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Caching can significantly improve the efficiency of information access in networks by reducing the access latency and bandwidth/energy usage. However, caching in too many nodes can take up too much memory, incur extensive caching-related traffic, and hence, may even result in performance degradation. This paper addresses the problem of caching data items in networks with the objective of minimizing the overall cost under the constraint that the data item can be cached at only a limited number of network nodes.
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