臺灣博碩士論文加值系統

本研究的目標在發展一個整合型的資料分群方法來解決一種常見的限制分群問題（constrained clustering problem）, 完整必連（Complete Must-Link, CML）限制問題。限制分群法屬於半監督學習方法（semi-supervised learning），它著重於當資料之間的群組關係為已知時，如何根據其形成的限制來增進分群分析的效率及正確性。完整必連（Complete Must-Link, CML）限制指得是當所有的資料均事先隸屬於一個特定次群集，此一CML限制會強制資料分群時，需將相同的CML群集歸於同群。當使用傳統的限制分群法來處理CML限制問題時，因CML次群資料會被其質量中心點所取代而導致資訊遺失的問題。此一問題在次群集資料相互重疊時更顯得嚴重。本研究提出一個新的分群方法來改善限制分群方法。首先，我們提出一個衡量CML次群集重疊程度的方法（overlapped ratio）。當CML次群集重疊程度高時，考慮在相似矩陣中加入能代表各個資料群集特性的主成份分數。並以此相似矩陣，運用傳統的分群方法重新找出分群結果。此研究以電腦模擬及實際收集的數據將被用來分析新分群法的效能。實驗結果證實所提出的方法能有效解決CML限制資料分群時的資料遺失問題並取得較佳的分群結果。

This research aims to develop an integrated method to solve a special but not uncommon constrained clustering problem constructed by Complete Must-Link (CML) constraints. Constrained clustering analysis is a semi-supervised learning to accommodate the information while it is available, to improve efficiency and purity of clustering. CML clustering problem can be considered as aggregating pre-defined data groups. Through the transitive closure process of data aggregation, the data of each group is replaced by their centroid for clustering analysis. This causes information missing issue which means the data distribution or shape of original group is omitted, especially when the group is overlapped with each other. In this research, in order to overcome this problem, a new method named PCA-CML is proposed for CML constrained clustering problem. The principal component analysis (PCA) which provides the supplemental information describing original partition blocks is suggested to be included in the distance matrix of the constrained clustering algorithm if they are overlapped each other. Overlapped ratio is invented to determine whether CML data partitions are overlapped or not. We test the proposed algorithm using the simulated dataset that consists of overlapped and non-overlapped dataset, and real-world dataset containing cartridge quality information. From the experimental result, we can conclude that the proposed algorithm can alleviate missing information issue in CML constrained clustering when pre-defined CML partitions are overlapped.

Table 1. Comparison of clustering algorithms 12
Table 2. Covariance Matrix 3 Dimensional 17
Table 3. Notation of Overlapped Ratio 23
Table 4. Experiment Result Non-overlapped dataset 36
Table 5. Experiment Result Overlapped dataset 38
Table 6. Experiment Result Cartridge dataset 42
Table 7. Experimental Result of Yeast dataset 44
Table 8. CML Information: 45
Table 9. Experimental Result of Auto MPG dataset 46

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