Questions tagged [recommender-system]
Everything related to recommender systems
266
questions
2
votes
1answer
32 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.
...
0
votes
0answers
7 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 ...
0
votes
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
votes
1answer
25 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, ...
1
vote
0answers
9 views
Reducing the Number of Training Samples for collaborative filtering recommender systems
I have the following problem: I am doing some research on the accuracy of recommender algorithms that are mostly used nowadays.
So, one way to measure their performance is by checking how well they ...
0
votes
0answers
12 views
what will be the best algorithm for find similar users based on user features , betwenn knn, euclidian or jaccard?
I have user data table containing user data like university, gender, city, id etc. I also have a matrix data-set like this .
[
0
votes
1answer
13 views
learning a distance metric from the output of a knn output
Suppose that someone has trained a nearest-neighbor algorithm based on some unknown metric. I have a large dataset of $N$ observations, and $P$ features. For each observation I am given $K$ indices ...
0
votes
1answer
47 views
Student-Teacher maching problem
The problem I want to solve is as follows:
I have data about how many teaching hours different students spend with their teacher in order to pass their exams. The teaching varies from 25-55 hours. In ...
1
vote
0answers
12 views
What is the current state of the art solution for Movielens 100k / 20M?
I found Basic recommendation system for Movilens dataset using Keras which has a solution which works ok (MAE 0.84).
What is the current state of the art for this dataset?
2
votes
1answer
25 views
How does recommendation by matrix factorization deal with new movies / users for which there are ratings?
Assume you have the ratings of $n$ users for $m$ movies in a matrix $R \in \mathbb{R}^{n \times m}$. You compute a representation
$$R = U \times \Sigma \times V$$
by initializing $u_i, v_j \forall i ...
0
votes
0answers
6 views
Recommender with global explicit feedback
I've to build a recommendation system with a dataset where the feedback is given for the whole set of items instead to the specific items. We can see that feedback as a numerical indicator of the ...
0
votes
1answer
10 views
Document matching with more priority to certain features than others
I am working on recommendation systems wherein I need to match the similarity of 2 users. Now, I know that I can use Tfidf vectorizer to calculate the the cosine similarity score between them. But, ...
0
votes
0answers
14 views
Handling collection of featurevectors for classification
I have a data set where devices are represented by a collection of variables. These variables consist of several properties like a name, datatype, driver, limit values, etc. (mixed data; quantitative ...
4
votes
6answers
158 views
Distance between users
I want to compute the "distance" between users in order to return the top n similar users, for any given user.
For each user a have a bunch of features.
This is close to a recommendation system, ...
0
votes
0answers
7 views
Building a dynamic recommender system that changes based on how users rate
I am trying to build a recommender system for coding interview questions.
I thought of doing a collaborative-filtering, but it is hard to get data on how other users rated the questions.
I currently ...
1
vote
1answer
27 views
Recommender systems and Machine Learning
According to Mitchell:
“A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T , as measured by P , ...
0
votes
0answers
14 views
Building a personalized recommender system for coding interview questions?
I am trying to build a recommender system for coding interview questions.
Let's say I have data for interview questions and the features are
...
0
votes
0answers
7 views
Any library recommendations for a Python recommender framework with multi-class input, incl. array input?
(crosspost from https://softwarerecs.stackexchange.com/questions/62491/python-recommender-framework-with-array-input, this meta post seems to justify doing this. I really really need answers to this, ...
0
votes
0answers
18 views
How can you recommend songs based on a user's past listening history by genre (content filtering)?
I'm interested in getting a user's past listening history from Spotify (API call to recently played) and being able to suggest songs from the Charts (another API call for current chat listings) that a ...
0
votes
0answers
20 views
Building recommendation engine from transactions data
I am trying to build a recommendation engine for an e-commerce company and I have the following input files :
1) past user transactions + in-app events
2) a new list of campaigns I should recommend ...
0
votes
0answers
7 views
How to reduce complexity of inference stage in recommender systems?
Given a large set of customers and a large set of items, how to make predictions given a model like this one:
https://arxiv.org/pdf/1606.07792.pdf
As stated in the article:
"Since there are over a ...
1
vote
1answer
60 views
Use machine learning to predict next schedule meeting for sales officers
I have a project with data of sales field officers who visit their customers and enter the progress details. Visit can be an order or any kind of customer interaction.
Let's say one sales guy has ...
0
votes
0answers
11 views
We know the subspace generated from the data instances, but we cannot constitute the origin space
I was wondering, what if we know the subspace generated F from the data instances, but we cannot constitute the origin space E that can be in higher dimension, and can easily lead us to the true join ...
2
votes
1answer
33 views
Calculate a ranking function from classification features
I am using 3 features (x1, x2, x3) for binary classification. All my feature values are in 0 to 1 range (unit range).
I obtained how important each feature was in ...
1
vote
1answer
37 views
How to use testing data set to measure recommender system algorithm
I am new to recommender systems and am trying to build one using item-to-time CF. Currently, I am trying to evaluate/measure results using MAE. I have one step which is unclear (after I managed to ...
0
votes
0answers
13 views
What is the accepted level of persona coverage for Recommender Systems?
Almost all of e-commerce companies use recommender systems which involve a set of personas. (explained in this post).
"Your personas will never cover 100% of your users"
In practice, what is the ...
