where is a data point, is the ith cluster, and is the centroid of A large positive value of VRC indicates that the clustering performance is superior. In this study, and in (5) and (6) were set to 1.5 and 0.9, respectively.
Table 1 shows the performance results, which were averaged over the results of 30 trials. It is apparent that the proposed IAP method has a longer computational time and more exemplars than the original AP method. However, the former exhibits superior clustering performance, compared with the two conventional methods. Note that the running time was calculated using a PC (CPU: firstname.lastname@example.org GHz, RAM: 8.0 GB). Hence, it can be concluded that rules (5) and (6) work effectively in the original AP method.
Conflicts of Interest
The authors declare no conflicts of interest.
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