K-boyutlu ağaç ve uyarlanabilir yarıçap (KD-AR Stream) tabanlı gerçek zamanlı akan veri kümeleme

Öz

Akan veri kümeleme, teknolojik gelişmelere paralel olarak veri miktarının inanılmaz boyutlara ulaştığı gümünüzün popüler konularından biridir. Akan veri kümeleme yaklaşımlarında karşılaşılan en önemli problemler çoğu yaklaşımın çevrimiçi ve çevrimdışı evreden oluşması, küme sayısını tanımlama veya bu sayıya bir sınır koyma zorunluluğu, en doğru yarıçap değerini belirlemede yaşanan problemler ve önerilen modellerin kendisini gelen yeni verilere adapte etmesinde (concept evolution)  yaşanan problemlerdir. Bu problemlerin yanında, neredeyse bu alandaki bütün çalışmaların sayısal miktar tabanlı bir özetleme yapması da bazı uygulamalar için ihtiyacı karşılamamaktadır. Oysa son 1 saniyede veya son 1 saatte gelen veriler şeklinde çalışan zaman tabanlı bir özetleme yaklaşımına da ihtiyaç vardır. Bu çalışmada, K-boyutlu ağaç, uyarlanabilir yarıçap tabanlı (KD-AR Stream) ve kümeleme adaptasyonu özelliğine sahip gerçek zamanlı akan verileri kümeleyen bir yaklaşım önerilmektedir. Önerdiğimiz yöntem SE-Stream, DPStream ve CEDAS algoritmaları ile hem kümeleme başarısı hem de işlem performansı açısından karşılaştırılmıştır. Elde edilen sonuçlar KD-AR Stream algoritmasının diğer algoritmalara göre yüksek bir kümeleme başarısını makul bir sürede gerçekleştirdiğini göstermektedir.

Anahtar Kelimeler

• Akan veri kümeleme,k-boyutlu ağaç,uyarlanabilir yarıçap,tamamen çevrimiçi,evrimsel kümeleme

Kd-tree and adaptive radius (KD-AR Stream) based real-time data stream clustering

Öz

Data stream clustering is one of the most popular topics of today's world where the amount of data reaches incredible levels in parallel with technological developments. The most important problems encountered in data stream clustering approaches are the fact that most of the approaches consists of an online and offline phases, the definition of the number of cluster, or the need to set a limitation to this number, the problems encountered in determining optimum radius value, and the problems encountered in concept evolution. The present study proposes an evolutionary based solution method, which is based on Kd-Tree and adaptive radius (KD-AR Stream) to perform real-time clustering on the streaming data. The proposed approach has been compared with SE-Stream, DPStream and CEDAS algorithms in terms of both cluster quality and execution time. The results showed that KD-AR Stream algorithm has a good clustering performance within a reasonable time by comparison with the other algorithms.

Anahtar Kelimeler

• Data stream clustering,kd-tree,adaptive radius,fully online,evolving clustering

Kaynakça

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