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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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Overlapping Models in Myrrix

I'm currently using Myrrix to get recommendations as follows: User,Item,Score But I'd like to add the ability to recommend as follows: Collection,Item,1 (where Collection is a group of Items - I could have called this Album and Song, but yes, the…
Andrew Regan
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Mahout - Item exists in test data but not training data

I am trying to evaluate a simple item-based recommender using PearsonCorrelationSimilarity. I load the DataModel from a file that contains userid, itemid, preference, timestamp (in this order) My code looks something like that: DataModel model =…
Dragan Milcevski
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What is the equivalent method of VectorWritable.addTo in mahout 0.5 in mahout 0.7?

I found the code for the book mahout in action is missing method. Mahout 0.7 seems do not have addTo. What is the equivalent? Thanks!
Treper
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What model or approach to use for this kind of "nested" recommendation?

I have a very specific recommendation problem. Suppose I have 3 types of values/entities - item, property, value. There are N items, A properties and B values. Each item has some number of property-value pairs.…
Nilesh
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Recommendation in Mahout without negative preference values

I have a question about the meaning of the preference values in Mahout. From the book Mahout in Action it says that: The preference value could be anything, as long as larger values mean stronger positive preferences. For instance, these values…
Dragan Milcevski
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Mahout - Item Similarity, but exclude Items a User has already "bought"

I want to create a video recommender, which recommends via similarity. The challenge is, that I want to exclude videos that the user has already seen. This seems like a pretty obvious case to me, but I don't find it covered. Any hint is appreciated!
Jens
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How to generate co-occurrence matrix (only) in Mahout

I couldn't find a way to generate only co-occurrence matrix given a preference input file (userID, itemID and optional rating) in Mahout. Is that possible? All I can find is generating a recommendation output and co-occurrence matrix seems to be…
kee
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Can I use Apache Mahout Taste for User Preferences matching?

I am trying to match objects based on predefined user preferences. A simple example would be finding best matching vechicle. Lets say a user 'Tom' is offered a rented vehicle for travel based on his predefined preferences. In this case, the…
Gopi
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Mahout - FileDataModel: Delete file(s) after refresh?

I use the FileDataModel as the DataModel for Recommendations in Mahout. I first generate the base file (e.g. prefs.txt). From time to time, there are some changes, which are written to update files (prefs.1.txt, prefs.2.txt, ...). Am I allowed to…
nico.ruti
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Can't read mahout output of PFPGrowth

i am successfully running Parallel FPGroth Algorithm of Apache mahout on top of hadoop. But the generetaed output text files are not readable as you can see…
Chris
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How to design a recommendation system for shift swapping?

I need to design an algorithm such that it handles the request for shift swapping and recommends a list of people who are more likely to swap that shift with the person by analyzing previous data. Can anyone list the techniques that will help me to…
Paras
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Vendor recommendation engine

I am working on portal where I have PO with details of ordered items and Vendor we are going to deal with. I am trying to make a item based Vendor recommendation engine for the next quotation so that buyer can have idea before dealing. Right now I…
Darshan Patel
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how to combine mahout recommendations

I'd like to build a simple recommendation system. Let's say for online shop, where I have events like purchases, likes, views. Currently, I understand how to build a recommendation for each of those types of events separately. But, I can't figure…
kikulikov
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Where mahout logs are stored

I'm new to to Mahout. I've run mahout clustering task, but it fails I'm unable get why this task fails, so where are mahout logs stored?
Vijay_Shinde
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Apache Mahout Training on Sample Data vs Implementing on Actual Data

The scenario is like this: I am trying to make a recommender using apache mahaout and i have some sample preference(user,item,preference value) data for generating the similarity matrix and determining item-item similarities. But the actual…
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