| 摘要 |
The present invention relates to an information processing apparatus and method, and a program storage medium which enable clustering to be performed such that the number of clusters and a representative of a cluster are determined so as to conform to a human cognition model. The notion of "typical examples" and "peripheral examples" in prototype semantics (FIG. 2A) can be developed as follows: such directivity in cognition of two items can be represented by an asymmetric distance measure in which a distance from a "typical example" to a "peripheral example" is longer than a distance from the "peripheral example" to the "typical example" as shown in FIG. 2B. Clustering in which the number of clusters and the representative of the cluster are determined so as to conform to the human cognition model is achieved by associating an asymmetric mathematical distance between two items with a relation between the two items to link the two items together by a "typical example" versus "peripheral example" relationship.
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