Semi-supervised learning with connectivity-driven convolutional neural networks

Made available in DSpace on 2019-10-06T17:18:08Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-12-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The annotation of large datasets is an issue whose challenge increases as the number of labeled samples available to train the classifier reduces in comparison to the amount of unlabeled data. In this context, semi-supervised learning methods aim at discovering and propagating labels to unlabeled samples, such that their correct labeling can improve the classification performance. In this work, we propose a semi-supervised methodology that explores the optimum connectivity among unlabeled samples through the Optimum-Path Forest (OPF) classifier to improve the learning process of Convolution Neural Networks (CNNs). Our proposal makes use of the OPF to classify an unlabeled training set that is used to pre-train a CNN for further fine-tuning using the limited labeled data only. The proposed approach is experimentally validated on traditional datasets and provides competitive results in comparison to state-of-the-art semi-supervised learning methods. Federal University of Grande Dourados São Paulo State University - UNESP Corumbá Concessões S.A São Paulo State University - UNESP FAPESP: 2013/07375-0 FAPESP: 2014/12236-1 FAPESP: 2015/25739-4 FAPESP: 2016/19403-6 CNPq: 307066/2017-7 CNPq: 427968/2018-6