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題名 雲端運算服務環境下運用文字探勘於語意註解網頁文件分析之研究
Extraction of semantic annotation document using text mining techniques in cloud computing environment
作者 黃孝文
貢獻者 楊建民
黃孝文
關鍵詞 雲端運算
文件分類
語意註解
簡單貝氏分類器
日期 2009
上傳時間 11-Oct-2011 16:50:28 (UTC+8)
摘要 隨著網路的快速成長,資料探勘(Data Mining)及文字探勘(Text Mining)所須分析的資料集越來越龐大,透過單一機器執行資料探勘分析受限於記憶體大小及其計算能力,不僅運算時間大幅增加,分析資料集的檔案大小也因而受到限制;語意註解萃取出文件的重要內容,凸顯主題加強資料探勘及文字探勘的效果,而資料探勘、文字探勘和語意註解背後都牽涉到大規模的資料處理,透過雲端運算的技術使負載平衡,將運算工作分散至運算叢集中的每一台電腦,不僅加快運算和儲存的速度,更可降低整體的風險。
本研究使用Hadoop軟體實作雲端文字探勘平台,用於分散式文字探勘及結果分析,採用涵蓋21578篇新聞文件的路透社資料集(Reuters 21578)進行實證分析,依照Mod Apte切分法分為訓練資料集及測試資料集用以進行文件分類,文件分類的步驟分為數個部分,分別為進行資料格式轉換的資料前置處理、針對文件內容加註更詳盡的連結及描述的語意註解、用以產生分類預測模型的分類器(簡單貝氏分類器、餘集簡單貝氏分類器)與評估文件分類結果的評估器;路透社資料集經過去除停用字、附加語意註解資料及文本詞彙長度統計分類,再進行簡單貝氏分類器及餘集簡單貝氏分類器的訓練,比較測試資料集的分類正確率作為文件分類實證結果。
本研究根據實驗結果發現,探討去除停用字、語意註解、文件分類演算法及文本詞彙長度對於文件分類正確率的影響:(1)去除停用字使出現頻率高的停用字對於分類預測產生負面影響;(2)語意註解作為詮釋資料的取得方式,可增加文件分類的效果;(3)餘集簡單貝氏分類器,可用以減少偏斜資料對於分類預測結果的誤判;(4)文本詞彙長度較長的文章則會某種程度主導分類預測結果,造成誤判的產生,降低分類正確率;透過上述各影響因子的調整使文件分類的結果得到改善,使得文件分類正確率獲得較佳的效果。
本研究提出之系統以雲端運算環境運行文件分類演算法,使得大型資料集得以更為迅速取得分析結果,使用語意註解作為詮釋資料的來源,使得文件分類模型產生過程中有更多資訊可分析,使得機器判斷的正確程度獲得改善,亦可將文件轉換為語意網文件,供語意網搜尋引擎查詢檢索,未來應加入Twitter或Facebook等擁有大量非結構化資料的網站之資料,使本平台得以分析更大規模的資料,並且考慮資料集類別分佈的集中程度對分類正確率的影響程度,同時應實作效果更佳的分類演算法,進而改善系統整體的結果。
Nowadays, businesses perform data mining and text mining need to handle large scale dataset. The computational resources of servers are often limited and lack of efficient to compute analytical jobs. But if they could run their data mining jobs under cloud computing clusters, they are able to get results very quickly on a large dataset without "out of memory" problems.
In this paper, a series of experiments are conducted to measure and analyze the accuracy of the classification algorithms implemented on Hadoop using Reuters-21578 dataset; the process of text mining consisted of four stages: (1)data preprocessing, (2)semantic annotation, (3)classifier, (4)evaluator. Reuters-21578 had divided into training set and testing set based on Mod Apte Split, processed by stopwords removal, appended semantic annotations as metadata and splitted into several subsets according to different document sizes. Experiments outlined several issues that will need to be considered when conducting text mining.
