Classification and Novel Class Detection in Data Streams with Active Mining

We present ActMiner, which addresses four major challenges to data stream classification, namely, infinite length, concept-drift, concept-evolution, and limited labeled data Most of the existing data stream classification techniques address only the infinite length and concept-drift problems Our previous work, MineClass, addresses the concept-evolution problem in addition to addressing the infinite length and concept-drift problems Concept-evolution occurs in the stream when novel classes arrive However, most of the existing data stream classification techniques, including MineClass, require that all the instances in a data stream be labeled by human experts and become available for training This assumption is impractical, since data labeling is both time consuming and costly Therefore, it is impossible to label a majority of the data points in a high-speed data stream This scarcity of labeled data naturally leads to poorly trained classifiers ActMiner actively selects only those data points for labeling for which the expected classification error is high Therefore, ActMiner extends MineClass, and addresses the limited labeled data problem in addition to addressing the other three problems It outperforms the state-of-the-art data stream classification techniques that use ten times or more labeled data than ActMiner.