Questions tagged [recommender-system]

Everything related to recommender systems

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44 views

Multidimensional collaborative filtering model

I have a dataset that is approximately structured in the following way: 500 users, 500 products, 100 countries, 2 seasons, 300000 ratings. Meaning that I have 300,000 rows containing unique ...
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8 views

What public datasets exist for content-based recommendation? (e.g. News Recommendation)

I'm an AI Master student working on my Thesis. My research focuses on content-based User Modelling in Recommendation. More specifically, I'm aiming at improving methods of User Modelling to cover more ...
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23 views

Operations on Recommendation Embeddings

I've trained a recommendation system to recommend steam games based on game tags. An example output is shown below, where GAME is the game recommended based on the <...
2
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0answers
9 views

How to use ndcg metric for binary relevance

I am working on a ranking problem to predict the right single document based on the user query and use the NDCG metric to measure the model. Given the details : Queries ( Q ), Result Document ( D ),...
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1answer
23 views

Calculate Similarity using User's Personal Data?

I want to find out which users are similar to each other using their personal/organisational data, such as department, company, site, etc. I have this data in a boolean format, as shown below: ...
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2answers
41 views
+50

How to calculate precision at K and NDCG for ranking algorithms

I am ranking a filtered item list as per user's metadata and historical behaviour. Now how to calculate metrices like precision at K? One approach could be - Divide historical data in training and ...
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0answers
17 views

How to evaluate a content recommendation model unsupervised (unlabeled dataset)?

I have a lot of unlabeled data which is crawled from job listings and I'm trying to build a content based recommendation model. I just need if someone could help me out on how to evaluate such model. ...
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15 views

clustering changing Label

I have dataset with clustering label (this label is the group of each point) and I want to create such recommendation system or any other model to help the point for changing his group (for example ...
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1answer
23 views

CV(Curriculum vitae) Recommendation System guidance

I am building a recommender system which matches people's CV with a vacancy. So far, I used TF-IDF & Cosine Similarity to get a matching score between a vacancy and a candidate's CV. I want to ...
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0answers
6 views

Which Factorization Machine (FMs) method works on train , test and validation data format?

I am working on a project where my data have train, test and validation format. I want to use the Factorization Method for binary classification.
2
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1answer
28 views

Calculating Rank Ordering Error Metric for implicit recommendation

I'm reading Collaborative Filtering for Implicit Feedback Datasets. On page 6 they detail their evaluation strategy, which they define as mean Expected Percentile Ranking with the following formula: $...
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1answer
32 views

Can a recommendation system be used as a binary classifier?

I have a computer-generated music project, and I'd like to classify short passages of music as "good" or "bad" via machine learning. I won't have a large training set. I'll start by generating 500 ...
5
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1answer
51 views

Evaluating the performance of a machine learned recommendation system

I have a set of resumes $R=\{{r_1,...,r_n\}}$, which I've transformed to a vector space using TF-IDF. Each resume has a label, which is the name of their current employer. Each of these labels comes ...
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41 views

Examples of the use of xgboost for recommender systems?

Are there any state-of-the-art implementations of xgboost in recommender systems? I'm looking for GitHub implementations but also papers that discuss this. I've only found this paper https://...
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1answer
22 views

Using Amazon Personalize to build a Recommendation System

I would like to build a recommendation system based only in the items metadata. I have an input vector with some desirable topics that the user want to read about, for example: (self-help, yoga, ...
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0answers
9 views

how to use user KPI score data for making recommendations based on improving the performance

I have a dataset with these data points: user_id login_points meeting_complete points meeting_missed_points call_points lead_created_points and some features which tells the user activity and ...
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0answers
7 views

Time series modeling with unknown sampling times

My problem is building a recommendation engine, where actions should lead to desired range of states. A state is measured by a sensor - one continuous feature. An action is measured by a different ...
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0answers
172 views

How to calculate NDCG in recommendation system

This is a question about NDCG, which is a recommendation evaluation metric. The following are being used as evaluation indicators for recommendations. $$DCG = r_1 + \sum\limits_{i=2}^{N}\frac{r_i}{...
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1answer
33 views

How to encode an array of categories to feed into sklearn

I'm working on a recommendation problem, broadly following the Youtube paper on theirs. Their surrogate problem is to recommend the next video a user will watch. One feature they include in their ...
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1answer
21 views

Value error in an embedding layer

I am new to deep learning and I am trying to build a book recommender system using embedding layers. I use one layer for the book and one for the user. I am having trouble with fitting the model. ...
0
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1answer
31 views

exercise 9.3.2 from mmds book

I am reading this book http://infolab.stanford.edu/~ullman/mmds/ch9.pdf there is an exercise 9.3.2 a) it says Exercise 9.3.2 : In this exercise, we cluster items in the matrix of Fig. 9.8. Do the ...
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1answer
174 views

How to draw neural network diagrams with this particular style?