According to the experiment results, the researcher found that stopwords removal, semantic annotation, different classification algorithms and different document sizes could improve the classification accuracy. First, stopwords removal avoids common words from becoming noises that will do harm to classification result. Second, semantic annotation as the extra information could improve the result. Third, complementary naive bayes algorithm could solve the decision boundary problem which naive bayesian cannot handle. Fourth, long documents could dominate the classification results. Sixth, the class imbalance problem could cause a drop of classification accuracy. Text mining result could be improved by adjusting the parameters found above.
參考文獻 [1] Apte, C., Damerau, F., & Weiss, S. M. (1994). Towards language independent automated learning of text categorization models. Paper presented at the ACM SIGIR Conference on Research and Development in Information Retrieval.
[2] AWS in Education. (2010). from http://aws.amazon.com/education
[3] Berendt, B., Hotho, A., & Stumme, G. (2002). Towards semantic web mining. The Semantic Web—ISWC 2002, 264-278.
[4] Center, N. R. (2008). DisCo. from http://discoproject.org/
[5] Chang, F., Dean, J., Ghemawat, S., Hsieh, W. C., Wallach, D. A., Burrows, M., et al. (2008). Bigtable: A distributed storage system for structured data. ACM Transactions on Computer Systems (TOCS), 26(2), 4.
[6] Chu, C. T., Kim, S. K., Lin, Y. A., Yu, Y. Y., Bradski, G., Ng, A. Y., et al. (2007). Map-reduce for machine learning on multicore. Paper presented at the NIPS.
[7] Dean, J., & Ghemawat, S. (2008). MapReduce: Simplified data processing on large clusters. Communications of the ACM, 51(1), 107-113.
[8] Dlugolinsky, S., Laclavik, M., Seleng, M. (2010). Ontea Semantic Annotation. from http://ontea.sourceforge.net/
[9] Fayyad, U., Piatetsky-Shapiro, G., & Smyth, P. (1996). The KDD process for extracting useful knowledge from volumes of data. Communications of the ACM, 39(11), 27-34.
[10] Foundation, A. S. (2008). Cassandra. from http://incubator.apache.org/cassandra/
[11] Foundation, A. S. (2008). Hadoop. from http://hadoop.apache.org/core/
[12] Foundation, A. S. (2010). Hbase. from http://hadoop.apache.org/hbase/
[13] Gillick, D., Faria, A., & DeNero, J. (2006). Mapreduce: Distributed computing for machine learning.
[14] Google. (2010). Google App Engine. from http://code.google.com/intl/en/appengine
[15] Hypertable. (2010). Hypertable. from http://www.hypertable.org
[16] Jenkin, N. (2009). COMP390-09A Report Distributed Machine Learning with Hadoop.
[17] Kibriya, A., Frank, E., Pfahringer, B., & Holmes, G. (2005). Multinomial naive bayes for text categorization revisited. AI 2004: Advances in Artificial Intelligence, 235-252.
[18] Laclavik, M., eleng, M., & Hluchy, L. (2008). Towards large scale semantic annotation built on mapreduce architecture. Computational Science–ICCS 2008, 331-338.
[19] Laclavik, M., Seleng, M., Gatial, E., Balogh, Z., & Hluchy, L. (2007). Ontology based Text Annotation–OnTeA. Information modelling and knowledge bases XVIII, 311.
[20] Lioma, C., Moens, M. F., & Azzopardi, L. (2008). Collaborative annotation for pseudo relevance feedback. ESAIR, 11, 25-35.
[21] Maedche, A. (2001). Ontology learning for the semantic web: Intelligent Systems, IEEE.
[22] Mell, P., & Grance, T. (2009). The nist definition of cloud computing. National Institute of Standards and Technology.
[23] Ontotext. (2009). KIM Semantic Annotation. from http://www.ontotext.com/kim/introduction.html
[24] Papadimitriou, S., & Sun, J. (2008). Disco: Distributed co-clustering with Map-Reduce: A case study towards petabyte-scale end-to-end mining. Paper presented at the ICDM.
[25] ReadWriteWeb. (2010). Does Facebook Really Want a Semantic Web? , from http://www.readwriteweb.com/archives/does_facebook_really_want_a_semantic_web.php
[26] Reeve, L., & Han, H. (2005). Survey of semantic annotation platforms. Paper presented at the Proceedings of the 2005 ACM symposium on Applied computing.
