In delicious.com, users are able to bookmark website links with various meaningful tags, such as for a link titled "Sorting Algorithm Animations", one can tag it as "algorithm", "sort", and later (maybe after months) find this previously tagged bookmark by searching either "sort" or "algorithm". It greatly improves our way of keeping and organizing knowledge.
Also in delicious.com, when you search for a tag, say "algorithm", it is able to show all the associated tags to "algorithm". For example, the user has several bookmarks, and they are tagged as following: Link1: algorithm sort Link2: algorithm heap stack Link3: algorithm heap fantastic Link4: database architecture Then, the associated tags to "algorithm" will be "sort", "heap“, ”stack", "fantastic" (all tags that showed up together with "algorithm" in bookmarks). Further, we can also find associated tags to multiple tags. For example, when I search "algorithm" and "heap", the associated tags to these words will be "stack" and "fantastic". So, associated tags are tags that showed up together in some bookmarks with the given tags. The problem is how to implement this associated tag searching. The naive way will be first searching all the links that have the given tags (when I search for "algorithm" and "heap", it will return Link2 and Link3), then by looking through all the returned links, I get the tags that are associated to "algorithm" and "heap". This naive way surely works, but it's very time inefficient. Also, we cannot use indexing of tags. Say there're 3 links, each with 2 tags: L1: t1, t2 L2: t1, t3 L3: t2, t3 Then, if I search for associated tags to both "t1, t2", I'll get result as "t3", since t3 is indexed by both t1 in L2, and indexed by t2 in L3. But in fact there's no link that contains all t1,t2 and t3, so according to definition t3 should not appear in the result of associated tags. -- You received this message because you are subscribed to the Google Groups "Algorithm Geeks" group. To post to this group, send email to algoge...@googlegroups.com. To unsubscribe from this group, send email to algogeeks+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/algogeeks?hl=en.
