional heuristic search is a well-known technique for solving pathfinding problems. The goal in a pathfinding problem is to find paths---often of lowest cost---between nodes in a graph. Many real-world problems, such as finding the quickest route between two points in a map or measuring the similarity of DNA sequences, can be modeled as pathfinding problems. Bidirectional brute-force search does simultaneous brute-force searches forward from the initial state and backward from the goal states, finding solutions when both intersect. The idea of adding a heuristic to guide search is an old one, but has not seen widespread use and is generally believed to be ineffective. I present an intuitive explanation for the ineffectiveness of front-to-end bidirectional heuristic search. Previous work has examined this topic, but mine is the first comprehensive explanation for why most front-to-end bidirectional heuristic search algorithms will usually be outperformed by either unidirectional heuristic or bidirectional brute-force searches. However, I also provide a graph wherein bidirectional heuristic search does outperform both other approaches, as well as real-world problem instances from the road navigation domain. These demonstrate that there can be no general, formal proof of the technique's ineffectiveness. I tested my theory in a large number of popular search domains, confirming its predictions. One of my experiments demonstrates that a commonly-repeated explanation for the ineffectiveness of bidirectional heuristic search---that it spends most of its time proving solution optimality---is in fact wrong, and that with a strong heuristic a bidirectional heuristic search tends to find optimal solutions very late in a search. Finally, I introduce state-of-the-art solvers for the four-peg Towers of Hanoi with arbitrary initial and goal states, and peg solitaire, using disk-based, bidirectional algorithms. The Towers of Hanoi solver is a bidirectional brute-force solver which, as my theory predicts, outperforms a unidirectional heuristic solver. The peg solitaire solver is a bidirectional heuristic algorithm with novel heuristics. While my theory demonstrates that bidirectional heuristic search is generally ineffective, the peg solitaire domain demonstrates several caveats to my theory that this algorithm takes advantage of.
Book Synopsis Explorations in Bidirectional Heuristic Search by : Randy Beth Pollack
Download or read book Explorations in Bidirectional Heuristic Search written by Randy Beth Pollack and published by . This book was released on 1984 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heuristic Search by : Stefan Edelkamp
Download or read book Heuristic Search written by Stefan Edelkamp and published by Elsevier. This book was released on 2011-05-31 with total page 865 pages. Available in PDF, EPUB and Kindle. Book excerpt: Search has been vital to artificial intelligence from the very beginning as a core technique in problem solving. The authors present a thorough overview of heuristic search with a balance of discussion between theoretical analysis and efficient implementation and application to real-world problems. Current developments in search such as pattern databases and search with efficient use of external memory and parallel processing units on main boards and graphics cards are detailed. Heuristic search as a problem solving tool is demonstrated in applications for puzzle solving, game playing, constraint satisfaction and machine learning. While no previous familiarity with heuristic search is necessary the reader should have a basic knowledge of algorithms, data structures, and calculus. Real-world case studies and chapter ending exercises help to create a full and realized picture of how search fits into the world of artificial intelligence and the one around us. Provides real-world success stories and case studies for heuristic search algorithms Includes many AI developments not yet covered in textbooks such as pattern databases, symbolic search, and parallel processing units
Book Synopsis BS*: an Admissible Bidirectional Stated Heuristic Search Algorithm by : J. B. H. Kwa
Download or read book BS*: an Admissible Bidirectional Stated Heuristic Search Algorithm written by J. B. H. Kwa and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BS* written by J. B. H. Kwa and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Revisiting the Theory and Practice of Bidirectional and Suboptimal Heuristic Search Algorithms by : Jingwei Chen
Download or read book Revisiting the Theory and Practice of Bidirectional and Suboptimal Heuristic Search Algorithms written by Jingwei Chen and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heuristic Search is a general problem-solving method widely used in artificial intelligence (AI). This thesis presents contributions to heuristic search, including contributions to bidirectional optimal search and unidirectional suboptimal search. For bidirectional optimal search, this thesis presents fundamental theory for the analysis of necessary expansions and the minimum possible number of node expansions needed to solve a given problem in front-to-end heuristic search. A new front-to-end heuristic search algorithm, NBS, which has a worst case guarantee for the number of node expansions, is also presented in this thesis. For unidirectional suboptimal search, this thesis presents the theory of best-first bounded-suboptimal search using priority functions that do not need to perform state re-expansions as long as the search heuristic is consistent. Also, particular priority functions, such as piecewise linear functions are presented in this document. Several new priority functions can significantly outperform existing approaches according to empirical results.