[27] RIGHTSCALE. (2010). RIGHTSCALE. from http://www.rightscale.com/index.php
[28] Sivashanmugam, K., Sheth, A., Miller, J., Verma, K., Aggarwal, R., & Rajasekaran, P. (2003). Metadata and semantics for Web services and processes. Datenbanken und Informationssysteme: Festschrift zum, 60, 245-271.
[29] Stanford. (2005). TAP. from http://ksl.stanford.edu/projects/TAP/
[30] Stanford. (2007). Phoenix. from http://csl.stanford.edu/~christos/sw/phoenix/
[31] Wegener, D., Mock, M., Adranale, D., & Wrobel, S. (2009). Toolkit-based high-performance data mining of large data on MapReduce clusters.
[32] Wikipedia. (2007). Dbpedia. from http://wiki.dbpedia.org/
[33] Wikipedia. (2010). Cloud Computing. from http://en.wikipedia.org/wiki/Cloud_computing
[34] Witten, I. H., & Frank, E. (2005). Data Mining: Practical machine learning tools and techniques: Morgan Kaufmann Pub.
[35] gipi的學習筆記,2009,http://www.dotblogs.com.tw/jimmyyu/。
[36] 劉繼鴻,2009,影音Web 2.0平台網站上行銷傳播之社會網絡與資料探勘分析研究-以YouTube-Mac網絡為例,國立政治大學資訊管理研究所碩士論文。
[37] 劉俊宏,2009,雲端運算環境下學習社群服務導向架構平台之研究,國立政治大學資訊管理研究所碩士論文。
[38] 王耀聰、陳威宇,2008,雲端運算簡介,http://bit.ly/bXsTVT。
[39] 謝良奇,2008,HP、Intel、Yahoo共組開放源碼雲端運算計畫,http://bit.ly/adLC7D。
[40] 葉慶隆,2009,Semantic Web and Knowledge Management, http://www.deg.byu.edu/ding/research/SemanticAnnotation.html。
[41] 陳瀅,2010,雲端策略:雲端運算與虛擬化技術,天下雜誌。
描述 碩士
國立政治大學
資訊管理研究所
97356012
98
資料來源 http://thesis.lib.nccu.edu.tw/record/#G0097356012
資料類型 thesis
dc.contributor.advisor 楊建民zh_TW
dc.contributor.author (Authors) 黃孝文zh_TW
dc.creator (作者) 黃孝文zh_TW
dc.date (日期) 2009en_US
dc.date.accessioned 11-Oct-2011 16:50:28 (UTC+8)-
dc.date.available 11-Oct-2011 16:50:28 (UTC+8)-
dc.date.issued (上傳時間) 11-Oct-2011 16:50:28 (UTC+8)-
dc.identifier (Other Identifiers) G0097356012en_US
dc.identifier.uri (URI) http://nccur.lib.nccu.edu.tw/handle/140.119/51559-
dc.description (描述) 碩士zh_TW
dc.description (描述) 國立政治大學zh_TW
dc.description (描述) 資訊管理研究所zh_TW
dc.description (描述) 97356012zh_TW
dc.description (描述) 98zh_TW
dc.description.abstract (摘要) 隨著網路的快速成長,資料探勘(Data Mining)及文字探勘(Text Mining)所須分析的資料集越來越龐大,透過單一機器執行資料探勘分析受限於記憶體大小及其計算能力,不僅運算時間大幅增加,分析資料集的檔案大小也因而受到限制;語意註解萃取出文件的重要內容,凸顯主題加強資料探勘及文字探勘的效果,而資料探勘、文字探勘和語意註解背後都牽涉到大規模的資料處理,透過雲端運算的技術使負載平衡,將運算工作分散至運算叢集中的每一台電腦,不僅加快運算和儲存的速度,更可降低整體的風險。
本研究使用Hadoop軟體實作雲端文字探勘平台,用於分散式文字探勘及結果分析,採用涵蓋21578篇新聞文件的路透社資料集(Reuters 21578)進行實證分析,依照Mod Apte切分法分為訓練資料集及測試資料集用以進行文件分類,文件分類的步驟分為數個部分,分別為進行資料格式轉換的資料前置處理、針對文件內容加註更詳盡的連結及描述的語意註解、用以產生分類預測模型的分類器(簡單貝氏分類器、餘集簡單貝氏分類器)與評估文件分類結果的評估器;路透社資料集經過去除停用字、附加語意註解資料及文本詞彙長度統計分類,再進行簡單貝氏分類器及餘集簡單貝氏分類器的訓練,比較測試資料集的分類正確率作為文件分類實證結果。
