博碩士論文 110423062 詳細資訊



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姓名 林鈺融(Lin Yu-Jung)  查詢紙本館藏   畢業系所 資訊管理學系
論文名稱 利用集成式過採樣方法解決諷刺偵測之類別不平衡問題
(Handling Class Imbalanced Data in Sarcasm Detection with Ensemble Oversampling Techniques)
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摘要(中) 隨著近年來社交媒體和 Web 2.0 平台的快速發展，越來越多的使用者在網路上分享他們的想法並交換意見。企業理解公眾輿論以改善決策的需求比以往任何時候都更加迫切。然而，傳統的情感分析卻無法準確識別諷刺，其中類別不平衡是一個主要問題，為了解決諷刺偵測中的類別不平衡的問題，本研究提出了六種集成過採樣方法（SEO）來有效發揮不同過採樣演算法的優勢。透過將集成學習的概念應用於過採樣技術，所提出的方法 – random、center、uncentered、cluster random、cluster center和cluster uncentered - 為新生成的諷刺資料提供了不同的選擇方法。在本研究中，採用了SMOTE、ADASYN、polynom-fit-SMOTE、ProWSyn和SMOTE-IPF作為實驗中使用的過採樣演算法，並且使用從Twitter和Reddit收集的兩個類別不平衡的諷刺偵測資料集（即iSarcasmEval和SARC-reduced），將文本經過Word2Vec、GloVe、FastText萃取特徵後進行過採樣與集成，以五個分類器 - 支持向量機、決策樹、隨機森林、極限梯度提升和邏輯斯回歸的分類結果對SEO的性能進行評估。實驗結果顯示，SEO在iSarcasmEval的AUC指標上比起單一過採樣演算法高出了7%，在F1-score上則高出了2%。而SARC-reduced，SEO比起單一演算法在AUC指標有著1.5%的提升，在F1-score則有著1% 的提升。
摘要(英) With the fast growing of social media and web 2.0 platform in recent years, people increasingly share their thoughts and exchange their opinions on the internet. The need for enterprise to understand the public opinion to improve their decision making is greater than ever. However, conventional sentiment analysis fails to accurately identify sarcasm, and class imbalance poses a major challenge in sarcasm detection. In order to handle the class imbalance problem in sarcasm detection, this study proposes six ensemble oversampling methods (SEO) that effectively exploit the advantages of various oversampling algorithms. By applying the concept of ensemble learning to oversampling techniques, the proposed methods - random, center, uncentered, cluster random, cluster center, and cluster uncentered - offer distinct selection approaches for the newly produced sarcastic data. In this study, SMOTE, ADASYN, polynom-fit-SMOTE, ProWSyn, SMOTE_IPF are adopted for the oversampling algorithms in the experiment. Furthermore, two imbalanced sarcasm detection datasets, iSarcasmEval and SARC-reduced, collected from Twitter and Reddit, are utilized. After extracting features from the text using Word2Vec, GloVe, and FastText, oversampling and ensemble techniques are applied. The performance of SEO is evaluated using five classifiers - Support Vector Machine, Decision Tree, Random Forest, Extreme Gradient Boosting, and Logistic Regression - based on the classification results. The results shows that the proposed method outperform single oversampling algorithm method by 7% for AUC metric and 2% for F1-score for iSarcasmEval. While the improvement is 1.5% for AUC metric and 1% for F1-score for SARC-reduced.
關鍵字(中) ★ 諷刺偵測
★ 類別不平衡
★ 過採樣
★ 集成式學習		 關鍵字(英) ★ Sarcasm detection
★ Class imbalance
★ Oversampling
★ Ensemble learning
論文目次 1 Introduction 1
1.1 Background 1
1.2 Motivation 2
1.3 Objective 3
1.4 Organization 3
2 Literature Review 4
2.1 Class Imbalance 4
2.1.1 Data level 4
2.1.2 Algorithm level 5
2.2 Sarcasm Detection 6
2.3 Ensemble Learning 9
3 Methodology 12
3.1 Data Preprocessing 12
3.2 Feature Extraction 13
3.2.1 Word2Vec 13
3.2.2 FastText 14
3.2.3 GloVe 15
3.3 Oversampling Algorithms 15
3.3.1 SMOTE 16
3.3.2 ADASYN 16
3.3.3 Polynom-fit-SMOTE 16
3.3.4 ProWSyn 17
3.3.5 SMOTE-IPF 17
3.4 Ensemble Methods 18
3.5 Classification Techniques 22
4 Experimental Setup and Evaluation 24
4.1 Datasets 24
4.2 Experimental Process 25
4.3 Experimental Setup 26
4.4 Evaluation Metrics 26
5 Experimental Results 28
5.1 iSarcasmEval 28
5.1.1 Experiment 1 Single Oversampling Algorithm 28
5.1.2 Experiment 2 Single Oversampling Algorithm vs. SEO 32
5.2 SARC-reduced 33
5.2.1 Experiment 1 Single Oversampling Algorithm 33
5.2.2 Experiment 2 Single Oversampling Algorithm vs. SEO 37
5.3 Discussion 38
5.3.1 iSarcasmEval 38
5.3.2 SARC-reduced 41
5.3.3 Overall Discussion 45
6 Conclusion 47
6.1 Experimental Findings and Contribution 47
6.2 Limitations and Future Directions 48
References 50
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指導教授 胡雅涵 周惠文 審核日期 2023-7-24
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