├── .github └── FUNDING.yml ├── .gitignore ├── .travis.yml ├── README.md ├── package-lock.json ├── package.json └── src ├── data ├── keywords.csv ├── movies_metadata.csv └── ratings_small.csv ├── index.js ├── preparation ├── movies.js └── ratings.js └── strategies ├── collaborativeFiltering.js ├── common.js ├── contentBased.js └── linearRegression.js /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: rwieruch 4 | patreon: # rwieruch 5 | open_collective: # Replace with a single Open Collective username 6 | ko_fi: # Replace with a single Ko-fi username 7 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel 8 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry 9 | liberapay: # Replace with a single Liberapay username 10 | issuehunt: # Replace with a single IssueHunt username 11 | otechie: # Replace with a single Otechie username 12 | custom: # Replace with a single custom sponsorship URL 13 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | node_modules -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: node_js 2 | 3 | node_js: 4 | - stable 5 | 6 | install: 7 | - npm install 8 | 9 | script: 10 | - npm test -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Recommendation System in JavaScript with MovieLens Database 2 | 3 | [![Build Status](https://travis-ci.org/javascript-machine-learning/movielens-recommender-system-javascript.svg?branch=master)](https://travis-ci.org/javascript-machine-learning/movielens-recommender-system-javascript) 4 | 5 | A recommender system in JavaScript built with NodeJs. It uses the popular [MovieLens](https://www.kaggle.com/rounakbanik/the-movies-dataset/data) database which includes information about movies and ratings of users. The recommender system implements the following recommendation strategies: 6 | 7 | * linear regression with gradient descent learning 8 | * content based recommendation 9 | * collaborative filtering (CF) recommendation 10 | * item based CF 11 | * user based CF 12 | 13 | ## Installation 14 | 15 | * `git clone git@github.com:javascript-machine-learning/movielens-recommender-system-javascript.git` 16 | * `cd movielens-recommender-system-javascript` 17 | * `npm install` 18 | * `npm start` 19 | 20 | Copyright 2019 rwieruch 21 | 22 | Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 23 | 24 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 | -------------------------------------------------------------------------------- /package-lock.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "recommendation-system-javascript", 3 | "version": "1.0.0", 4 | "lockfileVersion": 1, 5 | "requires": true, 6 | "dependencies": { 7 | "abbrev": { 8 | "version": "1.1.1", 9 | "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz", 10 | "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==", 11 | "dev": true 12 | }, 13 | "ansi-align": { 14 | "version": "2.0.0", 15 | "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz", 16 | "integrity": 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"graceful-fs": "4.1.11", 3546 | "imurmurhash": "0.1.4", 3547 | "signal-exit": "3.0.2" 3548 | } 3549 | }, 3550 | "xdg-basedir": { 3551 | "version": "3.0.0", 3552 | "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz", 3553 | "integrity": "sha1-SWsswQnsqNus/i3HK2A8F8WHCtQ=", 3554 | "dev": true 3555 | }, 3556 | "yallist": { 3557 | "version": "2.1.2", 3558 | "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz", 3559 | "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=", 3560 | "dev": true 3561 | } 3562 | } 3563 | } 3564 