Lecture11 - neural networks
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This document provides an overview of neural networks and backpropagation algorithms. It discusses how neural networks are inspired by biological brains and how they can be used to perform complex classification tasks. The key topics covered include perceptrons, Adaline networks, multi-layer perceptrons, backpropagation for training multi-layer networks, and an example of how backpropagation works to minimize error in a simple two-layer network.
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Python for brain mining: (neuro)science with state of the art machine learnin...Gael Varoquaux This document discusses using Python for neuroscience applications with machine learning and data visualization. It describes using tools like Mayavi, scikit-learn, and joblib for tasks like analyzing brain imaging data, learning functional regions of the brain from spontaneous activity, and modeling interactions between brain regions. It highlights challenges in analyzing high-dimensional brain data with few observations and discusses how machine learning can help address these challenges by incorporating expert knowledge and regularization.
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Lecture6 - C4.5
Lecture6 - C4.5Albert Orriols-Puig C4.5 enhances ID3 by making it more robust to noise, able to handle continuous attributes, deal with missing data, and convert decision trees to rules. It avoids overfitting through pre-pruning and post-pruning techniques. When dealing with continuous attributes, it evaluates all possible split points and chooses the optimal one. It treats missing data as a separate value but this is not always appropriate. It generates rules from trees in a greedy manner by pruning conditions to reduce estimated error. The next topic will be on instance-based classifiers.
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Camp IT: Making the World More Efficient Using AI & Machine Learning
Camp IT: Making the World More Efficient Using AI & Machine LearningKrzysztof Kowalczyk Slides from the introductory lecture I gave for students at Camp IT 2019. I tried to cover artificial inteligence, machine learning, most popular algorithms and their applications to business as broadly as possible - for in-depth materials on the given topics, see links and references in the presentation.
Deep Learning And Business Models (VNITC 2015-09-13)
Deep Learning And Business Models (VNITC 2015-09-13)Ha Phuong Deep Learning and Business Models
Tran Quoc Hoan discusses deep learning and its applications, as well as potential business models. Deep learning has led to significant improvements in areas like image and speech recognition compared to traditional machine learning. Some business models highlighted include developing deep learning frameworks, building hardware optimized for deep learning, using deep learning for IoT applications, and providing deep learning APIs and services. Deep learning shows promise across many sectors but also faces challenges in fully realizing its potential.
Variational Autoencoders VAE - Santiago Pascual - UPC Barcelona 2018
Variational Autoencoders VAE - Santiago Pascual - UPC Barcelona 2018Universitat Politècnica de Catalunya
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More from Albert Orriols-Puig (20)
Lecture1 AI1 Introduction to artificial intelligence
Lecture1 AI1 Introduction to artificial intelligenceAlbert Orriols-Puig This document provides an overview of the history and development of artificial intelligence, beginning with early concepts of artificial beings and progressing through milestones like the Dartmouth Conference, development of expert systems in the 1970s-80s, advances in the 1990s with things like Deep Blue and robotics, and examples of modern applications like robotic vacuums and self-driving cars through challenges like DARPA's Grand Challenge.
Lecture24
Lecture24Albert Orriols-Puig This document summarizes a lecture on learning classifier systems. It introduces learning classifier systems and provides examples of their applications in reinforcement learning, supervised learning, and function approximation. Specifically, it discusses XCS and its use in solving maze problems and the mountain car problem. It also provides an example of a learning classifier system solving boolean functions. Finally, it outlines current real-life applications of learning classifier systems in data mining, modeling market traders, autonomous robotics, and modeling artificial ecosystems. It concludes by introducing anticipatory learning classifier systems which can learn condition-action-effect relations.
Lecture23
Lecture23Albert Orriols-Puig This document provides an introduction and overview of learning classifier systems (LCS), including:
1) It discusses the origins of LCS from Holland's vision of adaptive systems and genetic algorithms. Early implementations included Holland and Reitman's CS-1 system.
2) It describes two main types of LCS - Michigan-style systems which use a population of rules and reinforcement learning, and Pittsburgh-style systems which use a genetic algorithm on whole individuals.
3) It explains that Michigan-style LCS represent knowledge as a population of condition-action rules, use reinforcement learning to apportion credit, and apply a genetic algorithm to evolve the rule population over time.
