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MyMediaLite: How to implement a recommender in C#


MyMediaLite 3.11 has been released.

It's easy

Implementing recommenders in MyMediaLite is very easy. All infrastructure is already in place, you can concentrate on the algorithm.

For the basic functionality, all you need to is:

That's all! Here is an example for implementing a rating predictor. You can read the complete source code of the SlopeOne class in MyMediaLite's git repository.

Inherit from RatingPredictor, Define Model Data Structures

By inheriting from the RatingPredictor class, you get the complete infrastructure that your new recommender will need, most notably the Ratings data. Slope One needs two matrices, one for storing the mean rating difference between two items, and one for storing the number of item pairs the average is based on. The average rating is used as a fallback.

Implement the Train() Method

Implement the Predict() Method

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