2004
AUTHORSJoão Gama , Pedro Medas , Gladys Castillo , Pedro Rodrigues
ABSTRACTMost of the work in machine learning assume that examples are generated at random according to some stationary probability distribution. In this work we study the problem of learning when the distribution that generate the examples changes over time. We present a method for detection of changes in the probability distribution of examples. The idea behind the drift detection method is to control the online error-rate of the algorithm. The training examples are presented in sequence. When a new training example is available, it is classified using the actual model. Statistical theory guarantees that while the distribution is stationary, the error will decrease. When the distribution changes, the error will increase. The method controls the trace of the online error of the algorithm. For the actual context we define a warning level, and a drift level. A new context is declared, if in a sequence of examples, the error increases reaching the warning level at example kw, and the drift level at example kd. This is an indication of a change in the distribution of the examples. The algorithm learns a new model using only the examples since kw. The method was tested with a set of eight artificial datasets and a real world dataset. We used three learning algorithms: a perceptron, a neural network and a decision tree. The experimental results show a good performance detecting drift and with learning the new concept. We also observe that the method is independent of the learning algorithm. More... »
PAGES286-295
Advances in Artificial Intelligence – SBIA 2004
ISBN
978-3-540-23237-7
978-3-540-28645-5
http://scigraph.springernature.com/pub.10.1007/978-3-540-28645-5_29
DOIhttp://dx.doi.org/10.1007/978-3-540-28645-5_29
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