Lecture22
Lecture22Albert Orriols-Puig This document summarizes a lecture on reinforcement learning and the Q-learning algorithm. Q-learning is a temporal difference learning method that allows an agent to learn optimal policies without needing a model of the environment's dynamics. The algorithm works by learning an action-value function (Q-function) that directly approximates the optimal Q-function through Q-backups without requiring a model of the environment. Pseudocode is provided for the basic Q-learning algorithm. Examples are also given showing how Q-learning can be used to learn an optimal policy for navigating a maze.
Lecture21
Lecture21Albert Orriols-Puig This document provides an introduction to reinforcement learning. It discusses how reinforcement learning aims to learn behaviors through trial-and-error interaction with an environment to maximize rewards. The document outlines the basic components of a reinforcement learning problem including states, actions, rewards, and policies. It provides examples of reinforcement learning problems like pole balancing and the mountain car problem to illustrate these concepts. The next class will cover how to learn policies to solve reinforcement learning problems.
Lecture20
Lecture20Albert Orriols-Puig 1. This lecture discusses genetic fuzzy systems and genetic algorithms for tuning different components of fuzzy rule-based systems, including rules, membership functions, and inference parameters.
2. Genetic algorithms can be used for genetic rule learning, genetic rule selection to determine the best rules, and genetic database learning to determine optimal membership function shapes.
3. Simultaneous genetic learning of multiple knowledge base components can improve results by accounting for dependencies between components, though it increases complexity.
Lecture19
Lecture19Albert Orriols-Puig This document provides an overview of genetic fuzzy systems. It begins with a recap of supervised and unsupervised machine learning techniques. It then discusses fuzzy logics and how they can be used to represent imprecise concepts using membership functions. Fuzzy systems that use fuzzy logic to model relationships between variables are introduced. Genetic fuzzy systems combine fuzzy systems with genetic algorithms to design the fuzzy rules, membership functions, and inference engines. The genetic algorithm evolves populations of candidate fuzzy systems through selection, crossover and mutation to optimize system performance.
Lecture16 - Advances topics on association rules PART III
Lecture16 - Advances topics on association rules PART IIIAlbert Orriols-Puig This document provides an introduction to sequential pattern mining, which aims to find patterns or associations between items where the order or sequence is important. It defines key concepts like sequential patterns, frequent sequences, and support. An example database of customer transaction sequences is given to illustrate sequential patterns with a minimum support threshold of 25%. Key 1-sequence, 2-sequence, and 3-sequence patterns meeting the support threshold are identified in the example data. The document discusses how sequential pattern mining is useful for applications like analyzing the sequence of items customers buy or their navigational patterns on a website.
Lecture15 - Advances topics on association rules PART II
Lecture15 - Advances topics on association rules PART IIAlbert Orriols-Puig This document summarizes a lecture on advanced topics in association rule mining, including mining frequent patterns without candidate generation, multiple level association rules (AR), and quantitative AR. It discusses how concept hierarchies can be used to find associations between items at different levels of abstraction. Algorithms for mining generalized AR with taxonomies are presented, along with optimizations like pre-computing ancestors and pruning redundant rules. The importance of hierarchies for modeling real-world applications is highlighted.
Lecture14 - Advanced topics in association rules
Lecture14 - Advanced topics in association rulesAlbert Orriols-Puig This document summarizes lecture 14 on advanced topics in association rule mining. It begins with a recap of lecture 13 and the challenges of Apriori, including its multiple database scans and large number of candidate itemsets generated. It then introduces FP-growth as an alternative method that avoids candidate generation by building an FP-tree structure from the database in one scan. The document explains how to build the FP-tree and then mine it to extract frequent patterns directly without candidate generation. It notes that FP-growth scales better than Apriori as the support threshold decreases since it avoids costly candidate generation and testing.
Lecture13 - Association Rules
Lecture13 - Association RulesAlbert Orriols-Puig This document provides an introduction to association rule mining. It begins with an overview of association rule mining and its application to market basket analysis. It then discusses key concepts like support, confidence and interestingness of rules. The document introduces the Apriori algorithm for mining association rules, which works in two steps: 1) generating frequent itemsets and 2) generating rules from frequent itemsets. It provides examples of how Apriori works and discusses challenges in association rule mining like multiple database scans and candidate generation.
