Questions tagged [recommender-system]

Everything related to recommender systems

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5
votes
4answers
152 views

Business exception reporting

I work in an analytical role at a a large financial services firm. We do a ton of daily reporting over metrics that rarely change in a meaningful way from day to day. From this daily reporting, our ...
11
votes
3answers
5k views

Field Aware Factorization Machines

Can anyone explain how field-aware factorization machines (FFM) compare to standard Factorization Machines (FM)? Standard: http://www.ismll.uni-hildesheim.de/pub/pdfs/Rendle2010FM.pdf "Field Aware": ...
6
votes
3answers
116 views

Can we quantify how position within search results is related to click-through probability?

Suppose, for example, that the first search result on a page of Google search results is swapped with the second result. How much would this change the click-through probabilities of the two results? ...
6
votes
2answers
7k views

Cosine Similarity for Ratings Recommendations? Why use it?

Lets say I have a database of users who rate different products on a scale of 1-5. Our recommendation engine recommends products to users based on the preferences of other users who are highly similar....
1
vote
2answers
735 views

Recommended Language/Framework for Building a New Recommendation Engine

Next week I'm going to begin prototyping a recommendation engine for work. I've implemented/completed the Netflix Challenge in Java before (for college) but have no real idea what to use for a ...
3
votes
1answer
101 views

Trouble representing a problem

I have a problem and I'm having trouble representing it - first I thought I should use graph theory (nodes and edges) and now I'm not sure. My data is some tanks names and it's volumes, those tanks ...
2
votes
0answers
41 views

Modeling Pipeline Budget

I have been tasked with creating a pipeline chart with the live data and the budgeted numbers. I know what probability of each phase of reaching the next. The problem is I have no Idea what to do ...
3
votes
1answer
1k views

Database for a trie, or other appropriate structure for recommendation engine

We are storing the information about our users showing interest in our items. Based on this information, we would like to create a simple recommendation engine that will take the items I1, I2, I3 etc ...
16
votes
2answers
7k views

Recommending movies with additional features using collaborative filtering

I am trying to build a recommendation system using collaborative filtering. I have the usual [user, movie, rating] information. I would like to incorporate an ...
23
votes
4answers
9k views

Meaning of latent features?

I am learning about matrix factorization for recommender systems and I am seeing the term latent features occurring too frequently but I am unable to understand ...
6
votes
2answers
2k views

Create most “average” cosine similarity observation

For a recommendation system I'm using cosine similarity to compute similarities between items. However, for items with small amounts of data I'd like to bin them under a general "average" category (in ...
6
votes
1answer
1k views

How to normalize results of Singular Value Decomposition (SVD) between 0 and 1?

I'm building a recommender system and using SVD as one of the preprocessing techniques. However, I want to normalize all my preprocessed data between 0 and 1 because all of my similarity measures (...
12
votes
2answers
1k views

Preference Matching Algorithm

There's this side project I'm working on where I need to structure a solution to the following problem. I have two groups of people (clients). Group A intends to ...
6
votes
2answers
2k views

Difference between using RMSE and nDCG to evaluate Recommender Systems

What kind of error measures do RMSE and nDCG give while evaluating a recommender system, and how do I know when to use one over the other? If you could give an example of when to use each, that would ...
9
votes
1answer
1k views

How should one deal with implicit data in recommendation

A recommendation system keeps a log of what recommendations have been made to a particular user and whether that user accepts the recommendation. It's like ...
18
votes
3answers
242 views

Does click frequency account for relevance?

While building a rank, say for a search engine, or a recommendation system, is it valid to rely on click frequency to determine the relevance of an entry?