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Training machine learning models often requires large labelled datasets, which can be both expensive and time-consuming to obtain. Active learning aims to selectively choose which data is labelled in order to minimize the total number of labels required to train an effective model. This paper compares model-free and model-based approaches to active learning for regression, finding that model-free approaches, in addition to being less computationally intensive to implement, are more effective in improving the performance of linear regressions than model-based alternatives.
O'Neill, J., Delany, S. J. & MacNamee, B. (2016) Model-Based and Model-Free Active Learning for Regression, 16th Annual UK Workshop on Computational Intelligence, Lancaster, 7th - 9th September, 2016.