Collaborative Network Library is a simple implementation of a collaborative filter for use in cross-sell or product recommendation scenarios.  It is composed of an in-memory interconnected network or graph of items. Each vertex on the graph is connected by a weighted and directed edge which describes the number of time a user has purchased|visited|viewed the source item and then proceeded to the target item. The library includes a simple API to query the graph for the next set of recommended items. Recommended items are based on the weight of the outward links from the active item.

This library can be easily integrated with a .Net-based e-commerce web site as well as any .Net product that deals with a highly interconnected network of products. Visualization of the evolved graph can be easily done via the freely accessible GraphViz product (no affiliation).

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