本研究根據實驗結果發現,探討去除停用字、語意註解、文件分類演算法及文本詞彙長度對於文件分類正確率的影響:(1)去除停用字使出現頻率高的停用字對於分類預測產生負面影響;(2)語意註解作為詮釋資料的取得方式,可增加文件分類的效果;(3)餘集簡單貝氏分類器,可用以減少偏斜資料對於分類預測結果的誤判;(4)文本詞彙長度較長的文章則會某種程度主導分類預測結果,造成誤判的產生,降低分類正確率;透過上述各影響因子的調整使文件分類的結果得到改善,使得文件分類正確率獲得較佳的效果。
本研究提出之系統以雲端運算環境運行文件分類演算法,使得大型資料集得以更為迅速取得分析結果,使用語意註解作為詮釋資料的來源,使得文件分類模型產生過程中有更多資訊可分析,使得機器判斷的正確程度獲得改善,亦可將文件轉換為語意網文件,供語意網搜尋引擎查詢檢索,未來應加入Twitter或Facebook等擁有大量非結構化資料的網站之資料,使本平台得以分析更大規模的資料,並且考慮資料集類別分佈的集中程度對分類正確率的影響程度,同時應實作效果更佳的分類演算法,進而改善系統整體的結果。
zh_TW
dc.description.abstract (摘要) Nowadays, businesses perform data mining and text mining need to handle large scale dataset. The computational resources of servers are often limited and lack of efficient to compute analytical jobs. But if they could run their data mining jobs under cloud computing clusters, they are able to get results very quickly on a large dataset without "out of memory" problems.
In this paper, a series of experiments are conducted to measure and analyze the accuracy of the classification algorithms implemented on Hadoop using Reuters-21578 dataset; the process of text mining consisted of four stages: (1)data preprocessing, (2)semantic annotation, (3)classifier, (4)evaluator. Reuters-21578 had divided into training set and testing set based on Mod Apte Split, processed by stopwords removal, appended semantic annotations as metadata and splitted into several subsets according to different document sizes. Experiments outlined several issues that will need to be considered when conducting text mining.
According to the experiment results, the researcher found that stopwords removal, semantic annotation, different classification algorithms and different document sizes could improve the classification accuracy. First, stopwords removal avoids common words from becoming noises that will do harm to classification result. Second, semantic annotation as the extra information could improve the result. Third, complementary naive bayes algorithm could solve the decision boundary problem which naive bayesian cannot handle. Fourth, long documents could dominate the classification results. Sixth, the class imbalance problem could cause a drop of classification accuracy. Text mining result could be improved by adjusting the parameters found above.
