資料淨化於類別不平衡問題: 機器學習觀點

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蔡武霖(WU-LIN TSAI) 查詢紙本館藏

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論文名稱

資料淨化於類別不平衡問題: 機器學習觀點

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摘要(中)

機器學習在Google Alpha Go出現之後再次受到矚目，這也顯現出收集資料的重要性。但在現實生活中，資料收集時的困難與限制會造成收集資料的不平均。這容易使得分類困難與不準確，因為特徵選取與不平衡處理(抽樣)後，影響分類器在向量空間中的學習與分類效能。本研究使用知名公開網站的資料集，並設計二個流程來發掘類別不平衡問題，而特徵選取與抽樣誰該放置於前或後，使用五種不平衡處理抽樣模組，分別為三增加少數抽樣法、二減少多數抽樣法放置於前後，另外特徵選取使用二種模組，並加入有無正規化在這二項流程上。分類器目前在類別不平衡中，最常被使用支持向量機(SVM)與決策樹(Decision Tree Classifier)的二種分類器進行分類。從本研究實驗過程得知，類別不平衡資料在先執行特徵選取之後，再執行不平衡處理(抽樣)，低資料量在抽樣後為 SMOTE 增加少數抽樣法，高資料量在抽樣後Random為減少多數抽樣法(Under Sampling)，特徵選取小於20建議使用PCA，20維以上使用GA，分類器SVM 為佳的分類器，至於資料是否要正規化為決策樹不使用、支持向量機使用。

摘要(英)

After the invention of Alpha Go, machine learning caught the public eye and showed us the essential need for data collection. Nevertheless, in reality, data collection is often uneven owing to its many difficulties and confinement. Feature selection and imbalanced (Sampling) have inherent impacts on Classifier in vector space. This in turn impacts the ability of learning and classification which also leads to difficulty and inaccuracy during data classification. This research aims to utilize data from public websites to design two processes to excavate imbalanced (Sampling), feature selection and place sampling in the beginning and at the end. It will utilize five examples of imbalanced (sampling); three examples of increased over sampling and two of reduced under sampling placed in the beginning and the back. Moreover, it will use two different models and utilize normalization with non-normalization in the two processes. Classifier in class imbalanced is often used to support vector machines and decision trees two model. From this research, we can find out that class imbalanced need use after then use feature selection, SMOTE is when low data amounts after sampling increase over sampling. Random is when high data amounts after sampling reduce under sampling. It is recommended to use PCA when feature selection is under 20 dimensions, as GA is recommended if feature selection is above 20 dimensions. Moreover, the ideal classifier is SVM. When it comes to the question of utilizing normalization in data, we can utilize classification to selection. decision tree abandons it. support vector machines use it.

關鍵字(中)

★ 機器學習
★ 資料探勘
★ 類別不平衡
★ 抽樣
★ 特徵選取

關鍵字(英)

★ Machine Learning
★ Data Mining
★ Class Imbalanced Problem
★ Sampling
★ Feature Selection

論文目次

中文摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VI
圖目錄 VIII
第一章緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 研究目的 3
1.4 研究貢獻 3
1.5 論文架構 4
第二章文獻探討 6
2.1 資料前處理 6
2.2 特徵選取(Feature selection) 7
2.2.1 監督式學習 7
2.2.2 遺傳演算法(Genetic Algorithm GA) 8
2.2.3 非監督式學習 10
2.2.4 主成分分析PCA 11
2.3 類別不平衡Class Imbalance 12
2.3.1 增加少數抽樣法Over Sampling 12
2.3.2 SMOTE 13
2.3.3 SMOTE Borderline 14
2.3.4 ANDANY 16
2.3.5 減少多數抽樣法Under Sampling 18
2.3.6 Random under Sampling 19
2.3.7 Edited Nearest Neighbours 20
2.4 支持向量機SVM 21
2.5 決策樹Decision Tree Classifier 22
2.6 正規化 24
2.7 近期學者研究資料 26
第三章研究方法 28
3.1 研究架構 28
3.1.1 研究架構流程 30
3.2 資料收集與前處理 32
3.2.1 資料收集 33
3.2.2 資料前處理與流程 34
3.3 特徵選取模型與種類 35
3.3.1 特徵選取流程 36
3.4 不平衡資料處理模型與種類 37
3.5 分類模型與種類 39
3.6 評估方法 41
3.6.1 混亂矩陣(Confusion Matrix) 41
3.6.2 ROC曲線下面積AUC 43
3.7 小結 44
第四章系統建置與實驗 45
4.1 實驗環境 46
4.2 實驗設計 47
4.2.1 模型參數設定 49
4.3 實驗結果分析 50
4.3.1 Feature Selection VS Imbalanced 51
4.3.2 Over Sampling VS Under Sampling: 54
4.3.3 PCA VS GA 56
4.3.4 Normalization VS Non Normalization: 59
第五章結論 71
5.1 研究總結 71
5.2 研究建議與未來研究方向 72
參考文獻 73
附錄 81

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指導教授

蔡志豐(Chih-Fong Tsai)

審核日期

2019-7-3

推文