0
votes
0answers
21 views
scala spark FP-Growth no results displayed
I have implemented the FP-growth algorithm and it works fine with this sample data:
r z h k p
z y x w v u t s
s x o n r
x z y m t s q e
z
x z y r q t p
when I ...
0
votes
0answers
14 views
I got a overall mean average precision score of 0 for a recommendation engine
I just wanted to know if receiving an overall MAP score of 0 in a recommendation engine was possible, or a sign that my calculation or my logic for the engine was wrong.
1
vote
0answers
87 views
Cosine similarity with arrays contaning NaN
I am trying to calculate a cosine similarity using Python in order to find similar users basing on ratings they have given to movies. As it can be expected there are a lot of NaN values.
I am using ...
0
votes
1answer
22 views
How many time a recommender system can recommand the same item to an user?
I'm working on an hybrid music recommender system project, my goal is to create recommendation playlists in accordance with users tastes.
I already implemented the first part which use a collaborative ...
1
vote
0answers
17 views
Personalised search ranking for hotels
I've built hotel embeddings which gives very satisfactory results in returning similar hotels for each hotel.
Now the problem I'm trying to solve is to rank the hotels in order of relevancy to the ...
1
vote
0answers
37 views
Is it a good idea to train Neural Network for classification on dataset where each document has a different class i.e. no class is repeated again?
My goal is to build a recommendation model for which I want to use Neural Network (LSTM). The user will give some input keywords and the model should return the suggestions (classes) based on ...
0
votes
1answer
25 views
How to validate recommender model in healthcare?
In order to validate a recommender model, a usual approach is create a hold-out set that will provide random suggestions (similar to an A/B testing setup).
However, in healthcare applications, this ...
1
vote
0answers
19 views
How do I recommend items to out of training users based on its recent views?
I used Spark's ALS implementation of matrix factorization (Collaborative Filtering for Implicit Feedback) to train user and item embeddings.
Since we have a lot of users in system, I had to sample ...
1
vote
1answer
28 views
What is the range of values of the expected percentile ranking?
I'm currently reading
Hu, Koren, Volinsky: Collaborative Filtering for Implicit Feedback Datasets
One thing that confuses me is the "expected percentile ranking", an function the authors define to ...
1
vote
1answer
66 views
Understanding Youtube recommender (candidate generation step)
I'm trying to understand https://storage.googleapis.com/pub-tools-public-publication-data/pdf/45530.pdf
Their candidate generation step outputs topn items
via softmax (with negative sampling) at ...
1
vote
1answer
46 views
A weird result from a recommender system
Say there're the top 10 most popular items among 100 sales products and about 100k users regularly purchase items on daily basis.
...
1
vote
0answers
28 views
Mining Association rules from a data warehouse and a transactional database [closed]
I wonder if it is possible to perform market basket analysis to extract the association rules from a data warehouse and a transactional database in the same time to predict the future purchases of a ...
0
votes
2answers
29 views
How do I correctly build model on given data to predict target parameter?
I have some dataset which contains different paramteres and data.head() looks like this
Applied some preprocessing and performed Feature ranking -
...
6
votes
2answers
1k views
Do recommendation systems necessarily use machine learning algorithms?
I am studying about evaluation of both recommendation systems and machine learning algorithms in recent times, trying to define a scope for my masters research. After some reading time I'm starting to ...
0
votes
1answer
36 views
Null predictions for ALS in Pyspark
I am trying to read from my dataset which has three coloumns. (User, Repository and Number of Stars)
In[10]
...
0
votes
0answers
24 views
Can transfer learning be applied to predict sales
Let matrix A be a user item matrix.Upon performing UV decomposition , I get a user factor matrix and factor entity matrix. The company I am interning at doesn't keep track of the user factor matrix.I ...
0
votes
0answers
5 views
Does cardinality of ratings column affect performance of matrix factorization based collaborative filtering?
I am using mllib's implicit preference based implementation of collaborative filtering for generating grocery product recommendations in e-commerce, based on this Netflix Prize winning algorithm. I ...
0
votes
0answers
34 views
How to training the recurrent recommender system with LSTM?
Recently, I read a paper about recurrent recommender system, I am very curious about how it training its network.
Assume I have the Netflix dataset as
...
1
vote
0answers
19 views
recommend new category paths based on factor item matrix and sales of the items
Matrix A be a user item matrix. Upon performing UV decomposition, I have just the V matrix.
The matrix A differs every week and I get a new V matrix every week. The matrix U is not kept track of and ...
0
votes
1answer
39 views
Learning similarity of representations
I am interested in a framework for learning the similarity of different input representations based on some common context. I have looked into word2vec, SVD and other recommender systems, which does ...
1
vote
4answers
64 views
How to match a user with another user based on their taste?
Information available
Consider that there are N users on a platform. Every user adds items that they like on their profile. These items have static attributes that describe the product.
...
0
votes
1answer
33 views
How to match a user with other users with similar interests based on their attributes?
Information Available
Consider, there are 'n' users and they have these attributes and values
...
0
votes
0answers
18 views
Finding unobserved ratings using matrix factorization
Suppose that the utility matrix contains ratings of user on movies. How does matrix factorization find ratings for unobserved (user, movie) pair. Even though the purpose of the algorithm is to find ...
0
votes
0answers
19 views
Neighbourhood based approach on implicit feedback datasets
Is it possible to use a neighbourhood-based approach on implicit feedback dataset? I have a dataset with information about how many times a certain item was viewed by a particular user. I know that MF ...
