Help/RateItPlugin

RateIt: A recommender system, based on MovieLens and "suggest".

Store user ratings per pagename. The wikilens theme displays a navbar image bar with some nice Javascript magic and this plugin shows various recommendations.

There should be two methods to store ratings:

• In a SQL database as in wikilens http://dickens.cs.umn.edu/dfrankow/wikilens

The most important fact: A page has more than one rating. There can be (and will be!) many ratings per page (ratee): different raters (users), in different dimensions. Are those stored per page (ratee)? Then what if I wish to access the ratings per rater (user)?

Wikilens plans several user-centered applications like:

• a) show my ratings
• b) show my buddies' ratings
• c) show how my ratings are like my buddies'
• d) show where I agree/disagree with my buddy
• e) show what this group of people agree/disagree on

If the ratings are stored in a real DB in a table, we can index the ratings by rater and ratee, and be confident in performance. Currently MovieLens has 80,000 users, 7,000 items, 10,000,000 ratings. This is an average of 1400 ratings/page if each page were rated equally. However, they're not: the most popular things have tens of thousands of ratings (e.g., "Pulp Fiction" has 42,000 ratings). If ratings are stored per page, you would have to save/read huge page metadata every time someone submits a rating. Finally, the movie domain has an unusually small number of items-- I'd expect a lot more in music, for example.

For a simple rating system one can also store the rating in the page metadata (default).

Recommender Engines:

• Recommendation/Prediction is a special field of "Data Mining"

• For a list of (also free) software see http://www.the-data-mine.com/bin/view/Software/WebIndex

  • movielens: (Java Server) will be gpl'd in summer 2004 (weighted)
  • suggest: is free for non-commercial use, available as compiled library (non-weighted)
  • Autoclass: simple public domain C library
  • MLC++: C++ library http://www.sgi.com/tech/mlc/

Usage

Note: The wikilens theme or any derivate must be enabled, to enable this plugin!

        <<RateIt>> just the widget without text
        <<RateIt show=top>> text plus widget below
        <<RateIt show=ratings>> to show my ratings
TODO:   <<RateIt show=buddies>> to show my buddies
        <<RateIt show=ratings dimension=1>>
TODO:   <<RateIt show=text>> just text, no widget, for dumps

Arguments

Example

<<RateIt>>

Author

• Dan Frankowski (wikilens author),
• Reini Urban (as plugin)

See Also

• Help:UserRatingsPlugin

To do

• finish mysuggest.c (external engine with data from mysql)