en_US
dc.description.tableofcontents 誌 謝 I
摘 要 II
目 錄 IV
圖索引 VI
表索引 VII
第一章 緒論 1
第一節 研究背景 1
第二節 研究動機 2
第三節 研究目的 3
第四節 研究架構 4
第二章 文獻探討 5
第一節 資料探勘與文字探勘 5
2.1.1資料探勘 5
2.1.2文字探勘 7
2.1.3資料探勘與文字探勘之差異 7
2.1.4簡單貝氏分類器 9
第二節 雲端運算 10
2.2.1雲端運算的定義 10
2.2.2現有的雲端運算服務 16
第三節 MapReduce軟體設計模型 16
2.3.1 Google的分散式資料庫BigTable 18
2.3.2 MapReduce軟體設計模型應用於資料探勘之研究 20
第四節 實作MapReduce架構的框架 20
2.4.1 Hadoop 21
2.4.2 DisCo 22
2.4.3使用雲端運算平台的其他方案 23
第五節 現今語意網的相關發展 24
2.5.1鍊結資料(Linked Data) 24
2.5.2 Facebook 25
2.5.3 Wolfram Alpha 27
第六節 語意註解(Semantic Annotation) 28
2.6.1語意註解的分類 30
2.6.2語意註解的發展 31
2.6.3語意註解於資料探勘上的應用 31
第三章 研究方法 32
第一節 研究設計 33
第二節 文本資料集Reuters 21578 35




3.2.1路透社資料集文件格式 35
3.2.2路透社資料集的歪斜資料特性 37
第三節 資料前置處理 39
3.3.1斷詞切字(Tokenization) 39
3.3.2去除停用字(Stop Words Removal) 39
3.3.3詞幹還原(Stemming) 40
第四節 語意註解 41
第五節 分類器(Classifier) 43
3.4.1簡單貝氏分類器 43
3.4.2餘集簡單貝氏分類器 45
3.4.3簡單貝氏分類器與餘集簡單貝氏分類器的實作 45
第六節 評估器(Evaluator) 46
第七節 平台建置 46
第四章 研究成果 48
第一節 去除停用字對文件分類正確率的影響 48
第二節 語意註解對文件分類正確率的影響 50
第三節 比較簡單貝氏分類器與餘集簡單貝氏分類器之分類正確率 51
第四節 餘集簡單貝氏分類器消除偏斜資料產生的決策邊界問題之效果 52
第五節 文本詞彙長度對文件分類正確率的影響 53
第六節 避免模型過適問題 54
第七節 類別分佈均勻程度對於分類結果之影響 56
第八節 各階段實驗結論整理 57
第五章 結論與建議 60
第一節 結論 60
第二節 未來研究方向 61
參考文獻 62
zh_TW
dc.language.iso en_US-
dc.source.uri (資料來源) http://thesis.lib.nccu.edu.tw/record/#G0097356012en_US
dc.subject (關鍵詞) 雲端運算zh_TW
dc.subject (關鍵詞) 文件分類zh_TW
dc.subject (關鍵詞) 語意註解zh_TW
dc.subject (關鍵詞) 簡單貝氏分類器zh_TW
dc.title (題名) 雲端運算服務環境下運用文字探勘於語意註解網頁文件分析之研究zh_TW
dc.title (題名) Extraction of semantic annotation document using text mining techniques in cloud computing environmenten_US
dc.type (資料類型) thesisen
dc.relation.reference (參考文獻) [1] Apte, C., Damerau, F., & Weiss, S. M. (1994). Towards language independent automated learning of text categorization models. Paper presented at the ACM SIGIR Conference on Research and Development in Information Retrieval.zh_TW
dc.relation.reference (參考文獻) [2] AWS in Education. (2010). from http://aws.amazon.com/educationzh_TW
dc.relation.reference (參考文獻) [3] Berendt, B., Hotho, A., & Stumme, G. (2002). Towards semantic web mining. The Semantic Web—ISWC 2002, 264-278.zh_TW
dc.relation.reference (參考文獻) [4] Center, N. R. (2008). DisCo. from http://discoproject.org/zh_TW
dc.relation.reference (參考文獻) [5] Chang, F., Dean, J., Ghemawat, S., Hsieh, W. C., Wallach, D. A., Burrows, M., et al. (2008). Bigtable: A distributed storage system for structured data. ACM Transactions on Computer Systems (TOCS), 26(2), 4.zh_TW
dc.relation.reference (參考文獻) [6] Chu, C. T., Kim, S. K., Lin, Y. A., Yu, Y. Y., Bradski, G., Ng, A. Y., et al. (2007). Map-reduce for machine learning on multicore. Paper presented at the NIPS.zh_TW
dc.relation.reference (參考文獻) [7] Dean, J., & Ghemawat, S. (2008). MapReduce: Simplified data processing on large clusters. Communications of the ACM, 51(1), 107-113.zh_TW
dc.relation.reference (參考文獻) [8] Dlugolinsky, S., Laclavik, M., Seleng, M. (2010). Ontea Semantic Annotation. from http://ontea.sourceforge.net/zh_TW
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