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Efficient classification for longitudinal data /Wang, Xianlong. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2010. / Printout. Includes bibliographical references (leaves 45-50). Also available on the World Wide Web.
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XCS performance and population structure in multi-step environmentsBarry, Alwyn January 2000 (has links)
No description available.
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Evaluating online text classification algorithms for email prediction in TaskTracer /Keiser, Victoria L. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2009. / Printout. Includes bibliographical references (leaf 19). Also available on the World Wide Web.
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Evolutionary reinforcement learning of spoken dialogue strategiesToney, Dave January 2007 (has links)
From a system developer's perspective, designing a spoken dialogue system can be a time-consuming and difficult process. A developer may spend a lot of time anticipating how a potential user might interact with the system and then deciding on the most appropriate system response. These decisions are encoded in a dialogue strategy, essentially a mapping between anticipated user inputs and appropriate system outputs. To reduce the time and effort associated with developing a dialogue strategy, recent work has concentrated on modelling the development of a dialogue strategy as a sequential decision problem. Using this model, reinforcement learning algorithms have been employed to generate dialogue strategies automatically. These algorithms learn strategies by interacting with simulated users. Some progress has been made with this method but a number of important challenges remain. For instance, relatively little success has been achieved with the large state representations that are typical of real-life systems. Another crucial issue is the time and effort associated with the creation of simulated users. In this thesis, I propose an alternative to existing reinforcement learning methods of dialogue strategy development. More specifically, I explore how XCS, an evolutionary reinforcement learning algorithm, can be used to find dialogue strategies that cover large state spaces. Furthermore, I suggest that hand-coded simulated users are sufficient for the learning of useful dialogue strategies. I argue that the use of evolutionary reinforcement learning and hand-coded simulated users is an effective approach to the rapid development of spoken dialogue strategies. Finally, I substantiate this claim by evaluating a learned strategy with real users. Both the learned strategy and a state-of-the-art hand-coded strategy were integrated into an end-to-end spoken dialogue system. The dialogue system allowed real users to make flight enquiries using a live database for an Edinburgh-based airline. The performance of the learned and hand-coded strategies were compared. The evaluation results show that the learned strategy performs as well as the hand-coded one (81% and 77% task completion respectively) but takes much less time to design (two days instead of two weeks). Moreover, the learned strategy compares favourably with previous user evaluations of learned strategies.
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Sistemas classificadores evolutivos para problemas multirrótulo / Learning classifier system for multi-label classificationVallim, Rosane Maria Maffei 27 July 2009 (has links)
Classificação é, provavelmente, a tarefa mais estudada na área de Aprendizado de Máquina, possuindo aplicação em uma grande quantidade de problemas reais, como categorização de textos, diagnóstico médico, problemas de bioinformática, além de aplicações comerciais e industriais. De um modo geral, os problemas de classificação podem ser categorizados quanto ao número de rótulos de classe que podem ser associados à cada exemplo de entrada. A abordagem mais investigada pela comunidade de Aprendizado de Máquina é a de classes mutuamente exclusivas. Entretanto, existe uma grande variedade de problemas importantes em que cada exemplo de entrada pode ser associado a mais de um rótulo ou classe. Esses problemas são denominados problemas de classificação multirrótulo. Os Learning Classifier Systems(LCS) constituem uma técnica de Indução de Regras de Classificação que tem como principal mecanismo de busca um Algoritmo Genético. Essa técnica busca encontrar um conjunto de regras que tenha alta precisão de classificação, que seja compreensível e que possua regras consideradas interessantes sob o ponto de vista de classificação. Apesar de existirem na literatura diversos trabalhos sobre os LCS para problemas de classificação com classes mutuamente exclusivas, pouco se tem conhecimento sobre um LCS que seja capaz de lidar com problemas multirrótulo. Dessa maneira, o objetivo desta monografia é apresentar uma proposta de LCS para problemas multirrótulo, que pretende induzir um conjunto de regras de classificação que produza um resultado eficaz e comparável com outras técnicas de classificação. De acordo com esse objetivo, apresenta-se também uma revisão bibliográfica dos temas envolvidos na proposta, que são: Sistemas Classificadores Evolutivos e Classificação Multirrótulo / Classification is probably the most studied task in the Machine Learning area, with applications in a broad number of real problems like text categorization, medical diagnosis, bioinformatics and even comercial and industrial applications. Generally, classification