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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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No Recommendation made on small Dataset, despite best Pearson Corellation similarity

I am facing a small problem while running Recommender engine in Mahout: The data set on which I am working is given below: 1,101,5.0 1,102,4.0 1,103,4.0 1,107,5.0 1,108,3.0 2,101,3.0 2,102,4.0 2,104,4.0 2,105,4.0 3,101,5.0 3,102,4.0 When I…
Sam
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How to run mahout from command line with KNN based Item Recommender?

I'm new to mahout and still trying to figure things out. I'm trying to run a KNN based recommender using mahout 0.8 that runs in hadoop cluster (distributed recommender). I'm using mahout 0.8, so KNN is deprecated, but it is still usable (at least…
Daniel W
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Version matching among hadoop, mahout and CDH

I need to work with the latest mahout release which is 0.9(Since I need to use all distributed recommendation algorithms). For this, which version of hadoop should I use? In some places, it has been mentioned that hadoop 2.20 does not work well…
DesirePRG
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Mahout PreferenceArray userID uniqeness?

Does the userId of a preferenceArray need to be unique across all entries in a FastByIDMap? I'm comparing two types of objects that contain similar traits however it's possible that their id (primary key) is not unique as it's two db tables. Thanks.
Mike Summers
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Why does Apache Mahout ItemSimilarity use LP-Space normalization

Why is LP-Space normalization being used for Mahout VectorNormMapper for Item similarity. Have also read that the norm power of 2 works great for CosineSimilarity. Is there an intuitive explanation of why its being used and how can best values for…
Yash Sharma
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Problems running Mahout and Hadoop

I'm new at Mahout and Hadoop. I've successfully installed Hadoop Cluster with 3 machines, and the cluster is running fine, and I just installed Mahout on the Main namenode for "testing purposes", and I followed the instructions of installation and…
Muhammad Adly
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Integration Hive with Mahout for Recommendation

I want to use mahout with hive, i will get data from hive and use data model some thing like to populate data and use mahout for recommendation. is this possible. because i have seen mahout is working only for files. 1) how to load data to mahout…
techsivam
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how to get user preference in mahout datamodel

I am trying out mahout and wondering about the input datamodel for non-distributed version file datamodel has to follow: userid, itemid, userPreference the problem is i dont have this user preference values, have to precompute it does mahout have…
ikel
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common.AbstractJob: Unexpected -libjars while processing Job-Specific Options

all! When I use RecommenderJob in my project, I met an unexpected error. The arguments passed to the job is a String array which has values as follows: [-libjars, /path/to/xxx.jar,/path/to/yyy.jar, --input, hdfs://localhost:9000/tmp/x, --output,…
Dzanvu
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Performance Issue with Item-Based Recommender in Mahout

I am trying to use the item based recommender in mahout. It contains 2.5 M user,item interaction, without preference values. There are around 100 items and 100k users.It takes around 10s to recommend. Whereas for same data it takes less than a…
soyeb84
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how can I use mahout results?

I want build a basic movie recommender system. I searched and I found apache mahout.I used some method but I don't know how can I use those results. import java.io.File; import java.io.IOException; import…
hydrojan
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Can't import GenericBooleanPrefItemBasedRecommender

I am trying to compile a sample Mahout code. However I am having problems importing GenericBooleanPrefItemBasedRecommender. When I check my system the libraries is found and the other libraries in the directory import without a problem. Can someone…
user2694306
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Too much data and not enough machines in our Hadoop cluster for Mahout Item-based CF

At work I'm trying to build an Item-based recommendation system based on Mahout's Item-based CF package. Here's the problem that what we are dealing with: Number of users: 6,000,000 Number of items: 200,000 Preferences: 10,000,000,000 If we have…
user2818034
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Why is Apache Mahout's Recommender.recommend() function slow?

I am using Apache Mahout Item Based Recommender with item-item similarity on a data-set of 400 items and 5M users.I am using TanimotoCoefficientSimilarity and GenricItemBasedRecommender. But when i call the function recommender.recommend, for every…
user3095388
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Is there any way to perform recommendation for entities with one to many association?

I'm trying out recommendation system(academic exercise) for a specific use case where users and items are one to many associated. Say at a given time a particular item can be owned by only one user. User can own multiple items at a time. Any…
Suren Raju
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