I would like to draw a neural network architecture with the follow style. Do you know which tool can be used to do this? The paper is Operation-aware Neural Networks for User Response Prediction.
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23 views

nDCG - choose relevance scores

I am evaluating a recommender system using nDCG. The recommender system predicts similar movies for a given movie. I want to evaluate predicted similarity rankings by comparing them to a ground truth ...
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0answers
32 views

Understanding reduced dimension embedding from tabular data

Background I am working on building a collaborative filtering recommender system in Keras for a school project, following an approach from this article. The approach is to take tabular user, item ...
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1answer
95 views

TS-SS and Cosine similarity among text documents using TF-IDF in Python

A common way of calculating the cosine similarity between text based documents is to calculate tf-idf and then calculating the linear kernel of the tf-idf matrix. TF-IDF matrix is calculated using ...
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1answer
25 views

On the offline evalution of recommender system

There are mainly three ways to evaluate a recommender system: offline, online and user study. For most academic papers, offline evaluation is used to show the improvements: They split the offline ...
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0answers
9 views

play session from ratings dataset in Movie20 M

I need to extract listening sessions from the ratings dataset which has the columns cols = [userId movieId rating timestamp] timestamp is just a number for eg 1112486027 listening sessions are ...
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0answers
21 views

Recommender system heavily biased towards popular items

I am training a pure collaborative filtering recommender system on MovieLens 1M using Tensorflow-Ranking. I use embeddings to represent users and items and feed concatenated embeddings through two ...
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0answers
8 views

How to validate collaborative filtering recommender system in r?

I have a project which I have to make a recommender system of BX Books dataset. I use cosine similarity as my algorithm. I came up with this script of R: ...
6
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1answer
164 views

Understanding the softmax output in Youtube's recommender

This question has been asked before, but never (that I can see) satisfactorily answered. I'm reading Youtube's paper on their recommender system. The system has two elements, the first of which is a ...
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19 views

Transfer Learning and Recommender Systems

I have a task in which I am pretending to have an "unobserved" system, let's call it the target system, that I am using an LSTM from a similar system that has observations to perform the regression. I ...
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8 views

Testing Setup in Temporal Tensor Factorization for Recommendation

I am trying to wrap my head around Temporal Tensor Factorization for Collaborative Filtering, as described in the paper: Temporal Collaborative Filtering with Bayesian Probabilistic Tensor ...
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1answer
64 views

Understanding the “Wide” part of Google's wide and deep

Google's wide and deep recommender model sounds really cool, but I'm struggling to believe I'm grasping the wide section right so wanted to check my understanding. Their paper says the following: ...
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0answers
13 views

Can we treat sentiment score of the review text as rating of the product?

I have a review text of the different products, And I need the rating of the product. So can we use sentiment score as the rating of the product.
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24 views

Recommendation system without user data

I have a recommendation project to build without user data. Suppose I am building a initial recommendation system with the initial dataset with me only consisting of ...
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1answer
32 views

When to stop showing content on recommendation engines?

Let's take an example. I log into my Netflix account and see that it's suggesting the show Friends to me. But I have no interest in watching Friends. So I ignore it. The next time I login, it suggests ...
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2answers
70 views

Recommendation system depend on user rating and favorite list

In my project I have a database of Japanese Sake(rice wine).Each Sake has following attributes which has direct link to the taste of the Sake: classification (enumeration 1-5 integer) alcohol ...
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0answers
12 views

SVD++ in matrix form

I have been recently reading the following presentation and papers preceding it: http://staff.ustc.edu.cn/~ynyang/group-meeting/2014/matrix-factorization/Matrix-factorization-recommendation-system-...
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0answers
29 views

Mobile App Recommendation: How to get the rate of a specific user submit for a specific application

I have a mobile app recommendation project, so I need data set which has user-app matrix-rate. Actually, I want to know what rate does a specific user submit for a specific application. in other words,...
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0answers
12 views

In learning latent factors in matrix factorization, are weights learned based on similarity between e.g. users?

I implemented a recommendation system using user-user interaction data, learning missing ratings through alternating least squares and matrix factorization, which as I understand it, adjusts and ...
5
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1answer
256 views

How is the cross-product transformation defined for binary features?

I am reading the paper on Wide & Deep learning and for the wide component, it states that one of the most important transformations is the cross-product transformation. This is defined as follows: ...
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0answers
15 views

supervised similarity scoring system - recommender system

I have a dataset of movie collections with 10-15 features describing each movie. I also have a dataset of user ratings of the similarity between some random pairs of movies. Using both of these data ...
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0answers
36 views

What is the difference between row-wise and column-wise Z-score normalization?

I have a data set, each row represents a movie name, each column is a feature (such as genres), I want to perform cosine similarity to find out the similarity between each movie, before that I need to ...
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0answers
41 views

What is the “matrix trick” in recommendation systems?

I just found slides from Matt Gormley (CMU) about recommendation systems. Under the heading "Unconstrained Matrix Factorization" he mentions: Optimization problem SGD SGD with Regularization ...
2
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1answer
717 views

memory error in matrix cosine_similarity

I have (20905040, 7) of a dataset to recommend 10 different product to the user it could be larger than that but anyway I got memory error when processing the ...
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3answers
36 views

If I have to recommend 10 movies to the users

Let's say I have some information about a user and movie data similar to the following: ...
2
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1answer
43 views

Item-based recommender using K-NN

I'm trying to build an item-based recommender using k-nn. I have a list of items, all of which have some properties (features) in common. ...
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0answers
28 views

How to perform Learning to Rank for a small dataset

I am very interested in applying Learning to rank to my problem doamin. When I read through the literature of Learning to rank I ...
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0answers
5 views

How to validate model which outputs movies that are similar with no training data

At a high level, my code takes a wide variety of movie related features and computes a large cosine similarity matrix and assesses which movies are most similar. I don't have any validation data so ...
0
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1answer
205 views

Predict Customer Next Purchase with Sequence

Suppose I buy products: [1,2,3,4] Another customer X bought: [2,3] Most probably customer X next purchase will be: 4 Sequence is very important in my problem I tried association analysis using R, ...