problems can be categorized considering the number of class labels associated to each input instance. The most studied approach by the community of Machine Learning is the one that considers mutually exclusive classes. However, there is a large variety of important problems in which each instance can be associated to more than one class label. This problems are called multi-label classification problems. Learning Classifier Systems (LCS) are a technique for rule induction which uses a Genetic Algorithm as the primary search mechanism. This technique searchs for sets of rules that have high classification accuracy and that are also understandable and interesting on the classification point of view. Although there are several works on LCS for classification problems with mutually exclusive classes, there is no record of an LCS that can deal with the multi-label classification problem. The objective of this work is to propose an LCS for multi-label classification that builds a set of classification rules which achieves results that are efficient and comparable to other multi-label methods. In accordance with this objective this work also presents a review of the themes involved: Learning Classifier Systems and Multi-label Classification
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Sistemas classificadores evolutivos para problemas multirrótulo / Learning classifier system for multi-label classificationRosane Maria Maffei Vallim 27 July 2009 (has links)
Classificação é, provavelmente, a tarefa mais estudada na área de Aprendizado de Máquina, possuindo aplicação em uma grande quantidade de problemas reais, como categorização de textos, diagnóstico médico, problemas de bioinformática, além de aplicações comerciais e industriais. De um modo geral, os problemas de classificação podem ser categorizados quanto ao número de rótulos de classe que podem ser associados à cada exemplo de entrada. A abordagem mais investigada pela comunidade de Aprendizado de Máquina é a de classes mutuamente exclusivas. Entretanto, existe uma grande variedade de problemas importantes em que cada exemplo de entrada pode ser associado a mais de um rótulo ou classe. Esses problemas são denominados problemas de classificação multirrótulo. Os Learning Classifier Systems(LCS) constituem uma técnica de Indução de Regras de Classificação que tem como principal mecanismo de busca um Algoritmo Genético. Essa técnica busca encontrar um conjunto de regras que tenha alta precisão de classificação, que seja compreensível e que possua regras consideradas interessantes sob o ponto de vista de classificação. Apesar de existirem na literatura diversos trabalhos sobre os LCS para problemas de classificação com classes mutuamente exclusivas, pouco se tem conhecimento sobre um LCS que seja capaz de lidar com problemas multirrótulo. Dessa maneira, o objetivo desta monografia é apresentar uma proposta de LCS para problemas multirrótulo, que pretende induzir um conjunto de regras de classificação que produza um resultado eficaz e comparável com outras técnicas de classificação. De acordo com esse objetivo, apresenta-se também uma revisão bibliográfica dos temas envolvidos na proposta, que são: Sistemas Classificadores Evolutivos e Classificação Multirrótulo / Classification is probably the most studied task in the Machine Learning area, with applications in a broad number of real problems like text categorization, medical diagnosis, bioinformatics and even comercial and industrial applications. Generally, classification problems can be categorized considering the number of class labels associated to each input instance. The most studied approach by the community of Machine Learning is the one that considers mutually exclusive classes. However, there is a large variety of important problems in which each instance can be associated to more than one class label. This problems are called multi-label classification problems. Learning Classifier Systems (LCS) are a technique for rule induction which uses a Genetic Algorithm as the primary search mechanism. This technique searchs for sets of rules that have high classification accuracy and that are also understandable and interesting on the classification point of view. Although there are several works on LCS for classification problems with mutually exclusive classes, there is no record of an LCS that can deal with the multi-label classification problem. The objective of this work is to propose an LCS for multi-label classification that builds a set of classification rules which achieves results that are efficient and comparable to other multi-label methods. In accordance with this objective this work also presents a review of the themes involved: Learning Classifier Systems and Multi-label Classification
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A Distributed Q-learning Classifier System for task decomposition in real robot learning problemsChapman, Kevin L. 04 March 2009 (has links)
A distributed reinforcement-learning system is designed and implemented on a mobile robot for the study of complex task decomposition in real robot learning environments. The Distributed Q-learning Classifier System (DQLCS) is evolved from the standard Learning Classifier System (LCS) proposed by J.H. Holland. Two of the limitations of the standard LCS are its monolithic nature and its complex apportionment of credit scheme, the bucket brigade algorithm (BBA). The DQLCS addresses both of these problems as well as the inherent difficulties faced by learning systems operating in real environments.
