基於變換隱空間之風格化對話生成

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陳威良(Wei-Liang Chen) 查詢紙本館藏

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資訊管理學系

論文名稱

基於變換隱空間之風格化對話生成
(Transfer Latent Spaces for Stylized Dialogue Generation)

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至系統瀏覽論文 (2026-7-21以後開放)

摘要(中)

現今對話生成技術已經展現出強大的潛力，不過現今的對話系統通產出的回覆通
常平淡且一般。直接讓對話系統產出附有風格的回覆，是一個讓對話系統能夠生成多
元化回覆的解決方法。在這篇論文中我們提出附帶風格的對話生成方法，在生成對話
的同時做風格轉換，可以達到一個問句有多種風格的回覆，目的是為了讓機器可以在
不同對話場景用合適的風格給予回應，這項任務也可以說是有效得結合對話生成任務
及風格轉換任務，於是我們不僅重視回覆句能夠適當回覆，更強調能夠展現出強的烈
風格。
由於資料特性的關係，對話資料集通常是成對的資料，一個上文有對應的下文，
而風格文本的資料集通常是不成對的，於是我們利用監督式學習的方式建構對話模
型，用非監督式學習的方式建構風格轉換模型，並且使兩個模型共用一個解譯器，組
合成一個多工模型。我們提出使用輕量級的深度神經網路模型，將對話生成模型的潛
在空間橋接到附帶風格的潛在空間，使模型插入不同風格的深度神經網路模型，就能
生成對應風格的回覆，讓我們提出的模型生成出特別生動且令人印象深刻的回覆。文
中我們展示成功將對話潛在空間橋接到風格轉換的潛在空間的成果，並且我們利用多
個自動化評估指標搭配人工評估，多方面比較我們提出的模型與基準模型的成效，結
果指出，我們的模型能夠生成附帶強烈風格的回覆，風格強度優於基準模型許多，語
句的流暢度也優於基準模型，並且維持與基準模型相當的回覆適當性。不僅如此我們
希望我的的模型能有廣泛的適用性，我們利用兩個外部的對話資料集，測試我們模型
的適用性，結果顯示用於日常對話的文本有不錯的適用性。

摘要(英)

Dialogue generation technology has shown great potential, but currently dialogue systems
usually generate plain and general responses. Directly allowing the dialogue system to produce
stylized responses a solution that allow the dialogue systems to generate diversified responses.
In this study, we propose a dialogue generation method with styles. While generating dialogues,
we can do style conversion to achieve multiple styles of responses to a question. The purpose
is to allow the machine to respond with appropriate styles in different dialogue scenarios. This
task can also be said to be an effective combination of dialogue generation tasks and style
conversion tasks, so we not only attach importance to reply sentences to be able to respond
appropriately, but also emphasize the ability to reply with high style intensity.
With the data characteristics, the dialogue dataset is usually parallel data, one context has
a corresponding response, and the style text dataset is usually non-parallel, so we use supervised
learning to construct the dialogue generation model, using unsupervised learning method
constructs a style transfer model, and makes the two models shared a decoder and combine
them into a hybrid model. We propose using lightweight deep neural network models to bridge
the latent spaces of dialogue response generation model and style transfer model. This structure
allows the model to generate many different impressive style sentences. In chapter four, we
show the results of successfully bridging the latent space of dialogue generation to the latent
space of style transfer, and we use multiple auto evaluation metrics and human evaluation to
compare the effectiveness of our proposed model with the benchmark model in many aspects.
The results indicate that the style intensity and the fluency of sentences are much better than
that of the benchmark model, and the appropriateness of the responses is maintained
comparable to that of the benchmark model. Not only that, we use two external dialogue
datasets to test the applicability of our model. The results show that the text used for daily
dialogue has good applicability.

關鍵字(中)

★ 對話生成
★ 文字風格轉換
★ 深度學習
★ 多任務學習

關鍵字(英)

★ Dialogue generation
★ text style transfer
★ deep neural network
★ multi-task learning

論文目次

摘要 i
Abstract ii
Acknowledgement iii
Table of Contents iv
List of Tables vi
List of Figures vii
1 Introduction 1
1.1 Overviews 1
1.2 Motivation 2
1.3 Objectives 3
1.4 Thesis Organization 3
2 Related Works 4
2.1 Dialogue Generation 4
2.2 Text style transfer 8
2.2.1 With fully unlabeled data 8
2.2.2 With style-labeled data 8
2.2.3 With parallel data 10
2.3 Fusion of Supervised and Unsupervised Learning 14
2.4 Evaluation Metrics 15
2.4.1 Dialogue generation evaluation metrics 15
2.4.2 Style transfer evaluation metrics 18
2.5 Chapter Summary 20
3 Methodology 21
3.1 Model Overview 21
3.2 Model Architecture 23
3.3 Training Phase 25
3.3.1 Hybrid model 25
3.3.2 Plug-in DNN 26
3.4 Experiments 27
3.4.1 Datasets 27
3.4.2 Auto Evaluation 30
3.4.3 Human Evaluation 31
3.5 Experiment Settings 32
3.5.1 Preprocessing 32
3.5.2 Model settings 33
3.5.3 Proposed Experiment 33
4 Experiment Results 35
4.1 Experiment 1 – Effectiveness of Stylize Dialogue Generation Methods 35
4.1.1 Plug-in DNN 35
4.1.2 Evaluation 38
4.1.3 Summary of Experiment 1 42
4.2 Experiment 2 – Applicability of Stylized Dialogue Generation Model 44
4.2.1 Applying to Twitter 44
4.2.2 Applying to Movie Line 45
4.2.3 Summary for Experiment 2 46
5 Conclusion 47
5.1 Overall Summary 47
5.2 Contributions 48
5.3 Study limitations 48
5.4 Future Research 48
6 Reference 49
7 Appendixes 53
7.1 Experiment 1 53

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指導教授

柯士文(Shih-Wen Ke)

審核日期

2021-8-23

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