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研究生: 泰提潘
Tipajin Thaipisutikul
論文名稱: 基於上下文信息的新型順序推薦深度學習模型
A Novel Sequential Recommendation Deep Learning Model based on Contextual Information
指導教授: 施國琛
Timothy K. Shih
口試委員:
學位類別: 博士
Doctor
系所名稱: 資訊電機學院 - 資訊工程學系
Department of Computer Science & Information Engineering
論文出版年: 2021
畢業學年度: 109
語文別: 英文
論文頁數: 108
中文關鍵詞: 機器學習順序行為循環神經網絡注意力機制情境意識
外文關鍵詞: Machine learning, Sequential Behavior, Recurrent neural network, Attention mechanism, Context awareness
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  • 過去幾年中,基於深度學習的模型(DL)受到了很多關注,尤其是在順序推薦任務領域。由於其處理複雜數據的能力,當前的順序DL研究工作已經超越了傳統模型,例如基於Markov鍊和基於因子分解的模型。但是,基於順序DL的模型的研究仍有改進的空間。特別是,如何設計有效的DL模型來處理不同場景下的順序推薦任務。在這種情況下,本文通過考慮現有方法的當前局限性,重點研究基於DL的順序推薦系統。具體來說,我們演示了順序推薦過程的概述概念,介紹了相關的最新算法,總結了影響基於DL的模型性能的關鍵因素,提出了用於復雜環境下順序推薦任務的新型基於DL的方法,並進行相應的評估,以顯示我們提出的模型在最新方法上的有效性。最後,我們通過系統地概述當前的挑戰,未來的方向以及我們在該領域的貢獻來結束我們的論文。最後,我們認為我們提出的項目對現有的序列感知推薦工作具有很高的積極貢獻。


    Deep learning based models (DL) have received a lot of attention in the past few years especially with the domain of sequential recommendation tasks. Due to its capability to deal with complex data, currently sequential DL research works have surpassed traditional models such as Markov chain-based and factorization-based models. However, there is a room for improvement on the studies of Sequential DL-based models. Particularly, how to design an effective DL model to handle the sequential recommendation tasks under different scenarios. In this view, this thesis focuses on the DL-based sequential recommender systems by taking the current limitations of existing methods into consideration. Specifically, we demonstrate the overview concept of sequential recommendation processes, present the related state-of-the-art algorithms, summarize the key factors affecting the performance of DL-based models, propose the novel DL-based for sequential recommendation tasks under complex settings, and conduct corresponding evaluations to show the effectiveness of our proposed models over the state-of-the-art methods. We finally conclude our thesis by systematically outlining current challenges, future directions and our contributions in this field. At last, we believe that our proposed project has high positive contributions to the existing sequence-aware recommendation works.

    摘 要 v ABSTRACT vi Authorship Attribution vii Acknowledgements viii Table of Content ix List of Figures xi List of Tables xiii Chapter I Introduction 1 Chapter II Overview of Sequential Recommendation 5 2.1 Concept Definition 5 2.2 Influential Factors on Sequential DL-based Models 6 2.2.1. Input Module 7 2.2.2. Data Pre-Processing 10 2.2.3. Model Structure 13 2.2.4. Model Training 18 2.2.5. Model Evaluation 22 Chapter III Related Work 24 3.1. Traditional POI Recommendation 24 3.2. Deep Learning POI Recommendation 25 3.3. Conventional Recommendation 27 3.4. Sequential Recommendation 28 3.5. Neural Attentive Recommendation 29 3.6. Additional Topics For The Future Works 33 3.7. Our Target Research Directions 34 Chapter VI A Learning-Based POI Recommendation with 39 Spatio-temporal Context-Awareness 39 4.1. Introduction 39 4.2. Preliminary 42 4.3. Proposed Recommendation System: DeNavi 42 1) Feature Extraction and Embedding 43 2) Learning Model and Training 43 DeNavi-LSTM: 44 3) Prediction Module of DeNavi 51 4.4. Performance Evaluation 52 A. Experiment Setup 52 B. ACC@N Performance 55 C. Precision@N, Recall@N and F-measure@N Performance 56 D. The Effectiveness of Time and Distance Transition Contexts 58 E. Scalability Discussion 60 F. Discussion of Parameter Settings 61 G. Interpretability Discussion 63 4.5. Conclusion 66 Chapter VII A Novel Context-aware Recommender System Based on A Deep Sequential Learning Approach (CReS) 67 5.1. Introduction 67 5.2. Preliminaries 71 5.3. The proposed model architecture: CRES 73 5.3.1. Feature Extraction and Input 74 5.3.2. Session Representation 75 5.3.3User Long-Term Preferences 77 5.3.4Top-N Recommendations 78 5.3.5Interpretable Recommendations 79 5.3.6Model Learning 79 5.4. Experimental Setting 80 5.4.1Datasets and Data-Preparation 80 5.4.2 Sequential Implication for Datasets 81 5.4.3 The advantage of CReS over the sequential datasets 83 5.6. Experimental Results 86 5.6.1. Overall Performance (RQ1) 86 5.6.2. Performance on other measures (RQ1) 87 5.6.3. Analysis on Generalization versus Specification of CReS (RQ1) 89 5.6.4. Analysis on Model Components (RQ2) 92 5.6.5. Effects of different hyper-parameter settings on CReS (RQ3) 94 5.6.6. Case Study (RQ4) 97 5.6.7. Discussion of all observations and future work propositions (RQ1-4) 98 5.7. Conclusion 99 Chapter VIII Conclusion 100 References 102

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