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系統識別號 U0026-1406202000174300
論文名稱(中文) 二階段式分類技術處理不平衡情感資料
論文名稱(英文) A Novel Classification Method Based on a Two-Phase Technique for Learning Imbalanced Text Data
校院名稱 成功大學
系所名稱(中) 資訊管理研究所
系所名稱(英) Institute of Information Management
學年度 108
學期 2
出版年 109
研究生(中文) 徐文彥
研究生(英文) Wen-Yen Hsu
學號 R76071058
學位類別 碩士
語文別 中文
論文頁數 63頁
口試委員 指導教授-利德江
口試委員-張哲榮
口試委員-蔡東亦
口試委員-林耀三
中文關鍵字 不平衡資料  情感分析  SVM 
英文關鍵字 Imbalanced Data  Sentiment Analysis  Support Vector Machine 
學科別分類
中文摘要 現今網路科技以及電腦資訊的磅礡發展下,講求高效率運作與提升精準度已成為目前技術發展的目標,而數據處理為這一切發展的根基,在大數據文化的迫使下,數據不再像之前一樣單純,而是參雜著錯綜複雜的資訊使得現今機器學習或是深度學習上分析精準度以及效能受到不小的影響,再加上文字數據本身的複雜度,以及不平衡資料的問題提高,時常導致分類器在學習的過程當中,對小類別資料(Minority class)時常誤分類為大類別資料(Majority class),使結果有著顯著的偏差。小類別的資料通常數量少而具有重要的意義,因此,如何在類別比例懸殊的文字資料集進行資料分析是一個實務上的挑戰和議題。隨機抽樣(Random Sampling)是處理不平衡資料集的手段之一,該方法分為兩種,一為過抽樣(Oversampling),二為欠抽樣(Undersampling),過抽樣指的是針對小類別樣本進行隨機複製,來增加其樣本數,而欠抽樣則是針對大類別樣本進行隨機刪減,兩者的目的都是為了降低不平衡比例,但這種方法在情感分析的情境下,可能會導致訓練時產生過擬合(Overfitting)和訊息缺失的問題。本研究為了解決該問題,提出二階段平衡分類法,目的為讓學習模型之建立在資料量平衡的情境下來找出理想的分類情況。方法之第一階段透過成本敏感度支持向量機(Cost-sensitive support vector machine , CS-SVM),找出不平衡比例低的資料集,而在第二階段使用支持向量機(Support Vector Machine, SVM),將第一階段產出的平衡資料集進行分類,並依據分類結果以基因演算法(Genetic Algorithm , GA)來處理SVM中誤分類懲罰成本C和篩選核函數中的參數Γ。
英文摘要 Imbalanced data has a heavy impact on the performance of models. In the case of imbalanced text datasets, minority class data are often classified to the majority class, resulting in a loss of the minority information and low accuracy. Thus, it is a serious challenge to determine how to tackle high imbalance ratio distribution of datasets. In our project, a two-phase classification is carried out aimed toward a text data learning model without distribution skewness, where the model adjusts to the optimal condition. There are two core stages in the proposed method: In stage one, the aim of stage is to create balanced dataset, and in stage two, the balanced dataset is classified using a symmetric cost-sensitive support vector machine. We also adjust the learning parameters in both stages with a genetic algorithm in order to create the optimal model. The Yelp review datasets are used in this study to validate the effectiveness of the proposed method. In addition, four criteria are used to evaluate and compare the performance of the proposed method and the other well-known algorithms: Accuracy, F-measure, Adjusted G-mean, and AUC. The experimental results reveal that the new method can significantly improve the learning approach.
論文目次 目錄
摘要 II
表目錄 XV
圖目錄 XVI
第一章 緒論 1
1.1研究背景 1
1.2研究動機 4
1.3研究目的 6
1.4研究架構 7
第二章 文獻探討 9
2.1資料不平衡學習問題之回顧 9
2.1.1資料不平衡之探討 9
2.1.2不平衡情感分析之探討 11
2.2隨機抽樣方法之回顧 13
2.2.1過抽樣之探討 13
2.2.2欠抽樣之探討 16
2.3文字嵌入與特徵萃取之回顧 17
2.3.1文字嵌入之探討 18
2.3.2特徵萃取之探討 20
2.4 SVM演算法之回顧 22
2.5小結 25
第三章 研究方法 27
3.1文字資料前處理 27
3.2特徵字詞向量化 28
3.3二階段模型分類法 30
3.3.1第一階段 31
3.3.2第二階段 33
3.3.3階段參數調整 34
3.4研究方法流程 36
第四章 實例驗證 38
4.1實驗環境 38
4.1.1實驗方式 38
4.1.2實驗評估指標 39
4.1.3實驗資料 41
4.1.4實驗建構軟體 42
4.2實驗結果 44
4.2.1實驗結果表 45
4.2.2 Yelp_α資料集及實驗結果 47
4.2.3 Yelp_β資料集及實驗結果 49
4.2.4 Yelp_γ資料集及實驗結果 52
第五章 結論與建議 56
5.1結論 56
5.2未來建議 57
參考文獻 58

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