Data clustering is the process of grouping data items so that similar items are placed in the same cluster. There are several different clustering techniques, and each technique has many variations.

In model-based clustering, the density of each cluster is usually assumed to be a certain basic parametric distribution, for example, the normal distribution. In practice, it is often difficult to ...

Clustering is concerned with coherently grouping observations without any explicit concept of true groupings. Spectral graph clustering—clustering the vertices of a graph based on their spectral ...