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "recommender-system-javascript-movielens", 3 | "version": "1.0.0", 4 | "description": "", 5 | "main": "index.js", 6 | "scripts": { 7 | "start": "nodemon src/index.js --exec babel-node --presets es2015,stage-2", 8 | "test": "echo \"No test specified\" && exit 0" 9 | }, 10 | "keywords": [], 11 | "author": "", 12 | "license": "ISC", 13 | "devDependencies": { 14 | "babel-cli": "^6.24.1", 15 | "babel-preset-es2015": "^6.24.1", 16 | "babel-preset-stage-2": "^6.24.1", 17 | "nodemon": "^1.11.0" 18 | }, 19 | "dependencies": { 20 | "compute-cosine-similarity": "^1.0.0", 21 | "fast-csv": "^2.4.1", 22 | "mathjs": "^3.18.0", 23 | "natural": "^0.5.4" 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /src/index.js: -------------------------------------------------------------------------------- 1 | // https://www.kaggle.com/rounakbanik/the-movies-dataset/data 2 | // Exercise: Content-based - Include credits data with crew and cast too 3 | // Exercise: Content-based - Make features weighted based on popularity or actors 4 | // Exercise: Collaborative Filtering - Model-based CF with SVD 5 | 6 | import fs from 'fs'; 7 | import csv from 'fast-csv'; 8 | 9 | import prepareRatings from './preparation/ratings'; 10 | import prepareMovies from './preparation/movies'; 11 | import predictWithLinearRegression from './strategies/linearRegression'; 12 | import predictWithContentBased from './strategies/contentBased'; 13 | import { predictWithCfUserBased, predictWithCfItemBased } from './strategies/collaborativeFiltering'; 14 | import { getMovieIndexByTitle } from './strategies/common'; 15 | 16 | let MOVIES_META_DATA = {}; 17 | let MOVIES_KEYWORDS = {}; 18 | let RATINGS = []; 19 | 20 | let ME_USER_ID = 0; 21 | 22 | let moviesMetaDataPromise = new Promise((resolve) => 23 | fs 24 | .createReadStream('./src/data/movies_metadata.csv') 25 | .pipe(csv({ headers: true })) 26 | .on('data', fromMetaDataFile) 27 | .on('end', () => resolve(MOVIES_META_DATA))); 28 | 29 | let moviesKeywordsPromise = new Promise((resolve) => 30 | fs 31 | .createReadStream('./src/data/keywords.csv') 32 | .pipe(csv({ headers: true })) 33 | .on('data', fromKeywordsFile) 34 | .on('end', () => resolve(MOVIES_KEYWORDS))); 35 | 36 | let ratingsPromise = new Promise((resolve) => 37 | fs 38 | .createReadStream('./src/data/ratings_small.csv') 39 | .pipe(csv({ headers: true })) 40 | .on('data', fromRatingsFile) 41 | .on('end', () => resolve(RATINGS))); 42 | 43 | function fromMetaDataFile(row) { 44 | MOVIES_META_DATA[row.id] = { 45 | id: row.id, 46 | adult: row.adult, 47 | budget: row.budget, 48 | genres: softEval(row.genres, []), 49 | homepage: row.homepage, 50 | language: row.original_language, 51 | title: row.original_title, 52 | overview: row.overview, 53 | popularity: row.popularity, 54 | studio: softEval(row.production_companies, []), 55 | release: row.release_date, 56 | revenue: row.revenue, 57 | runtime: row.runtime, 58 | voteAverage: row.vote_average, 59 | voteCount: row.vote_count, 60 | }; 61 | } 62 | 63 | function fromKeywordsFile(row) { 64 | MOVIES_KEYWORDS[row.id] = { 65 | keywords: softEval(row.keywords, []), 66 | }; 67 | } 68 | 69 | function fromRatingsFile(row) { 70 | RATINGS.push(row); 71 | } 72 | 73 | console.log('Unloading data from files ... \n'); 74 | 75 | Promise.all([ 76 | moviesMetaDataPromise, 77 | moviesKeywordsPromise, 78 | ratingsPromise, 79 | ]).then(init); 80 | 81 | function init([ moviesMetaData, moviesKeywords, ratings ]) { 82 | /* ------------ */ 83 | // Preparation // 84 | /* -------------*/ 85 | 86 | const { 87 | MOVIES_BY_ID, 88 | MOVIES_IN_LIST, 89 | X, 90 | } = prepareMovies(moviesMetaData, moviesKeywords); 91 | 92 | let ME_USER_RATINGS = [ 93 | addUserRating(ME_USER_ID, 'Terminator 3: Rise of the Machines', '5.0', MOVIES_IN_LIST), 94 | addUserRating(ME_USER_ID, 'Jarhead', '4.0', MOVIES_IN_LIST), 95 | addUserRating(ME_USER_ID, 'Back to the Future Part II', '3.0', MOVIES_IN_LIST), 96 | addUserRating(ME_USER_ID, 'Jurassic Park', '4.0', MOVIES_IN_LIST), 97 | addUserRating(ME_USER_ID, 'Reservoir Dogs', '3.0', MOVIES_IN_LIST), 98 | addUserRating(ME_USER_ID, 'Men in Black II', '3.0', MOVIES_IN_LIST), 99 | addUserRating(ME_USER_ID, 'Bad Boys II', '5.0', MOVIES_IN_LIST), 100 | addUserRating(ME_USER_ID, 'Sissi', '1.0', MOVIES_IN_LIST), 101 | addUserRating(ME_USER_ID, 'Titanic', '1.0', MOVIES_IN_LIST), 102 | ]; 103 | 104 | const { 105 | ratingsGroupedByUser, 106 | ratingsGroupedByMovie, 107 | } = prepareRatings([ ...ME_USER_RATINGS, ...ratings ]); 108 | 109 | /* ----------------------------- */ 110 | // Linear Regression Prediction // 111 | // Gradient Descent // 112 | /* ----------------------------- */ 113 | 114 | console.log('\n'); 115 | console.log('(A) Linear Regression Prediction ... \n'); 116 | 117 | console.log('(1) Training \n'); 118 | const meUserRatings = ratingsGroupedByUser[ME_USER_ID]; 119 | const linearRegressionBasedRecommendation = predictWithLinearRegression(X, MOVIES_IN_LIST, meUserRatings); 120 | 121 | console.log('(2) Prediction \n'); 122 | console.log(sliceAndDice(linearRegressionBasedRecommendation, MOVIES_BY_ID, 10, true)); 123 | 124 | /* ------------------------- */ 125 | // Content-Based Prediction // 126 | // Cosine Similarity Matrix // 127 | /* ------------------------- */ 128 | 129 | console.log('\n'); 130 | console.log('(B) Content-Based Prediction ... \n'); 131 | 132 | console.log('(1) Computing Cosine Similarity \n'); 133 | const title = 'Batman Begins'; 134 | const contentBasedRecommendation = predictWithContentBased(X, MOVIES_IN_LIST, title); 135 | 136 | console.log(`(2) Prediction based on "${title}" \n`); 137 | console.log(sliceAndDice(contentBasedRecommendation, MOVIES_BY_ID, 10, true)); 138 | 139 | /* ----------------------------------- */ 140 | // Collaborative-Filtering Prediction // 141 | // User-Based // 142 | /* ----------------------------------- */ 143 | 144 | console.log('\n'); 145 | console.log('(C) Collaborative-Filtering (User-Based) Prediction ... \n'); 146 | 147 | console.log('(1) Computing User-Based Cosine Similarity \n'); 148 | 149 | const cfUserBasedRecommendation = predictWithCfUserBased( 150 | ratingsGroupedByUser, 151 | ratingsGroupedByMovie, 152 | ME_USER_ID 153 | ); 154 | 155 | console.log('(2) Prediction \n'); 156 | console.log(sliceAndDice(cfUserBasedRecommendation, MOVIES_BY_ID, 10, true)); 157 | 158 | /* ----------------------------------- */ 159 | // Collaborative-Filtering Prediction // 160 | // Item-Based // 161 | /* ----------------------------------- */ 162 | 163 | console.log('\n'); 164 | console.log('(C) Collaborative-Filtering (Item-Based) Prediction ... \n'); 165 | 166 | console.log('(1) Computing Item-Based Cosine Similarity \n'); 167 | 168 | const cfItemBasedRecommendation = predictWithCfItemBased( 169 | ratingsGroupedByUser, 170 | ratingsGroupedByMovie, 171 | ME_USER_ID 172 | ); 173 | 174 | console.log('(2) Prediction \n'); 175 | console.log(sliceAndDice(cfItemBasedRecommendation, MOVIES_BY_ID, 10, true)); 176 | 177 | console.log('\n'); 178 | console.log('End ...'); 179 | } 180 | 181 | // Utility 