Strength or Accuracy: Credit Assignment in Learning Classifier Systems (Distinguished Dissertations)


Specifically, XCS like most classifiersystems employs a genetic algorithm for rule generation, and the way in whichit calculates rule fitness differsfrom earlier systems. Wilson described XCS as an accuracy-based classifiersystem and earlier systems as strength-based.

The difference is thus one of credit assignment, that is, of how a rule's contribution to the system's performance is estimated. Read more Read less. Special offers and product promotions Rs cashback on Rs or more for purchases made through Amazon Assistant. Offer period 1st September to 30th September.

Strength or Accuracy? Fitness Calculation in Learning Classifier Systems

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Start reading Strength or Accuracy on your Kindle in under a minute. Don't have a Kindle? Springer; Softcover reprint of the original 1st ed. Be the first to review this item Would you like to tell us about a lower price? This is especially the case if the fitness evaluation is a complex simulation, model, or computation. This places a premium on a variety of efficiency enhancement techniques.

In this tutorial, we will consider a four part decomposition of efficiency-enhancement techniques: We will develop a principled design methodology for different methodologies in each of efficiency-enhancement technique categories using facetwise modeling and dimensional arguments.

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The principled design methodology not only enables us to predict the maximum speed-up and scalability of each of the efficiency-enhancement methods, but also yields practical guidelines of using them in real-world problems. He has been actively consulting on genetic and evolutionary algorithms to industry, including a leading Israeli wireless company and a Fortune company. His masters thesis on efficiency enhancement techniques was awarded the William A.

Chittenden award for best graduate thesis in the Department of General Engineering. His research interests include efficiency enhancment of genetic agorithms, estimation of distribution algorithms, scalability of genetic and evolutionary computation, facetwise analysis of evolutionary algorithms, and multi-scale modeling in science and engineering.

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Distinguished Dissertations. Free Preview. © Strength or Accuracy: Credit Assignment in Learning Classifier Systems How Strength and Accuracy Differ. Strength or Accuracy: Credit Assignment in Learning Classifier Systems Through- out the thesis these two systems will be used as references in our reasoning We distinguish two categories of learning metric, introduce new metrics and.

Generalized Hill Climbing Algorithms: Theory and Practice Description: Generalized hill climbing GHC algorithms have been introduced as a unifying framework for addressing intractable discrete optimization problems. GHC algorithms provide a well-defined structure for classifying and studying a large body of stochastic and deterministic search strategies. Simulated annealing, threshold accepting, and tabu search, among others, can all be formulated as particular GHC algorithms. This tutorial reviews the GHC algorithm structure, and shows how many common search strategies can be described using the GHC algorithm framework.

The advantages and disadvantages of the GHC framework are presented. Convergence and performance results for GHC algorithms are also discussed. Opportunities for future research with GHC algorithms are presented.

He has a B. His theoretical research interests include the analysis and design of heuristics for intractable discrete optimization problems. His applied research interests address problems in the manufacturing, aviation security, and health-care industries. Symbolic Regression in GP Description: The automated induction of mathematical descriptions of data using genetic programming is commonly referred to as symbolic regression.

The main benefit of this approach is the perceived usefulness of the explicit mathematical expressions that are induced.

This tutorial will concentrate on issues and techniques that arise when trying to evolve such explicit symbolic descriptions on data. The tutorial will concentrate on appropriateness of fitness measures; size control; interpretability; optimization of constants; robustness and generalization error; issues arising through finite floating point precision.

Finally the Bayesian framework of induction will be presented in the context of symbolic regression. In Vitro Molecular Evolution Description: Unbeknown to most of the evolutionary computation researchers, biologists and biochemists have long been using the principle of genetic and evolutionary algorithms to design biomolecules with novel enzymatic activities. This approach, generally known as in vitro selection or directed evolution, starts with a library of candidate molecules and uses biochemical variation and selection techniques to derive fitter target molecules.

