SUMMARY
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These files contain 1,000,209 anonymous ratings of approximately 3,900 movies
made by 6,040 MovieLens users who joined MovieLens in 2000.
FURTHER INFORMATION ABOUT THE GROUPLENS RESEARCH PROJECT
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The GroupLens Research Project is a research group in the Department of
Computer Science and Engineering at the University of Minnesota. Members of
the GroupLens Research Project are involved in many research projects related
to the fields of information filtering, collaborative filtering, and
recommender systems. The project is lead by professors John Riedl and Joseph
Konstan. The project began to explore automated collaborative filtering in
1992, but is most well known for its world wide trial of an automated
collaborative filtering system for Usenet news in 1996. Since then the project
has expanded its scope to research overall information filtering solutions,
integrating in content-based methods as well as improving current collaborative
filtering technology.
Further information on the GroupLens Research project, including research
publications, can be found at the following web site:
http://www.grouplens.org/
GroupLens Research currently operates a movie recommender based on
collaborative filtering:
http://www.movielens.org/
RATINGS FILE DESCRIPTION
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All ratings are contained in the file "ratings.dat" and are in the
following format:
UserID::MovieID::Rating::Timestamp
- UserIDs range between 1 and 6040
- MovieIDs range between 1 and 3952
- Ratings are made on a 5-star scale (whole-star ratings only)
- Timestamp is represented in seconds since the epoch UTC
- Each user has at least 20 ratings
USERS FILE DESCRIPTION
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User information is in the file "users.dat" and is in the following
format:
UserID::Gender::Age::Occupation::Zip-code
All demographic information is provided voluntarily by the users and is
not checked for accuracy. Only users who have provided some demographic
information are included in this data set.
- Gender is denoted by a "M" for male and "F" for female
- Age is chosen from the following ranges:
* 1: "Under 18"
* 18: "18-24"
* 25: "25-34"
* 35: "35-44"
* 45: "45-49"
* 50: "50-55"
* 56: "56+"
- Occupation is chosen from the following choices:
* 0: "other" or not specified
* 1: "academic/educator"
* 2: "artist"
* 3: "clerical/admin"
* 4: "college/grad student"
* 5: "customer service"
* 6: "doctor/health care"
* 7: "executive/managerial"
* 8: "farmer"
* 9: "homemaker"
* 10: "K-12 student"
* 11: "lawyer"
* 12: "programmer"
* 13: "retired"
* 14: "sales/marketing"
* 15: "scientist"
* 16: "self-employed"
* 17: "technician/engineer"
* 18: "tradesman/craftsman"
* 19: "unemployed"
* 20: "writer"
MOVIES FILE DESCRIPTION
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Movie information is in the file "movies.txt" and is in the following
format:
MovieID::Title::Genres
- Titles are identical to titles provided by the IMDB (including
year of release)
- Genres are pipe-separated and are selected from the following genres:
* Action
* Adventure
* Animation
* Children's
* Comedy
* Crime
* Documentary
* Drama
* Fantasy
* Film-Noir
* Horror
* Musical
* Mystery
* Romance
* Sci-Fi
* Thriller
* War
* Western
- Some MovieIDs do not correspond to a movie due to accidental duplicate
entries and/or test entries
- Movies are mostly entered by hand, so errors and inconsistencies may exist