Lecture10 - Naïve Bayes
Lecture10 - Naïve BayesAlbert Orriols-Puig This document provides a summary of Lecture 10 on Bayesian decision theory and Naive Bayes machine learning algorithms. It begins with a recap of Lecture 9 on using probability to classify patterns into categories. It then discusses how to apply these probabilistic concepts to both nominal and continuous variables. A medical example is presented to illustrate Bayesian classification. The document concludes by explaining the Naive Bayes algorithm for classification tasks and providing a worked example of how it is trained and makes predictions.
Lecture9 - Bayesian-Decision-Theory
Lecture9 - Bayesian-Decision-TheoryAlbert Orriols-Puig This document provides a summary of Lecture 9 on Bayesian decision theory and machine learning. The lecture begins with a recap of previous lectures on topics like decision trees, k-nearest neighbors, and using probabilities for classification. It then discusses Thomas Bayes and the origins of Bayesian probability. Key concepts from Bayes' theorem are explained, like calculating posterior probabilities. Examples are provided to illustrate Bayesian reasoning, such as calculating the probability that the Pope is an alien or whether to switch doors in the Monty Hall problem. The lecture concludes by discussing how these Bayesian concepts can be applied to machine learning.
Lecture8 - From CBR to IBk
Lecture8 - From CBR to IBkAlbert Orriols-Puig 1) Instance based learning and case-based reasoning (CBR) provide frameworks for incorporating learning into k-nearest neighbors (kNN) classification.
2) CBR formalizes kNN into five phases: preprocessing training data, retrieving similar cases, reusing solutions, revising solutions if needed, and retaining lessons.
3) Key challenges for CBR include reducing the cost of case matching, automatically generating distance functions tailored to problems, and extracting explanations from cases.
Lecture4 - Machine Learning
Lecture4 - Machine LearningAlbert Orriols-Puig This document provides a summary of Lecture 4 of an introduction to machine learning course. It recaps topics from Lecture 3, including different machine learning paradigms and problems that will be studied like classification, regression, clustering, and association analysis. It then discusses classification and prediction problems in more detail. Specific algorithms for classification, regression, clustering and association rule mining are introduced. Finally, it previews that the next class will focus on the C4.5 classification algorithm.
Lecture3 - Machine Learning
Lecture3 - Machine LearningAlbert Orriols-Puig The document summarizes key points from Lecture 3 of an introduction to machine learning course. It discusses desired characteristics of machine learning techniques, including the ability to generalize but not too much, being robust, learning high-quality models, being scalable and efficient, being explanatory, and being deterministic. It also provides an overview of machine learning paradigms like inductive learning, explanation-based learning, analogy-based learning, evolutionary learning, and connectionist learning. Finally, it outlines specific problems that will be studied in the course, such as data classification, statistical learning, association analysis, and clustering.
Lecture2 - Machine Learning
Lecture2 - Machine LearningAlbert Orriols-Puig This document summarizes the second lecture in an introduction to machine learning course. The lecture discusses the definition of machine learning as improving performance on a task through experience. It also covers why machine learning is increasingly appealing due to growing data and computational power. Examples of applying machine learning to data mining tasks like medical prediction are provided. The lecture concludes by discussing emerging areas for machine learning like semantic networks and individual recommender systems.
Lecture1 - Machine Learning
Lecture1 - Machine LearningAlbert Orriols-Puig This document provides an introduction and agenda for Lecture 1 of an Introduction to Machine Learning course. The lecture will cover goals for the course from both the instructor and student perspectives. It will also discuss the major project which will account for 70% of the grade, requiring students to conduct and present original machine learning research. The next class will cover what machine learning is, why it is important, and different machine learning paradigms.
New Challenges in Learning Classifier Systems: Mining Rarities and Evolving F...
New Challenges in Learning Classifier Systems: Mining Rarities and Evolving F...Albert Orriols-Puig The document discusses new challenges in learning classifier systems (LCS) when dealing with domains containing rare classes. It proposes using a design decomposition approach to analyze how LCS address rare classes. Specifically, it examines how the extended classifier system (XCS) handles rare classes. It identifies five critical elements of LCS that are important for detecting small niches associated with rare classes: 1) estimating classifier parameters correctly, 2) providing representatives of rare niches during initialization, 3) generating and growing representatives of rare niches, 4) adjusting the genetic algorithm application rate, and 5) ensuring representatives of rare niches dominate their niches. The document focuses on analyzing the first element of estimating classifier parameters for XCS when dealing with domains
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