Collaborative recommendations using item-to-item similarity mappings

  • US 6,266,649 B1
  • Filed: 09/18/1998
  • Issued: 07/24/2001
  • Est. Priority Date: 09/18/1998
  • Status: Expired due to Term
First Claim
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1. In a multi-user computer system that provides user access to a database of items, a method of recommending items to a user, the method comprising the computer-implemented steps of:

  • (a) generating a non-user-specific data structure which maps individual items of the database to corresponding sets of similar items in which similarities between items are based at least upon the collective item interests of a community of users;

    (b) identifying items that are known to be of interest to the user;

    (c) for each of a plurality of the items identified in step (b), accessing the data structure to identify a corresponding set of similar items;

    (d) combining the sets of similar items identified in step (c) to generate a combined set of additionally similar items; and

    (e) recommending at least some of the similar items of the combined set generated in step (d) to the user;

    wherein step (a) is performed in an off-line mode, and steps (b)-(e) are performed substantially in real time in response to an online action by the user.

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