Re: implementation of context-aware recommender in Mahout

2015-03-06 Thread Pat Ferrel
The new Spark based recommender can easily handle context in many forms. See the top references section here http://mahout.apache.org/users/recommender/intro-cooccurrence-spark.html It does not use the IDRescorer approach at all so perhaps you should describe what you want to use as context.

Re: spark-itemsimilarity question: what's the difference between indicator-matrix and cross-indicator-matrix

2015-03-06 Thread Ted Dunning
The terms main and secondary are a bit confusing. The easiest definition is that cooccurrence analyzes the record of actions you want to recommend. Cross occurrence tries to transfer from one behavior to another. In practice, it has been common to conflate many behaviors into one precisely

implementation of context-aware recommender in Mahout

2015-03-06 Thread Efi Koulouri
Hi all, I am trying to implement an context-aware recommender in Mahout. As I haven't use the library before I haven't a lot experience. So, I would really appreciate your response! What I want to do is to implement the two context- aware approaches that have been proposed, pre-filtering and

spark-itemsimilarity question: what's the difference between indicator-matrix and cross-indicator-matrix

2015-03-06 Thread Kevin Zhang
May I say indicator-matrix is for the main action for example purchase and the cross-indicator-matrix is for the secondary action? Thanks a lot, Kevin

Random Forest on old mapred API

2015-03-06 Thread Wei Li
Hi All: For some reasons, we need to re-implement the Random Forest in mahout based on old MapRed API to run it on our Hadoop deployment, we know that old MapRed API is different from new MapReduce API, could you please give me some hint on how to do this? many thanks. Best Wei