Clustering applications of IFDBSCAN algorithm with comparative analysis

Abstract

Density Based Spatial Clustering of Application with Noise (DBSCAN) is one of the mostly preferred algorithm among density based clustering approaches in unsupervised machine learning, which uses epsilon neighborhood construction strategy in order to discover arbitrary shaped clusters. DBSCAN separates dense regions from low density regions and simultaneously assigns points that lie alone as outliers to unearth the hidden cluster patterns in the datasets. DBSCAN identifies dense regions by means of core point definition, detection of which are strictly dependent on input parameter definitions: ε is distance of the neighborhood or radius of hypersphere and MinPts is minimum density constraint inside ε radius hypersphere. Contrarily to classical DBSCAN’s crisp core point definition, intuitionistic fuzzy core point definition is proposed in our preliminary work to make DBSCAN algorithm capable of detecting different patterns of density by two different combinations of input parameters, particularly is a necessity for the density varying large datasets in multidimensional feature space. In this study, preliminarily proposed DBSCAN extension is studied: IFDBSCAN. The proposed extension is tested by computational experiments on several machine learning repository real-time datasets. Results show that, IFDBSCAN is superior to classical DBSCAN with respect to external & internal performance indices such as purity index, adjusted rand index, Fowlkes-Mallows score, silhouette coefficient, Calinski-Harabasz index and with respect to clustering structure results without increasing computational time so much, along with the possibility of trying two different density patterns on the same run and trying intermediary density values for the users by manipulating α margin.

A Review on Optimal Design of Fluid Machinery Using Machine Learning Techniques

“…Density-Based Spatial Clustering of Applications with Noise (DBSCAN) is one of the most preferred algorithms among density-based clustering methods. In the study of variable density spatial clustering for high-dimensional data, Unver et al [60] proposed the definition of fuzzy core points so that DBSCAN can try two different density modes in the same operation, and initially put forward the DBSCAN extension IFDBSCAN. The summary for unsupervised learning is provided in Table 3.…”

“…Unver et al [60] They proposed defining fuzzy core points to enable DBSCAN to operate with two different density modes simultaneously. This proposal also includes the initial concept of a DBSCAN extension called IFDB-SCAN.…”