Hierarchical decision fusion of recommender scores

A method for providing hierarchical decision fusion of recommender scores, said method comprising the steps of:

• (a) providing a plurality of recommenders at a first level, said recommenders being grouped to at least one of a plurality of predetermined groups;
• (b) providing a predetermined number of first level fusion centers for receiving an output from each of said recommenders from at least one particular group;
• (c) outputting a decision by each one of said plurality of recommenders grouped in step (a) to a respective first level fusion center, wherein each decision provides a recommendation;
• (d) each respective first level fusion center performing a first fusing step of the decisions output in step (c) by said recommenders from said at least one particular group;
• (e) each respective first level fusion center outputting a first enhanced decision based on the fusion performed in step (d);
• (f) providing a plurality of second level fusion centers for receiving the first enhanced decisions output from a group of said first level fusion centers;
• (g) each respective second level fusion center performing a second fusing step of the first enhanced decisions received from the group of said first level fusion centers;
• (h) each respective second level fusion center outputting a second enhanced decision;
• and
• (i) outputting to a user a finally enhanced decision chosen from the enhanced decisions in step (h).