182 | 183 | export function addUserRating(userId, searchTitle, rating, MOVIES_IN_LIST) { 184 | const { id, title } = getMovieIndexByTitle(MOVIES_IN_LIST, searchTitle); 185 | 186 | return { 187 | userId, 188 | rating, 189 | movieId: id, 190 | title, 191 | }; 192 | } 193 | 194 | export function sliceAndDice(recommendations, MOVIES_BY_ID, count, onlyTitle) { 195 | recommendations = recommendations.filter(recommendation => MOVIES_BY_ID[recommendation.movieId]); 196 | 197 | recommendations = onlyTitle 198 | ? recommendations.map(mr => ({ title: MOVIES_BY_ID[mr.movieId].title, score: mr.score })) 199 | : recommendations.map(mr => ({ movie: MOVIES_BY_ID[mr.movieId], score: mr.score })); 200 | 201 | return recommendations 202 | .slice(0, count); 203 | } 204 | 205 | export function softEval(string, escape) { 206 | if (!string) { 207 | return escape; 208 | } 209 | 210 | try { 211 | return eval(string); 212 | } catch (e) { 213 | return escape; 214 | } 215 | } -------------------------------------------------------------------------------- /src/preparation/movies.js: -------------------------------------------------------------------------------- 1 | import natural from 'natural'; 2 | 3 | natural.PorterStemmer.attach(); 4 | 5 | function prepareMovies(moviesMetaData, moviesKeywords) { 6 | console.log('Preparing Movies ... \n'); 7 | 8 | // Pre-processing movies for unified data structure 9 | // E.g. get overview property into same shape as studio property 10 | console.log('(1) Zipping Movies'); 11 | let MOVIES_IN_LIST = zip(moviesMetaData, moviesKeywords); 12 | MOVIES_IN_LIST = withTokenizedAndStemmed(MOVIES_IN_LIST, 'overview'); 13 | MOVIES_IN_LIST = fromArrayToMap(MOVIES_IN_LIST, 'overview'); 14 | 15 | // Keep a map of movies for later reference 16 | let MOVIES_BY_ID = MOVIES_IN_LIST.reduce(byId, {}); 17 | 18 | console.log('(2) Creating Dictionaries'); 19 | // Preparing dictionaries for feature extraction 20 | let DICTIONARIES = prepareDictionaries(MOVIES_IN_LIST); 21 | 22 | // Feature Extraction: 23 | // Map different types to numerical values (e.g. adult to 0 or 1) 24 | // Map dictionaries to partial feature vectors 25 | console.log('(3) Extracting Features'); 26 | let X = MOVIES_IN_LIST.map(toFeaturizedMovies(DICTIONARIES)); 27 | 28 | // Extract a couple of valuable coefficients 29 | // Can be used in a later stage (e.g. feature scaling) 30 | console.log('(4) Calculating Coefficients'); 31 | let { means, ranges } = getCoefficients(X); 32 | 33 | // Synthesize Features: 34 | // Missing features (such as budget, release, revenue) 35 | // can be synthesized with the mean of the features 36 | console.log('(5) Synthesizing Features'); 37 | X = synthesizeFeatures(X, means, [0, 1, 2, 3, 4, 5, 6]); 38 | 39 | // Feature Scaling: 40 | // Normalize features based on mean and range vectors 41 | console.log('(6) Scaling Features \n'); 42 | X = scaleFeatures(X, means, ranges); 43 | 44 | return { 45 | MOVIES_BY_ID, 46 | MOVIES_IN_LIST, 47 | X, 48 | }; 49 | } 50 | 51 | export function byId(moviesById, movie) { 52 | moviesById[movie.id] = movie; 53 | return moviesById; 54 | } 55 | 56 | export function prepareDictionaries(movies) { 57 | let genresDictionary = toDictionary(movies, 'genres'); 58 | let studioDictionary = toDictionary(movies, 'studio'); 59 | let keywordsDictionary = toDictionary(movies, 'keywords'); 60 | let overviewDictionary = toDictionary(movies, 'overview'); 61 | 62 | // Customize the threshold to your own needs 63 | // Depending on threshold you get a different size of a feature vector for