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            <title xml:lang="en">Active learning of constraints for weighted feature selection</title>
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                <forename type="first">Samah</forename>
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              <p>airwise constraints, a cheaper kind of supervision information that does not need to reveal the class labels of data points, were initially suggested to enhance the performance of clustering algorithms. Recently, researchers were interested in using them for feature selection. However, in most current methods, pairwise constraints are provided passively and generated randomly over multiple algorithmic runs by which the results are averaged. This leads to the need of a large number of constraints that might be redundant, unnecessary, and under some circumstances even inimical to the algorithm’s performance. It also masks the individual effect of each constraint set and introduces a human labor-cost burden. Therefore, in this paper, we suggest a framework for actively selecting and then propagating constraints for feature selection. For that, we benefit from the graph Laplacian that is defined on the similarity matrix. We assume that when a small perturbation of the similarity value between a data couple leads to a more well-separated cluster indicator based on the second eigenvector of the graph Laplacian, this couple is definitely expected to be a pairwise query of higher and more significant impact. Constraints propagation on the other side ensures increasing supervision information while decreasing the cost of human-labor. Finally, experimental results validated our proposal in comparison to other known feature selection methods and proved to be prominent.</p>
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