We introduce Q-learning as the apportionment of credit component of the DQLCS, and we develop a distributed learning architecture to facilitate complex task decomposition. Based upon dynamic programming, the Q-learning update equation is derived and its advantages over the complex BBA are discussed. The distributed architecture is implemented to provide for faster learning by allowing the system to effectively decrease the size of the problem space it must explore.
Holistic and monolithic shaping approaches are used to distribute reward among the learning modules of the DQLCS in a variety of real robot learning experiments. The results of these experiments support the DQLCS as a useful reinforcement learning paradigm and suggest future areas of study in distributed learning systems. / Master of Science
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Evolving complexity towards risk : a massive scenario generation approach for evaluating advanced air traffic management conceptsAlam, Sameer, Information Technology & Electrical Engineering, Australian Defence Force Academy, UNSW January 2008 (has links)
Present day air traffc control is reaching its operational limits and accommodating future traffic growth will be a challenging task for air traffic service providers and airline operators. Free Flight is a proposed transition from a highly-structured and centrally-controlled air traffic system to a self-optimized and highly-distributed system. In Free Flight, pilots will have the flexibility of real-time trajectory planning and dynamic route optimization given airspace constraints (traffic, weather etc.). A variety of advanced air traffc management (ATM) concepts are proposed as enabling technologies for the realization of Free Flight. Since these concepts can be exposed to unforeseen and challenging scenarios in Free Flight, they need to be validated and evaluated in order to implement the most effective systems in the field. Evaluation of advanced ATM concepts is a challenging task due to the limitations in the existing scenario generation methodologies and limited availability of a common platform (air traffic simulator) where diverse ATM concepts can be modeled and evaluated. Their rigorous evaluation on safety metrics, in a variety of complex scenarios, can provide an insight into their performance, which can help improve upon them while developing new ones. In this thesis, I propose a non-propriety, non-commercial air traffic simulation system, with a novel representation of airspace, which can prototype advanced ATM concepts such as conflict detection and resolution, airborne weather avoidance and cockpit display of traffic information. I then propose a novel evolutionary computation methodology to algorithmically generate a massive number of conflict scenarios of increasing complexity in order to evaluate conflict detection algorithms. I illustrate the methodology in detail by quantitative evaluation of three conflict detection algorithms, from the literature, on safety metrics. I then propose the use of data mining techniques for the discovery of interesting relationships, that may exist implicitly, in the algorithm's performance data. The data mining techniques formulate the conflict characteristics, which may lead to algorithm failure, using if-then rules. Using the rule sets for each algorithm, I propose an ensemble of conflict detection algorithms which uses a switch mechanism to direct the subsequent conflict probes to an algorithm which is less vulnerable to failure in a given conflict scenario. The objective is to form a predictive model for algorithm's vulnerability which can then be included in an ensemble that can minimize the overall vulnerability of the system. In summary, the contributions of this thesis are: 1. A non-propriety, non-commercial air traffic simulation system with a novel representation of airspace for efficient modeling of advanced ATM concepts. 2. An Ant-based dynamic weather avoidance algorithm for traffic-constrained enroute airspace. 3. A novel representation of 4D air traffic scenario that allows the use of an evolutionary computation methodology to evolve complex conflict scenarios for the evaluation of conflict detection algorithms. 4. An evaluation framework where scenario generation, scenario evaluation and scenario evolution processes can be carried out in an integrated manner for rigorous evaluation of advanced ATM concepts. 5. A methodology for forming an intelligent ensemble of conflict detection algorithms by data mining the scenario space.
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A Radial Basis Function Approach to a Color Image Classification Problem in a Real Time Industrial ApplicationSahin, Ferat 27 June 1997 (has links)
In this thesis, we introduce a radial basis function network approach to solve a color image classification problem in a real time industrial application. Radial basis function networks are employed to classify the images of finished wooden parts in terms of their color and species. Other classification methods are also examined in this work. The minimum distance classifiers are presented since they have been employed by the previous research.
