Author: Li, Yun
Title: Semi-supervised learning for speech emotion recognition
Advisors: Mak, M. W. (EIE)
Degree: M.Sc.
Year: 2019
Subject: Hong Kong Polytechnic University -- Dissertations
Human-computer interaction
Machine learning
Pattern recognition systems
Speech processing systems
Department: Faculty of Engineering
Pages: x, 40 pages : illustrations
Language: English
Abstract: Emotion recognition is an important field with extensive research and applications. Speech emotion recognition is also an irreplaceable part of human-computer interaction (HCI), which has been widely applied in daily life. At present, most of the speech emotion recognition systems use supervised learning algorithms. But they do not achieve good results. In order to improve the recognition performance, this thesis uses semi-supervised learning for speech emotion recognition. In the method, training is used on both labeled and labeled data, the labeled data is used for training an initial emotion classifier for selecting reliable samples from the unlabeled data. The selected unlabeled data are then added to the labeled data to retrain the classifier to improve the accuracy. To demonstrate the performance of this semi-supervised learning strategy, the performance of deep neural networks (DNN) based on semi-supervised learning is compared with the performance of DNNs trained on the labeled data only. Experiments show that the accuracy of DNNs based on semi-supervised is higher than DNNs without using the augmented data. However, this conclusion does not apply to all cases. In particular, the performance of semi-supervised learning is highly unstable, and accuracy cannot be improved if the size of database is too small.
Rights: All rights reserved
Access: restricted access

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