A C library for product recommendations/suggestions using collaborative filtering (CF)

Recommender Build Status

GitHub stars GitHub license Language grade: C/C++

A C library for product recommendations/suggestions using collaborative filtering (CF).

Recommender analyzes the feedback of some users (implicit and explicit) and their preferences for some items. It learns patterns and predicts the most suitable products for a particular user.

Features

  • Collaborative Filtering
  • User and Item based recommenders
  • No external dependencies
  • Fast running time ~ 81 seconds for 10 million ratings (on MovieLens Data Sets)
  • Memory footprint under 160 MB for 10 million ratings

Webpage

http://ghamrouni.github.com/Recommender/

Building

To compile Recommender:

make

The compilation will produce libRecommender.a

To compile an example:

gcc test/test.c src/libRecommender.a -lm -o test/t1 -I src/

Alternatively you can use clang

clang test/test.c src/libRecommender.a -lm -o test/t1 -I src/

Keywords

Collaborative filtering, recommender system

References

  1. http://en.wikipedia.org/wiki/Recommendation_system
  2. http://public.research.att.com/~volinsky/netflix/kdd08koren.pdf
  3. http://research.yahoo.com/files/ieeecomputer.pdf
Owner
Ghassen Hamrouni
Software engineer passionate about algorithms, Computer Vision, Machine learning, computational geometry and Comp Sci.
Ghassen Hamrouni
https://github.com/GHamrouni/Recommender
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Comments
  • The usage of srand is incorrect

    The usage of srand is incorrect

    the generate_random_matrix is using srand(0) to generate random number everytime.

    srand(0) sets the seed of the random number generator to 0. Calling it again with the same parameter sets the seed to 0 again, and will cause the random generator to create the same output.

    e.g. srand(0); for(int i = 0; i<5; i++) printf(" %d ", rand());
    return 0;

    prints 1804289383 846930886 1681692777 1714636915 1957747793 all the time (should use something like srand(time(0)))

    So the matrix is not generated randomly as it should be.

  • make failed

    make failed 

    error: format specifies type 'unsigned int *' but the argument has
      type 'size_t *' (aka 'unsigned long *') [-Werror,-Wformat]
                if (fscanf (file, "%u %u", &i, &j) != 2)
                                      ~~       ^~
  • Invalid arguments in test.c

    Invalid arguments in test.c

    Function call in test.c

    estimate_rating_from_factors(0, 0, learned, model)

    gives the following error

    test.c: In function ‘main’: test.c:80:4: error: incompatible type for argument 2 of ‘estimate_rating_from_factors’ estimate_rating_from_factors(0, 0, learned, model));

    Function prototype from recommender.h

    double estimate_rating_from_factors(rating_estimator_parameters_t* estim_param, struct learning_model model);

    Comment from above prototype has 4 arguments while you have only defined 2.

  • Migrate LGTM.com installation from OAuth to GitHub App

    Migrate LGTM.com installation from OAuth to GitHub App

    Hi There,

    This project is still using an old implementation of LGTM's automated code review, which has now been disabled. To continue using automated code review, and receive checks on your Pull Requests, please install the GitHub App on this repository.

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