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Active Learning strategies reduce the amount of labeled observations required by modern machine learning systems. These strategies find queries consisting of the most useful observations and ask a human user for their classification. Querying batches of multiple observations at once can provide various benefits, but also introduces additional complexity to the query selection process. While such batch query strategies exist for Multi-class Active Learning, previous applications of One-class Active learning were focused on sequential query strategies, where only one observation is labeled at a time. This work provide a categorization of existing batch query strategies for multi-class classification. Based on this categorization, we then propose multiple different batch query strategies for One-class Classification. We evaluate them with extensive experiments to determine, to what extend the concepts from Multi-class strategies work with One-class Classification. We then show how these new batch query strategies for One-class classification can be used to drastically reduce learning time without requiring more labeled observations than the use of previous sequential query strategies.
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