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Can you please suggest me a good model-based learning algorithm to recommend items to the user? Is there any open source implementation available on model based learning algorithm? I am sure Apache Mahout doesn't implemented any model based learning algorithms.

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Mahout can do even SVMs and RFs, they're very model-based. – mbq♦ Jun 8 '11 at 8:43
From Mahout document it says, Mahout supports both memory-based, item-based recommender systems, slope one recommenders, and a couple other experimental implementations. It does not currently support model-based recommenders. cwiki.apache.org/confluence/display/MAHOUT/… – Ananth Duari Jun 8 '11 at 9:59
@Ananth So you must only manually make a recommender from a model. – mbq♦ Jun 8 '11 at 10:45
well it is not with Mahout now. But is there are any other opensource been implemented on that? – Ananth Duari Jun 8 '11 at 10:48
There is a reason why Mahout lacks them -- it is just too hard to consider all the possibilities and optimize such recommender. You won't find an app with "Make model recommender" button -- this is just a work for a human do design such system personalized to your case. – mbq♦ Jun 8 '11 at 11:01
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