Question: What are the challenges for classification and clustering in a large social network in comparison with classification and clustering in a single data relation? Suppose

What are the challenges for classification and clustering in a large social network in comparison with classification and clustering in a single data relation? Suppose each node in a network represents a paper, associated with certain properties such as author, research topic, and so on, and that each directed edge from node A to node B indicates that paper A cites paper B. Discuss the challenges of the effective classification and clustering scheme associated with the network that represents a paper.

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