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Questions tagged [mahout-recommender]

A collaborative filtering engine takes users' preferences for items and returns estimated preferences for other items.

Mahout provides a rich set of components from which you can construct a customized recommender system from a selection of algorithms. Mahout is designed to be enterprise-ready; it's designed for performance, scalability and flexibility.

See Mahout Recommender Documentation

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Mahout Recomendaton engine recommending products and with its Quantity to customer

i am working on mahout recommendation engine use case.I precomputed recommendations and stored in database. now i am planning to expose with taste rest services to .net.i had limited customers and products.it is distributor level recommendation use…
Sravan K Reddy
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content based recommender in hadoop

I am thinking about implementing a content based recommendation project idea in hadoop. Just wanted suggestions if weka can be used with hadoop or if it is advisable to use Mahout for a cbf based implementation Please advise Thanks
Rookie
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Apache Mahout Item based Recommender

Can I compute recommendations for new users with item preferences within the same item set, and knowing the item similarity matrix from previously existing user-ratings, without recomputing the similarity matrix?
Nilesh
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How to make DataModel with multiple-input-file in mahout?

I want to make DataModel with numerous *.csv files.(these have same format, different data) But, I have no idea how to do that. I cannot find function through mahout documentation.(mahout-API) "Make module that makes numerous *.csv file to one…
Binary_tree
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Apache mahout evaluation extremely slow - with modified NearestNUserNeighborhoud

I have modified the NearestNUserNeighborhoud to add some extra value to users that belong to a trust network. The trust network is in a database (MySQL). When I recommend items for a certain users it works well and provides the…
Nick
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Can't get mahout itemsimilarity result with preferences (booleanValue=false)

I'm trying to create get itemismilarity using mahout. The problem is that I do get few similarities in output. Here are my input data characteristics: 15.910.847 total count of preferences 4.047.745 distinct users 773.015 distinct items I've built…
Capacytron
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Mahout's cross-entities, multi-input recommendations

I have a number of boolean data sets, like: Books: book_id user_id 1 1 2 1 3 1 3 2 3 3 and Movies: movie_id user_id 1 1 1 2 1 3 2 5 This means, that user_id represent the…
There Are Four Lights
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Implicit feedback recommendation - Incorrect results

I am new to mahout and I building an implicit feedback recommender using the parallelALS job given here. Each row of my dataset consists of user_id, product_id, preference_score(which is the number of visits made by the user for the product). The…
Sneha
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How could I use mahout with hadoop in Eclipse?

I want to use eclipse to develop my project with mahout-0.9 and hadoop-2.2.0. I could run my code with mahout-0.9 successfully. But I faced the problem how could I run my project with hadoop mod? I think I have to install hadoop in my computer, and…
LoveTW
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Mahout RecommenderEvaluator with IDRescorer

I use RecommenderEvaluator to estimate Mahout's recommendation efficiency. Currently, I try to improve recommendation results with IDRescorer which will do some post-processing boost of the searched items. RecommenderEvaluator evaluator = new…
kikulikov
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Dataset with more than three values

I am planning to create a recommender system using apache Mahout. I searched on internet about it. and i found it uses the following format for dataset file. userId, itemId, preference what i want to use as a dataset have structure like this. Id,…
user3297557
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why the result of method mostSimilarItems in mahout is not order by the weight?

I have the following codes: ItemSimilarity itemSimilarity = new UncenteredCosineSimilarity(dataModel); recommender = new GenericItemBasedRecommender(dataModel,itemSimilarity); List items = recommender.mostSimilarItems(10, 5); my…
zhouyan8603
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mahout GenericUserBasedRecommender

I am new for Apache Mahout. I am very confused how GenericUserBasedRecommender method works. For example: UserSimilarity similarity =new PearsonCorrelationSimilarity (dataModel); UserNeighborhood neighborhood =new NearestNUserNeighborhood (2,…
mnemosyne
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Need clarification about usage of mahout with hadoop

I currently have an implementation of a recommender in mahout using the in memory recommendation apis. However, I would like to move to a distributed solution using hadoop in order to calculate offline recommendations. This is my first time using…
dmcqu314
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NPE in Mahout TopItems#getTopUsers

I'm using the mahout version 0.9. I have got NPE at demo server with following stacktrace. HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerExceptiontype Exception reportmessage Request processing failed; nested…
VladS
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