On the other hand, biomolecules such as DNA and RNA provide interesting alternative materials for building evolutionary computers and other evolvable machines. The existing biochemical techniques, such as polymerase chain reaction, gel electrophoresis, and fluorochromatography, provide massively parallel operators for assembly, replication, variation, and selection of "molecular genetic programs. This tutorial aims 1 to review recent results on directed evolution from life sciences and biotechnology and 2 to provide the EC community with new research issues as to the theory, methodology, technology, and applications inspired by the in vitro molecular evolution approach.

We will discuss the challenges and opportunities we face as EC researchers. The tutorial assumes an introductory level of knowledge in genetic and evolutionary computation, but does not require backgrounds in molecular biology or chemistry. EC researchers interested in bio- and nano-technologies would find this tutorial most exciting. He received his Ph. Evolutionary Neural Networks Description: Compared to traditional e.

In this tutorial, we will review 1 neuroevolution methods that evolve fixed-topology networks, network topologies, and network construction processes, 2 ways of combining traditional neural network learning algorithms with evolutionary methods, and 3 applications of neuroevolution to game playing, robot control, resource optimization, and cognitive science. He received an M. His recent research focuses on methods for evolving neural networks and applying these methods to game playing, robotics, and intelligent control.

He is an author of over articles on neuroevolution, connectionist natural language processing, and the computational neuroscience of the visual cortex. Fitness Approximation in Evolutionary Computation Description: Evolutionary algorithms need a large number of fitness evaluations to get an acceptable solution. This poses huge difficulties in employing EAs to solve a wider range of real-world problems because fitness evaluations is often very expensive. This tutorial provides an overview of various methods for reducing expensive fitness evaluations in evolutionary computation.

The tutorial covers the following major issues: Yaochu Jin received the Ph. His research interests include artificial intelligence, genetic algorithms, design optimization, computational biology, and machine learning. He has served on the program committees of several conferences including the Genetic and Evolutionary Computation. When used for global optimization, Evolutionary Algorithms EAs can be seen as unconstrained optimization techniques. Therefore, they require an additional mechanism to incorporate constraints of any kind i. Although the use of penalty functions very popular with mathematical programming techniques may seem an obvious choice, this sort of approach requires a careful fine tuning of the penalty factors to be used.

Otherwise, an EA may be unable to reach the feasible region if the penalty is too low or may reach quickly the feasible region but being unable to locate solutions that lie in the boundary with the infeasible region if the penalty is too severe. This has motivated the development of a number of approaches to incorporate constraints into the fitness function of an EA.

Strength or Accuracy: Credit Assignment in Learning Classifier Systems

This tutorial will cover the main proposals in current use, including novel approaches such as the use of tournament rules based on feasibility, multiobjective optimization concepts, hybrids with mathematical programming techniques e. Other topics such as the importance of maintaining diversity, current benchmarks and the use of alternative search engines e. Then, he was awarded a scholarship from the Mexican government to pursue graduate studies in Computer Science at Tulane University.

His PhD thesis was one of the first in the field now called evolutionary multiobjective optimization. From Theory to Application Description: Rule-based evolutionary online learning systems, often referred to as Michigan-style learning classifier systems LCSs , were proposed nearly thirty years ago originally calling them cognitive systems. The XCS classifier system maybe its currently most successful and most promising representative. As all LCSs, XCS combines the strength of reinforcement learning with the generalization and search capabilities of genetic algorithms resulting in a flexible, online-learning and generalizing predictive learning system.

This tutorial focuses on the questions how and when XCS works and, derived from these questions, how XCS can be designed and enhanced to solve diverse online reinforcement, control, or general predictive problems. Particularly, a facetwise approach is proposed that partitions the learning biases of the system and analyzes the components separately respecting their possible interactions.

The insights gained directly lead to a comprehensive application manual for XCS that outlines its representation- and task-dependent successful design and application to the problem at hand.

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Due to the simple, facetwise approach, the successful creation of more competent, truly cognitive systems appears to be within our grasp. One key feature of AGPS is that is was designed as a geometry programming language, with a customizable GUI, allowing for custom applications to be easily written and tailored for domain-specific tasks.

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This also allows engineering processes to be highly automated.