基於循環式對抗性網路的數據增量及梯度察覺純化防禦機制建立強健式語音情緒辨識模型

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研究生：	蘇柏豪 Su, Bo-Hao
論文名稱：	基於循環式對抗性網路的數據增量及梯度察覺純化防禦機制建立強健式語音情緒辨識模型 Building a Robust Speech Emotion Recognition using Cycle-GAN-based Data Augmentation and Gradient-Aware Purification Adversarial Defense Mechanism
指導教授：	李祈均 Lee, Chi-Chun
口試委員:	廖元甫 Liao, Yuan-Fu 王新民 Wang, Hsin-Ming 陳柏琳 Chen, Po-Lin 林嘉文 Lin, Chia-Wen 劉奕汶 Liu, Yi-Wen
學位類別：	博士 Doctor
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2023
畢業學年度：	112
語文別：	英文
論文頁數：	86
中文關鍵詞：	語音情緒辨識、強健式學習、循環式對抗性網路、對抗式學習
外文關鍵詞：	Speech Emotion Recognition, Robustness Learning, Cycle Generative Adversarial Learning, Adversarial Learning
相關次數：	點閱：2 下載：0
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語音情緒識別是一門重要的技術並在人機互動的過程中扮演著不可或缺的角色，它可以讓機器理解人的感受並增加整個過程的流暢度及適當的同理心。然而，情緒是非常複雜的一個感受，需要非常高變化度和多樣的環境來同時建構。要單純靠單一資料庫來建構模型並且直接應用在日常生活中是非常困難的一個任務。再者，語音情緒資料庫的高度情境化的特性更嚴重地成為了發展語音情緒辨識模型強健性的一大阻礙。因此，在這篇論文當中，我們將著墨於探討情緒語音識別的強健性，並透過不同的兩個觀點來探討，第一個觀點是建構一個強健的語音情緒辨識模型可以直接被應用在跨資料庫(跨域)的情境底下，第二個則是語音情緒辨識模型的防禦對抗式樣本的能力提升。
在此論文中我們設計了兩個計算框架來處理這兩個語音情緒辨識模型強健式的議題。首先，我們利用生成式模型的優點來增加資源資料庫的變異度始知能夠涵蓋到目標資料庫，而不是單純的去平移資料域和目標域這兩個分佈。我們設計的資料庫察覺機制能夠在生成類目標樣本的時候去捕捉到不同的資源資料庫之間的特性，進而利用之生成更接近目標資料庫的樣本，最後透過資料增量來提升語音情緒辨識模型的精準度。再來，深度模型的弱點在近期被高度凸顯，同時也是一個非常新興的研究領域，尤其是針對對抗式樣本的強健性這點。因此，我們去全面地探究了對抗式樣本對語音情緒辨識模型的影響，同時提供了一個針對梯度察覺做純化的防禦機制，它能夠加強模型在這些相對容易被攻擊的特徵點上作純化。此外，我們還設計了一個可以公平地衡量模型防禦能力的指標來提供給相關研究領域的學者使用。整體而言，兩個我們所提出的計算框架對比最先進的模型都展現出了卓越的進步，也展示了一些在語音情緒識別強健性的遠見發現。

Speech emotion recognition (SER) is a crucial technique that can equip machines with the understanding of human feelings and increase smoothness and empathy properly. However, emotion is a sophisticated task that needs a wide variety and diverse environment as well. It's hard to build a model on a single corpus and apply it to different scenarios directly. Furthermore, the highly contextualized characteristics of speech emotion datasets severely hinder the robustness of SER models. Hence, in this dissertation, we aim to discuss the robustness of SER models in two aspects, which are building a robust SER model that can be directly applied to the cross-corpus scenario and a model that can defend the adversarial attacks.
Specifically, we design two frameworks to tackle these robustness issues of SER models. First of all, instead of shifting the domain between source and target, we utilize the pros of the generative model to increase the variety coverage of our source corpus. While synthesizing the samples, the corpus-aware mechanism is able to capture the uniqueness of each different source dataset and provide a better target-like sample for the augmentation. Secondly, the vulnerability of the deep-learning model is the latest topic and has been revealed recently, especially under adversarial attacks. Hence, we probe the effects of adversarial attacks in SER domain comprehensively and provide a gradient-aware purification module that can reinforce the sanitization of easily-poisoned locations. Furthermore, we provide a new metric that can fairly evaluate the defense ability of each model as well. Overall, both the proposed models manifest significant improvements when compared to state-of-the-art models and show lots insights in the SER robustness domain.

摘要 i
Abstract iii
Acknowledgements v
Contents vii
List of Figures ix
List of Tables xi
Introduction 1
1 Background and Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Research Goal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1 Robustness of Domain Mismatch . . . . . . . . . . . . . . . . . . . . 3
2.2 Robustness of Adversarial Defense . . . . . . . . . . . . . . . . . . . 5
3 Dissertation Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Unsupervised Cross-Corpus Speech Emotion Recognition Using a Multi-Source Cycle-GAN 7
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 RELATED WORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1 Adversarial Learning-Based Models . . . . . . . . . . . . . . . . . . . 11
2.2 Autoencoder-Based Models . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 GAN-Based Models . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.4 Data Augmentation-Based Models . . . . . . . . . . . . . . . . . . . . 12
3 RESEARCH METHODOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Speech Emotion Corpus . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Acoustic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 Corpus-Aware Emotional Cycle-GAN . . . . . . . . . . . . . . . . . . 15
3.4 Target Emotion Classifier . . . . . . . . . . . . . . . . . . . . . . . . 20
4 Experimental evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Upper Bound Experimental Setup . . . . . . . . . . . . . . . . . . . . 20
4.2 Cross-Corpus Experimental Setup . . . . . . . . . . . . . . . . . . . . 21
4.3 Baseline Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5 Experimental Results and Analysis . . . . . . . . . . . . . . . . . . . . . . . . 24
5.1 Upper Bound Experiment Result . . . . . . . . . . . . . . . . . . . . . 24
5.2 Baseline Comparisons . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.3 Ablation Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.4 Representation Visualization . . . . . . . . . . . . . . . . . . . . . . . 29
5.5 Learned Attention Weights Visualization . . . . . . . . . . . . . . . . 30
5.6 Extending Source/Target Experiments . . . . . . . . . . . . . . . . . . 34
6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Gradient-Aware Purified Adversarial-Robust Defense Model for Speech Emotion Recognition 39
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2 RELATED WORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
2.1 Adversarial Training-based Models . . . . . . . . . . . . . . . . . . . 43
2.2 Adversarial Regularization-based Models . . . . . . . . . . . . . . . . 43
2.3 Anti-adversarial Pre-processing Strategies . . . . . . . . . . . . . . . . 44
2.4 Defense Mechanism-based Models . . . . . . . . . . . . . . . . . . . 44
3 RESEARCH METHODOLOGY . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.1 Speech Emotion Corpus . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.2 Acoustic Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3 Gradient-Aware Adversarial Defense SER Model . . . . . . . . . . . . 47
4 Experimental settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.1 Training Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.2 Evaluation Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.3 Evaluation Metrics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
4.4 Baseline Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5 Experimental Results and Analysis . . . . . . . . . . . . . . . . . . . . . . . . 60
5.1 Clean Evaluation Experiment . . . . . . . . . . . . . . . . . . . . . . 60
5.2 Defense Capability Examination Experiment . . . . . . . . . . . . . . 61
5.3 Gradient-Aware Weighted Matrix Analysis . . . . . . . . . . . . . . . 65
5.4 Ablation Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6 Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Conclusion 73
1 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2 Future Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
References 75
                                

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