The weights w can also be binary variables; if some weights (e.g., w2 and ws) equal one, it means a user’s demand (or an item of knowledge resource) is related with the corresponding categories k2 and ks; otherwise the weights equal zero.
The weights w can also be binary variables; if some weights (e.g., w2 and ws) equal one, it means a user’s demand (or an item of knowledge resource) is related with the corresponding categories k2 and ks; otherwise the weights equal zero.