We give brief definitions about color space, color texture, color quantization, color classification methods. We also give an intensive review of radial basis functions, regularization theory, regularized radial basis function networks, and generalized radial basis function networks. The centers of the radial basis functions are calculated by the k-means clustering algorithm. We examine the k-means algorithm in terms of starting criteria, the movement rule, and the updating rule. The dilations of the radial basis functions are calculated using a statistical method.
Learning classifier systems are also employed to solve the same classification problem. Learning classifier systems learn the training samples completely whereas they are not successful to classify the test samples. Finally, we present some simulation results for both radial basis function network method and learning classifier systems method. A comparison is given between the results of each method. The results show that the best classification method examined in this work is the radial basis function network method. / Master of Science
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New Challenges in Learning Classifier Systems: Mining Rarities and Evolving Fuzzy ModelsOrriols Puig, Albert 12 December 2008 (has links)
Durant l'última dècada, els sistemes classificadors (LCS) d'estil Michigan - sistemes d'aprenentatge automàtic que combinen tècniques de repartiment de crèdit i algorismes genètics (AG) per evolucionar una població de classificadors online- han renascut. Juntament amb la formulació dels sistemes de primera generació, s'han produït avenços importants en (1) el disseny sistemàtic de nous LCS competents, (2) la seva aplicació en dominis rellevants i (3) el desenvolupament d'anàlisis teòriques. Malgrat aquests dissenys i aplicacions importants, encara hi ha reptes complexos que cal abordar per comprendre millor el funcionament dels LCS i per solucionar problemes del món real eficientment i escalable.Aquesta tesi tracta dos reptes importants - compartits amb la comunitat d'aprenentatge automàtic - amb LCS d'estil Michigan: (1) aprenentatge en dominis que contenen classes estranyes i (2) evolució de models comprensibles on s'utilitzin mètodes de raonament similars als humans. L'aprenentatge de models precisos de classes estranyes és crític, doncs el coneixement clau sol quedar amagat en exemples d'aquestes, i la majoria de tècniques d'aprenentatge no són capaces de modelar la raresa amb precisió. La detecció de rareses sol ser complicat en aprenentatge online ja que el sistema d'aprenentatge rep un flux d'exemples i ha de detectar les rareses al vol. D'altra banda, l'evolució de models comprensibles és crucial en certs dominis com el mèdic, on l'expert acostuma a estar més interessat en obtenir una explicació intel·ligible de la predicció que en la predicció en si mateixa.El treball present considera dos LCS d'estil Michigan com a punt de partida: l'XCS i l 'UCS. Es pren l'XCS com a primera referència ja que és l'LCS que ha tingut més influencia fins al moment. L'UCS hereta els components principals de l'XCS i els especialitza per aprenentatge supervisat. Tenint en compte que aquesta tesi especialment se centra en problemes de classificació, l'UCS també es considera en aquest estudi. La inclusió de l'UCS marca el primer objectiu de la tesi, sota el qual es revisen un conjunt de punts que van restar oberts en el disseny del sistema. A més, per il·lustrar les diferències claus entre l'XCS i l'UCS, es comparen ambdós sistemes sobre una bateria de problemes artificials de complexitat acotada.L'estudi de com els LCS aprenen en dominis amb classes estranyes comença amb un estudi analític que descompon el problema en cinc elements crítics i deriva models per facetes per cadascun d'ells. Aquesta anàlisi s'usa com a eina per dissenyar guies de configuració que permeten que l'XCS i l'UCS solucionin problemes que prèviament no eren resolubles. A continuació, es comparen els dos LCS amb alguns dels sistemes d'aprenentatge amb més influencia en la comunitat d'aprenentatge automàtic sobre una col·lecció de problemes del món real que contenen classes estranyes. Els resultats indiquen que els dos LCS són els mètodes més robustos de la comparativa. Així mateix, es demostra experimentalment que remostrejar els conjunts d'entrenament amb l'objectiu d'eliminar la presencia de classes estranyes beneficia, en mitjana, el rendiment de les tècniques d'aprenentatge.El repte de crear models més comprensibles i d'usar mecanismes de raonament que siguin similars als humans s'aborda mitjançant el disseny d'un nou LCS per aprenentatge supervisat que combina les capacitats d'avaluació de regles online, la robustesa mostrada pels AG en problemes complexos i la representació comprensible i mètodes de raonament fonamentats proporcionats per la lògica difusa. El nou LCS, anomenat Fuzzy-UCS, s'estudia en detall i es