recommenderlab | Testing Recommender Algorithms - R package | Recommender System library
kandi X-RAY | recommenderlab Summary
kandi X-RAY | recommenderlab Summary
This R package provides an infrastructure to test and develop recommender algorithms. The package supports rating (e.g., 1-5 stars) and unary (0-1) data sets. Supported algorithms are:. For evaluation, the framework supports given-n and all-but-x protocols with.
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Community Discussions
Trending Discussions on recommenderlab
QUESTION
Can anyone explain why these two correlation matrices return different results?
...ANSWER
Answered 2019-Jun-19 at 17:26The dissimilarity() = 1 - pmax(cor(), 0)
R base function. Also, it is important to specify the method
for both of them to use the same one:
QUESTION
i'm current construct product recommendation using R recommenderlab, after compute AR recommender, i'm hoping to understand the association rules, but i couldn't found any why to extract the complete association rules from the recommender object.
Below is the sample dataset
...ANSWER
Answered 2019-Apr-11 at 11:10you can use
QUESTION
I'm current running R-64bit (version 3.4.4) on windows machine with recommenderlab version 0.2-2
Below is the sample dataset
...ANSWER
Answered 2019-Apr-07 at 01:28Is a bug and the issue solved on latest development version (version 0.2-4.1), current available on Github. Kindly check the details Here
QUESTION
Want to save recommenderlab predict list as list of "" seperated list. I have one question in place for the same but here want to extend it with a twist.
I already tried few approaches and found below as relavent but stuck with a simple step of putting the ouptput in "" comma seperated script.
...ANSWER
Answered 2018-Dec-26 at 13:22Given that cat(paste0(shQuote(list1[["291"]]),collapse=","))
produces the string of movie recommendations, one could do the following to turn this into a data frame tagged with a name:
QUESTION
I have a recommendation problem that is fairly simple: I would like build a hybrid recommender with recommenderlab
in R where I recommend already liked movies in the MovieLense
data set together with popular movies and some random movies.
ANSWER
Answered 2018-Dec-19 at 13:59You just need to precise that you are recommending items to the user or users from the training dataset as followed :
QUESTION
I am trying to work on a recommendation system in R
.
Data Set below:
https://drive.google.com/file/d/1FVh-Xg3NBtzKgZHnDTi7IjaATW_fPmW9/view?usp=sharing
ANSWER
Answered 2018-May-10 at 02:56I got the answer:
There are some users in the data who have rated the same beer more than once (twice/thrice... etc.). So recommenderLabs when coercing data into realRatingMatrix adds the rating of such rows and that's why value of ratings are more than 5 and length of getRatings is less than nrow of beer_data.
E.g. sample beer_data
beer_beerid, review_profilename, review_overall
19667, 57md, 3.5 19667, 57md, 4.0
so in realRatingMatrix for user="57md" and item = "19667" rating = 3.5+4 = 7.5 and 1 row gets reduced in realRatingMatrix.
And due to the same reason, non unique combination of beer_beerid and rating getting combined which is causing mismatch in count of rating in both objects, dataframe and realRatingMatrix.
QUESTION
I have a matrix I have coerced from a realRatingMatrix in recommenderlab package in R. The data contains predictions of ratings between 0-1 for a number of products.
The matrix should contain customer numbers along the rows (row 2 down) so that column 1 header is row label, and product IDs along the columns in the first row from column 2 onwards. The problem I have is when I coerce to a matrix the data structure becomes messy:
EDIT: Link to Github repository www.github.com/APBuchanan/recommenderlab-model
...ANSWER
Answered 2018-Apr-26 at 09:48So with the data you gave, I whipped up a solution here.
You said "I need to extract the customer numbers from the test split of data and drop that into the first column of the matrix - that's my main issue". The way to extract that is either: colnames(wsratings)
or dimnames(wsratings)[[2]]
.
Once you have this vector (length of 320), you want to "drop that to the first column". You're asking for a cbind()
, but the length of the data you want to bind it contains 43 row. You can't bind them together because the length of the two elements are not the same or multiples of each other.
Assuming you have the full dataset and their length matches, then the code would be:
QUESTION
I am trying to build a product recommendation model using binary data.
I have an issue with my code that I think stems from how the structure of my source data changes when I pass the function data.matrix=as(df,"binaryRatingMatrix")
My code is as follows:
...ANSWER
Answered 2018-Apr-17 at 14:10Well I've figured it out - for some reason, between reading in my csv and coercing to "binaryRating Matrix" I had to convert df to a matrix first.
QUESTION
So at the moment I am trying to figure out how to build a movie recommender system from MovieLense (https://grouplens.org/datasets/movielens/100k/). I read some instructions from a tutorial.
...ANSWER
Answered 2017-Sep-11 at 03:08Try replacing library(dplyr)
with library(tidyverse)
. The spread
function now lives in the tidyr
package which is part of the tidyverse
along with dplyr
.
QUESTION
I am trying to test a binary recommendation systems I created with the recommenderlab
package. When I run the calcPredictionAccuracy
function I get the following error:
Error in .local(x, data, ...) : You need to specify how many items were given for the prediction! I have performed numerous searches and can't seem to find any solution to this issue. If I try to add the given argument the error changes to:
error.ubcf<-calcPredictionAccuracy(p.ubcf, getData(test_index, "unknown", given=3)) Error in .local(x, ...) : unused argument (given = 3)
Here is a quick look at my code:
my data set is binary.watch.ratings
...ANSWER
Answered 2017-Jul-28 at 04:34for topNList, you must specify the number of items you want back. So you add these with the predict() function call:
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