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An Interpretable Semi-supervised Classifier using Rough Sets for Amended Self-labeling

Host Publication: IEEE World Congress on Computational Intelligence (WCCI) 2020

Authors: I. Del Carmen Grau Garcia, D. Sengupta, M. M. Garcia Lorenzo and A. Nowé

Publisher: IEEE

Publication Year: 2020


Abstract:

Semi-supervised classifiers combine labeled and unlabeleddata during the learning phase in order to increaseclassifier’s generalization capability. However, most successfulsemi-supervised classifiers involve complex ensemble structuresand iterative algorithms which make it difficult to explain theoutcome, thus behaving like black boxes. Furthermore, duringan iterative self-labeling process, mistakes can be propagated ifno amending procedure is used. In this paper, we build upon aninterpretable self-labeling grey-box classifier that uses a blackbox to estimate the missing class labels and a white box to makethe final predictions. We propose a Rough Set based approach foramending the self-labeling process. We compare its performanceto the vanilla version of our self-labeling grey-box and theuse of a confidence-based amending. In addition, we introducesome measures to quantify the interpretability of our model.The experimental results suggest that the proposed amendingimproves accuracy and interpretability of the self-labeling grey-box,thus leading to superior results when compared to state-of-the-art semi-supervised classifiers.

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