compara amb una bateria de mètodes d'aprenentatge. Els resultats de la comparativa demostren la competitivitat del Fuzzy-UCS en termes de precisió i intel·ligibilitat dels models evolucionats. Addicionalment, s'usa Fuzzy-UCS per extreure models de classificació acurats de grans volums de dades, exemplificant els avantatges de l'arquitectura d'aprenentatge online del Fuzzy-UCS.En general, les observacions i avenços assolits en aquesta tesi contribueixen a augmentar la comprensió del funcionament dels LCS i en preparar aquests tipus de sistemes per afrontar problemes del món real de gran complexitat. Finalment, els resultats experimentals ressalten la robustesa i competitivitat dels LCS respecte a altres mètodes d'aprenentatge, encoratjant el seu ús per tractar nous problemes del món real. / Durante la última década, los sistemas clasificadores (LCS) de estilo Michigan - sistemas de aprendizaje automático que combinan técnicas de repartición de crédito y algoritmos genéticos (AG) para evolucionar una población de clasificadores online - han renacido. Juntamente con la formulación de los sistemas de primera generación, se han producido avances importantes en (1) el diseño sistemático de nuevos LCS competentes, (2) su aplicación en dominios relevantes y (3) el desarrollo de análisis teóricos. Pese a eso, aún existen retos complejos que deben ser abordados para comprender mejor el funcionamiento de los LCS y para solucionar problemas del mundo real escalable y eficientemente.Esta tesis trata dos retos importantes - compartidos por la comunidad de aprendizaje automático - con LCS de estilo Michigan: (1) aprendizaje en dominios con clases raras y (2) evolución de modelos comprensibles donde se utilicen métodos de razonamiento similares a los humanos. El aprendizaje de modelos precisos de clases raras es crítico pues el conocimiento clave suele estar escondido en ejemplos de estas clases, y la mayoría de técnicas de aprendizaje no son capaces de modelar la rareza con precisión. El modelado de las rarezas acostumbra a ser más complejo en entornos de aprendizaje online, pues el sistema de aprendizaje recibe un flujo de ejemplos y debe detectar las rarezas al vuelo. La evolución de modelos comprensibles es crucial en ciertos dominios como el médico, donde el experto está más interesado en obtener una explicación inteligible de la predicción que en la predicción en sí misma.El trabajo presente considera dos LCS de estilo Michigan como punto de partida: el XCS y el UCS. Se toma XCS como primera referencia debido a que es el LCS que ha tenido más influencia hasta el momento. UCS es un diseño reciente de LCS que hereda los componentes principales de XCS y los especializa para aprendizaje supervisado. Dado que esta tesis está especialmente centrada en problemas de clasificación automática, también se considera UCS en el estudio. La inclusión de UCS marca el primer objetivo de la tesis, bajo el cual se revisan un conjunto de aspectos que quedaron abiertos durante el diseño del sistema. Además, para ilustrar las diferencias claves entre XCS y UCS, se comparan ambos sistemas sobre una batería de problemas artificiales de complejidad acotada.El estudio de cómo los LCS aprenden en dominios con clases raras empieza con un estudio analítico que descompone el problema en cinco elementos críticos y deriva modelos por facetas para cada uno de ellos. Este análisis se usa como herramienta para diseñar guías de configuración que permiten que XCS y UCS solucionen problemas que previamente no eran resolubles. A continuación, se comparan los dos LCS con algunos de los sistemas de aprendizaje de mayor influencia en la comunidad de aprendizaje automático sobre una colección de problemas del mundo real que contienen clases raras.Los resultados indican que los dos LCS son los métodos más robustos de la comparativa. Además, se demuestra experimentalmente que remuestrear los conjuntos de entrenamiento con el objetivo de eliminar la presencia de clases raras beneficia, en promedio, el rendimiento de los métodos de aprendizaje automático incluidos en la comparativa.El reto de crear modelos más comprensibles y usar mecanismos de razonamiento que sean similares a los humanos se aborda mediante el diseño de un nuevo LCS para aprendizaje supervisado que combina las capacidades de evaluación de reglas online, la robustez mostrada por los AG en problemas complejos y la representación comprensible y métodos de razonamiento proporcionados por la lógica difusa. El sistema que resulta de la combinación de estas ideas, llamado Fuzzy-UCS, se estudia en detalle y se compara con una batería de métodos de aprendizaje altamente reconocidos en el campo de aprendizaje automático. Los resultados de la comparativa demuestran la competitividad de Fuzzy-UCS en referencia a la precisión e inteligibilidad de los modelos evolucionados. Adicionalmente, se usa Fuzzy-UCS para extraer modelos de clasificación precisos de