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From Najum Ali <>
Subject Re: simple idea for improving mahout docs over the next month?
Date Thu, 17 Apr 2014 08:49:43 GMT
Hi guys,

I´m pretty much new to mahout and I´m working with this problem here:

I have created a precomputed item-item-similarity collection for a GenericItemBasedRecommender.
Using the 1M MovieLens data, my item-based recommender is only 40-50% faster than without
precomputation (like 589.5ms instead 1222.9ms). 
But the user-based recommender instead is really fast, it´s like 24.2ms? How can this happen?

Why is item-based so slow?

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