MOVIE RECOMMENDATIONS SYSTEM (like Netflix) Example Data Format (from MovieLens) Ratings file userId, movieId, rating, timestamp 1, 31, 2.5, 1260759144 1, 1029, 3.0, 1260759179 1, 1061, 3.0, 1260759182 2, 31, 3.5, 835355493 2, 1029, 4.0, 835355493 movieId, title, genres 1, Toy Story (1995), Animation|Children|Comedy 2, Jumanji (1995), Adventure|Children|Fantasy 3, Grumpier Old Men (1995), Comedy|Romance How k-NN Uses This Data Typical approach: • Users rate movies • k-NN finds similar users • Recommend movies liked by similar users This is called: User-Based Collaborative Filtering MovieLens data MovieLens data sets were collected by the GroupLens Research Project at the University of Minnesota. This data set consists of: * 100,000 ratings (1-5) from 943 users on 1682 movies. * Each user has rated at least 20 movies. * Simple demographic info for the users (age, gender, occupation, zip) userId,movieId,rating,timestamp 1,31,2.5,1260759144 1,1029,3.0,1260759179 1,1061,3.0,1260759182 1,1129,2.0,1260759185 1,1172,4.0,1260759205 1,1263,2.0,1260759151 1,1287,2.0,1260759187 1,1293,2.0,1260759148 1,1339,3.5,1260759125 1,1343,2.0,1260759131 1,1371,2.5,1260759135 1,1405,1.0,1260759203 1,1953,4.0,1260759191 1,2105,4.0,1260759139 1,2150,3.0,1260759194 1,2193,2.0,1260759198 1,2294,2.0,1260759108 1,2455,2.5,1260759113 1,2968,1.0,1260759200 1,3671,3.0,1260759117 2,10,4.0,835355493 2,17,5.0,835355681 2,39,5.0,835355604 2,47,4.0,835355552 2,50,4.0,835355586 2,52,3.0,835356031 2,62,3.0,835355749 2,110,4.0,835355532 2,144,3.0,835356016 2,150,5.0,835355395 2,153,4.0,835355467 2,161,3.0,835355493 2,165,3.0,835355441 2,168,3.0,835355731 2,185,3.0,835355511 2,186,3.0,835355395 2,208,3.0,835355511 2,222,5.0,835355840 2,223,5.0,835355552 2,225,3.0,835355552 2,235,4.0,835355395 2,248,3.0,835355395 2,261,4.0,835355867 2,265,3.0,835355395 2,266,5.0,835355552 2,272,3.0,835355552 2,273,4.0,835355395 2,292,3.0,835355395 2,296,4.0,835355395 2,300,3.0,835355395 2,302,3.0,835355395 2,303,3.0,835355395 2,304,4.0,835355395 2,305,2.0,835355395 2,306,3.0,835355395 2,307,4.0,835355395 2,308,3.0,835355395 2,309,3.0,835355395 2,310,3.0,835355395 2,311,4.0,835355395 2,312,3.0,835355395 2,313,4.0,835355395 2,314,3.0,835355395 2,315,3.0,835355395 2,316,3.0,835355395 2,317,4.0,835355395 2,318,3.0,835355395 2,319,3.0,835355395 2,320,4.0,835355395 2,321,3.0,835355395 2,322,3.0,835355395 2,323,4.0,835355395 2,324,3.0,835355395 2,325,3.0,835355395 2,326,4.0,835355395 2,327,3.0,835355395 2,328,3.0,835355395 2,329,4.0,835355395 2,330,3.0,835355395 2,331,3.0,835355395 2,332,4.0,835355395 2,333,3.0,835355395 2,334,3.0,835355395 2,335,4.0,835355395 2,336,3.0,835355395 2,337,3.0,835355395 2,338,4.0,835355395 2,339,3.0,835355395 2,340,3.0,835355395 2,341,4.0,835355395 2,342,3.0,835355395 2,343,3.0,835355395 2,344,4.0,835355395 2,345,3.0,835355395 2,346,3.0,835355395 2,347,4.0,835355395 2,348,3.0,835355395 2,349,3.0,835355395 2,350,4.0,835355395 2,351,3.0,835355395 Movies movieId,title,genres 1,Toy Story (1995),Adventure|Animation|Children|Comedy|Fantasy 2,Jumanji (1995),Adventure|Children|Fantasy 3,Grumpier Old Men (1995),Comedy|Romance 4,Waiting to Exhale (1995),Comedy|Drama|Romance 5,Father of the Bride Part II (1995),Comedy 6,Heat (1995),Action|Crime|Thriller 7,Sabrina (1995),Comedy|Romance 8,Tom and Huck (1995),Adventure|Children 9,Sudden Death (1995),Action 10,GoldenEye (1995),Action|Adventure|Thriller 11,"American President, The (1995)",Comedy|Drama|Romance 12,Dracula: Dead and Loving It (1995),Comedy|Horror 13,Balto (1995),Adventure|Animation|Children 14,Nixon (1995),Drama 15,Cutthroat Island (1995),Action|Adventure|Romance 16,Casino (1995),Crime|Drama 17,Sense and Sensibility (1995),Drama|Romance 18,Four Rooms (1995),Comedy 19,Ace Ventura: When Nature Calls (1995),Comedy 20,Money Train (1995),Action|Comedy|Crime|Drama|Thriller 21,Get Shorty (1995),Comedy|Crime|Thriller 22,Copycat (1995),Crime|Drama|Horror|Mystery|Thriller 23,Assassins (1995),Action|Crime|Thriller 24,Powder (1995),Drama|Sci-Fi 25,Leaving Las Vegas (1995),Drama|Romance 26,Othello (1995),Drama 27,Now and Then (1995),Children|Drama 28,Persuasion (1995),Drama|Romance 29,City of Lost Children, The (1995),Adventure|Fantasy|Sci-Fi 30,Shanghai Triad (Yao a yao yao dao waipo qiao) (1995),Crime|Drama 31,Dangerous Minds (1995),Drama 32,Twelve Monkeys (1995),Mystery|Sci-Fi|Thriller 33,Babe (1995),Children|Drama 34,Dead Man Walking (1995),Crime|Drama 35,It Takes Two (1995),Children|Comedy 36,Clueless (1995),Comedy|Romance 37,Cry the Beloved Country (1995),Drama 38,Richard III (1995),Drama|War 39,Dead Presidents (1995),Action|Crime|Drama 40,Restoration (1995),Drama 41,Mortal Kombat (1995),Action|Adventure|Fantasy 42,To Die For (1995),Comedy|Drama|Thriller 43,How to Make an American Quilt (1995),Drama|Romance 44,Seven (a.k.a. Se7en) (1995),Mystery|Thriller 45,Pocahontas (1995),Animation|Children|Drama|Musical|Romance 46,When Night Is Falling (1995),Drama|Romance 47,Usual Suspects, The (1995),Crime|Mystery|Thriller 48,Mighty Aphrodite (1995),Comedy|Drama|Romance 49,Lamerica (1994),Adventure|Drama 50,Big Green, The (1995),Children|Comedy 51,Georgia (1995),Drama 52,Home for the Holidays (1995),Drama 53,Postman, The (Postino, Il) (1994),Comedy|Drama|Romance 54,Confessional, The (Confessionnal, Le) (1995),Drama|Mystery 55,Indian in the Cupboard, The (1995),Adventure|Children|Fantasy 56,Eye for an Eye (1996),Drama|Thriller 57,Mr. Holland's Opus (1995),Drama 58,Don't Be a Menace to South Central While Drinking Your Juice in the Hood (1996),Comedy 59,Two if by Sea (1996),Comedy|Romance 60,Bio-Dome (1996),Comedy 61,Lawnmower Man 2: Beyond Cyberspace (1996),Action|Sci-Fi 62,French Twist (Gazon maudit) (1995),Comedy|Romance 63,Friday (1995),Comedy 64,From Dusk Till Dawn (1996),Action|Comedy|Horror|Thriller 65,Fair Game (1995),Action 66,Kicking and Screaming (1995),Comedy|Drama 67,Misérables, Les (1995),Drama 68,Bed of Roses (1996),Drama|Romance 69,Screamers (1995),Action|Sci-Fi|Thriller 70,Nico Icon (1995),Documentary 71,Crossing Guard, The (1995),Drama 72,Juror, The (1996),Drama|Thriller 73,White Balloon, The (Badkonake sefid) (1995),Children|Drama 74,Things to Do in Denver When You're Dead (1995),Crime|Drama|Romance 75,Antonia's Line (Antonia) (1995),Comedy|Drama 76,Once Upon a Time... When We Were Colored (1995),Drama 77,Last Summer in the Hamptons (1995),Comedy|Drama 78,Angels and Insects (1995),Drama|Romance 79,White Squall (1996),Adventure|Drama 80,Dunston Checks In (1996),Children|Comedy 81,Black Sheep (1996),Comedy 82,Nick of Time (1995),Action|Thriller 83,Mary Reilly (1996),Drama|Thriller 84,Vampire in Brooklyn (1995),Comedy|Horror 85,Beautiful Girls (1996),Comedy|Drama|Romance 86,Broken Arrow (1996),Action|Adventure|Thriller 87,In the Bleak Midwinter (1995),Comedy 88,Hate (Haine, La) (1995),Crime|Drama 89,Shopping (1994),Action|Thriller 90,Heidi Fleiss: Hollywood Madam (1995),Documentary 91,City Hall (1996),Drama|Thriller 92,Bottle Rocket (1996),Adventure|Comedy|Crime 93,Mr. Wrong (1996),Comedy 94,Unforgettable (1996),Mystery|Sci-Fi|Thriller 95,Happy Gilmore (1996),Comedy 96,Bridges of Madison County, The (1995),Drama|Romance 97,Nobody Loves Me (Keiner liebt mich) (1994),Comedy|Drama 98,Muppet Treasure Island (1996),Adventure|Children|Comedy|Musical 99,Catwalk (1996),Documentary 100,Braveheart (1995),Action|Drama|War The visual png comparing users 6,68 - the blue lines are 6 and the orange are 68 Youtube explaining cosine similarity: https://www.youtube.com/watch?v=P3j70Qw-bPY