grandes volúmenes de datos, ejemplificando las ventajas de la arquitectura de aprendizaje online de Fuzzy-UCS.En general, los avances y observaciones proporcionados en la tesis presente contribuyen a aumentar la comprensión del funcionamiento de los LCS y a preparar estos tipos de sistemas para afrontar problemas del mundo real de gran complejidad. Además, los resultados experimentales resaltan la robustez y competitividad de los LCS respecto a otros métodos de aprendizaje, alentando su uso para tratar nuevos problemas del mundo real. / During the last decade, Michigan-style learning classifier systems (LCSs) - genetic-based machine learning (GBML) methods that combine apportionment of credit techniques and genetic algorithms (GAs) to evolve a population of classifiers online - have been enjoying a renaissance. Together with the formulation of first generation systems, there have been crucial advances in (1) systematic design of new competent LCSs, (2) applications in important domains, and (3) theoretical analyses for design. Despite these successful designs and applications, there still remain difficult challenges that need to be addressed to increase our comprehension of how LCSs behave and to scalably and efficiently solve real-world problems.The purpose of this thesis is to address two important challenges - shared by the machine learning community - with Michigan-style LCSs: (1) learning from domains that contain rare classes and (2) evolving highly legible models in which human-like reasoning mechanisms are employed. Extracting accurate models from rare classes is critical since the key, unperceptive knowledge usually resides in the rarities, and many traditional learning techniques are not able to model rarity accurately. Besides, these difficulties are increased in online learning, where the learner receives a stream of examples and has to detect rare classes on the fly. Evolving highly legible models is crucial in some domains such as medical diagnosis, in which human experts may be more interested in the explanation of the prediction than in the prediction itself.The contributions of this thesis take two Michigan-style LCSs as starting point: the extended classifier system (XCS) and the supervised classifier system (UCS). XCS is taken as the first reference of this work since it is the most influential LCS. UCS is a recent LCS design that has inherited the main components of XCS and has specialized them for supervised learning. As this thesis is especially concerned with classification problems, UCS is also considered in this study. Since UCS is still a young system, for which there are several open issues that need further investigation, its learning architecture is first revised and updated. Moreover, to illustrate the key differences between XCS and UCS, the behavior of both systems is compared % and show that UCS converges quickly than XCS on a collection of boundedly difficult problems.The study of learning from rare classes with LCSs starts with an analytical approach in which the problem is decomposed in five critical elements, and facetwise models are derived for each element. The analysis is used as a tool for designing configuration guidelines that enable XCS and UCS to solve problems that previously eluded solution. Thereafter, the two LCSs are compared with several highly-influential learners on a collection of real-world problems with rare classes, appearing as the two best techniques of the comparison. Moreover, re-sampling the training data set to eliminate the presence of rare classes is demonstrated to benefit, on average, the performance of LCSs.The challenge of building more legible models and using human-like reasoning mechanisms is addressed with the design of a new LCS for supervised learning that combines the online evaluation capabilities of LCSs, the search robustness over complex spaces of GAs, and the legible knowledge representation and principled reasoning mechanisms of fuzzy logic. The system resulting from this crossbreeding of ideas, referred to as Fuzzy-UCS, is studied in detail and compared with several highly competent learning systems, demonstrating the competitiveness of the new architecture in terms of the accuracy and the interpretability of the evolved models. In addition, the benefits provided by the online architecture are exemplified by extracting accurate classification models from large data sets.Overall, the advances and key insights provided in this thesis help advance our understanding of how LCSs work and prepare these types of systems to face increasingly difficult problems, which abound in current industrial and scientific applications. Furthermore, experimental results highlight the robustness and competitiveness of LCSs with respect to other machine learning techniques, which encourages their use to face new challenging real-world applications.
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