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I was wondering if there is any open source recommendation engine available? It should suggest something like Amazon and Netflix. I have heard of a framework called Apache Mahout - Taste. I am trying it next week. It would be great if you can share your valuable thoughts.
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With a large number of items, recommendations on the full candidate set quickly become too computationally intensive. Operating on a neighbourhood of items drastically reduces the time taken to make predictions but also reduces the information the model has to rank.
Matrix factorization is a collaborative filtering method to find the relationship between items' and users' entities. Latent features, the association between users and movies matrices, are determined to find similarity and make a prediction based on both item and user entities.
In return, the collaborative filtering system provides useful personalized recommendations for new items.
I'm the developer of Mahout / Taste, and hope it will do what you need, but in the interest of balanced coverage, let me also point you at:
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