Book Synopsis BS˜*œ[star]: an Admissible Bidirectional Staged Heuristic Search Algorithm by : James B. Kwa
Download or read book BS˜*œ[star]: an Admissible Bidirectional Staged Heuristic Search Algorithm written by James B. Kwa and published by . This book was released on 1988 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis BS*: an Admissible Bidirectional Stated Heuristic Search Algorithm by : James B. H. Kwa
Download or read book BS*: an Admissible Bidirectional Stated Heuristic Search Algorithm written by James B. H. Kwa and published by . This book was released on 1988 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BS* written by J. B. H. Kwa and published by . This book was released on 1988 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Bi-directional Heuristic Search Algorithm (An) by : Denis De Champeaux
Download or read book Improved Bi-directional Heuristic Search Algorithm (An) written by Denis De Champeaux and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Learning First Order Concept Definitions by Using a Bidirectional Heuristic Search Strategy by : Markus Wiese
Download or read book Learning First Order Concept Definitions by Using a Bidirectional Heuristic Search Strategy written by Markus Wiese and published by . This book was released on 1998 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Symbolic Bidirectional Breadth-first Heuristic Search by : Simon Kim Richards
Download or read book Symbolic Bidirectional Breadth-first Heuristic Search written by Simon Kim Richards and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A Reduced Ordered Binary Decision Diagram (BDD) is a symbolic data structure introduced to the model checking community by Bryant in 1986 to help verify properties of systems with very large state spaces. Recently, BDDs have been used in heuristic search algorithms as an approach to representing and solving search problems with very large state spaces. However, these algorithms are still not memory efficient. This thesis presents a symbolic heuristic search algorithm that uses BDDs in a memory efficient way by performing bidirectional breadth-first heuristic search. The approach is evaluated empirically against existing symbolic methods and is shown to provide a significant improvement in performance.
Book Synopsis Bidirectional Heuristic Search and Spectral S-box Simplification for the Cryptanalysis of the NBS Data Encryption Standard by : Eric Alexander Gullichsen
Download or read book Bidirectional Heuristic Search and Spectral S-box Simplification for the Cryptanalysis of the NBS Data Encryption Standard written by Eric Alexander Gullichsen and published by . This book was released on 1983 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ECAI 2004 by : Ramon López de Mántaras
Download or read book ECAI 2004 written by Ramon López de Mántaras and published by IOS Press. This book was released on 2004 with total page 1184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the Golden Age for Artificial Intelligence. The world is becoming increasingly automated and wired together. This also increases the opportunities for AI to help people and commerce. Almost every sub field of AI had now been used in substantial applications. Some of the fields highlighted in this publication are: CBR Technology; Model Based Systems; Data Mining and Natural Language Techniques. Not only does this publication show the activities, capabilities and accomplishments of the sub fields, it also focuses on what is happening across the field as a whole.
Download or read book EPIA'91 written by Pedro Barahona and published by Springer Science & Business Media. This book was released on 1991-09-23 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Portuguese Association for Artificial Intelligence has been organizing Portuguese Conferences on Artificial Intelligence, now held every second year, since 1985. This volume contains selected papers from the Fifth Conference on Artificial Intelligence. The conference has an international status: 62 contributions from 13 countries were received, of which 26 were from Portugal. To guarantee a high scientific standard, all the contributions were reviewed by at least three researchers,and only 20 papers were accepted and included in these proceedings. The papers are organized into sections on constraints, search, knowledge representation, temporal reasoning, planning, diagnosis and repair, and learning.