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Open AccessJournal ArticleDOI

Learning in the presence of concept drift and hidden contexts

TLDR
A family of learning algorithms that flexibly react to concept drift and can take advantage of situations where contexts reappear are described, including a heuristic that constantly monitors the system's behavior.
Abstract
On-line learning in domains where the target concept depends on some hidden context poses serious problems. A changing context can induce changes in the target concepts, producing what is known as concept drift. We describe a family of learning algorithms that flexibly react to concept drift and can take advantage of situations where contexts reappear. The general approach underlying all these algorithms consists of (1) keeping only a window of currently trusted examples and hypotheses; (2) storing concept descriptions and reusing them when a previous context re-appears; and (3) controlling both of these functions by a heuristic that constantly monitors the system's behavior. The paper reports on experiments that test the systems' perfomance under various conditions such as different levels of noise and different extent and rate of concept drift.

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Journal ArticleDOI

An automatic construction and organization strategy for ensemble learning on data streams

TL;DR: An ensemble learning algorithm is proposed, which furnishes training data for basic classifiers, starting from the up-to-date data chunk and searching for complement from past chunks while ruling out the data inconsistent with current concept and provides effective voting by adaptively distinguishing sensible classifiers from the else and engaging sensible ones as voters.
Journal ArticleDOI

An overview on the exploitation of time in collaborative filtering

TL;DR: This overview of a new generation of CF algorithms, using the time dimension as a key factor to improve recommendation models, is presented and important challenges to be faced in the near future are identified.
Proceedings ArticleDOI

Discovering decision rules from numerical data streams

TL;DR: A scalable learning algorithm to classify numerical, low dimensionality, high-cardinality, time-changing data streams, named SCALLOP provides a set of decision rules on demand which improves its simplicity and helpfulness for the user.
Proceedings Article

Temporal dynamics of user interests in tagging systems

TL;DR: This paper investigates the temporal dynamics of user interests in tagging systems and proposes a user-tag-specific temporal interests model for tracking users' interests over time and results show that this method can outperform state-of-the-art tag prediction algorithms.
Journal ArticleDOI

One-class learning and concept summarization for data streams

TL;DR: A new research problem of concept learning and summarization for one-class data streams is formulated to allow users to label instance groups, instead of single instances, as positive samples for learning, and to summarize concepts labeled by users over the whole stream.
References
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Proceedings ArticleDOI

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TL;DR: This paper regards learning as the phenomenon of knowledge acquisition in the absence of explicit programming, and gives a precise methodology for studying this phenomenon from a computational viewpoint.
Journal ArticleDOI

Instance-Based Learning Algorithms

TL;DR: This paper describes how storage requirements can be significantly reduced with, at most, minor sacrifices in learning rate and classification accuracy and extends the nearest neighbor algorithm, which has large storage requirements.
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Machine Learning: An Artificial Intelligence Approach

TL;DR: This book contains tutorial overviews and research papers on contemporary trends in the area of machine learning viewed from an AI perspective, including learning from examples, modeling human learning strategies, knowledge acquisition for expert systems, learning heuristics, discovery systems, and conceptual data analysis.
Journal ArticleDOI

Learnability and the Vapnik-Chervonenkis dimension

TL;DR: This paper shows that the essential condition for distribution-free learnability is finiteness of the Vapnik-Chervonenkis dimension, a simple combinatorial parameter of the class of concepts to be learned.
Journal ArticleDOI

Queries and Concept Learning

TL;DR: This work considers the problem of using queries to learn an unknown concept, and several types of queries are described and studied: membership, equivalence, subset, superset, disjointness, and exhaustiveness queries.