a movie 64 | // The following case attempts to keep feature vector small for computational efficiency 65 | genresDictionary = filterByThreshold(genresDictionary, 1); 66 | studioDictionary = filterByThreshold(studioDictionary, 75); 67 | keywordsDictionary = filterByThreshold(keywordsDictionary, 150); 68 | overviewDictionary = filterByThreshold(overviewDictionary, 750); 69 | 70 | return { 71 | genresDictionary, 72 | studioDictionary, 73 | keywordsDictionary, 74 | overviewDictionary, 75 | }; 76 | } 77 | 78 | export function scaleFeatures(X, means, ranges) { 79 | return X.map((row) => { 80 | return row.map((feature, key) => { 81 | return (feature - means[key]) / ranges[key]; 82 | }); 83 | }); 84 | }; 85 | 86 | export function synthesizeFeatures(X, means, featureIndexes) { 87 | return X.map((row) => { 88 | return row.map((feature, key) => { 89 | if (featureIndexes.includes(key) && feature === 'undefined') { 90 | return means[key]; 91 | } else { 92 | return feature; 93 | } 94 | }); 95 | }); 96 | } 97 | 98 | export function getCoefficients(X) { 99 | const M = X.length; 100 | 101 | const initC = { 102 | sums: [], 103 | mins: [], 104 | maxs: [], 105 | }; 106 | 107 | const helperC = X.reduce((result, row) => { 108 | if (row.includes('undefined')) { 109 | return result; 110 | } 111 | 112 | return { 113 | sums: row.map((feature, key) => { 114 | if (result.sums[key]) { 115 | return result.sums[key] + feature; 116 | } else { 117 | return feature; 118 | } 119 | }), 120 | mins: row.map((feature, key) => { 121 | if (result.mins[key] === 'undefined') { 122 | return result.mins[key]; 123 | } 124 | 125 | if (result.mins[key] <= feature) { 126 | return result.mins[key]; 127 | } else { 128 | return feature; 129 | } 130 | }), 131 | maxs: row.map((feature, key) => { 132 | if (result.maxs[key] === 'undefined') { 133 | return result.maxs[key]; 134 | } 135 | 136 | if (result.maxs[key] >= feature) { 137 | return result.maxs[key]; 138 | } else { 139 | return feature; 140 | } 141 | }), 142 | }; 143 | }, initC); 144 | 145 | const means = helperC.sums.map(value => value / M); 146 | const ranges = helperC.mins.map((value, key) => helperC.maxs[key] - value); 147 | 148 | return { ranges, means }; 149 | } 150 | 151 | export function toFeaturizedMovies(dictionaries) { 152 | return function toFeatureVector(movie) { 153 | const featureVector = []; 154 | 155 | featureVector.push(toFeaturizedNumber(movie, 'budget')); 156 | featureVector.push(toFeaturizedNumber(movie, 'popularity')); 157 | featureVector.push(toFeaturizedNumber(movie, 'revenue')); 158 | featureVector.push(toFeaturizedNumber(movie, 'runtime')); 159 | featureVector.push(toFeaturizedNumber(movie, 'voteAverage')); 160 | featureVector.push(toFeaturizedNumber(movie, 'voteCount')); 161 | featureVector.push(toFeaturizedRelease(movie)); 162 | 163 | featureVector.push(toFeaturizedAdult(movie)); 164 | featureVector.push(toFeaturizedHomepage(movie)); 165 | featureVector.push(toFeaturizedLanguage(movie)); 166 | 167 | featureVector.push(...toFeaturizedFromDictionary(movie, dictionaries.genresDictionary, 'genres')); 168 | featureVector.push(...toFeaturizedFromDictionary(movie, dictionaries.overviewDictionary, 'overview')); 169 | featureVector.push(...toFeaturizedFromDictionary(movie, dictionaries.studioDictionary, 'studio')); 170 | featureVector.push(...toFeaturizedFromDictionary(movie, dictionaries.keywordsDictionary, 'keywords')); 171 | 172 | return featureVector; 173 | } 174 | } 175 | 176 | export function toFeaturizedRelease(movie) { 177 | return movie.release ? Number((movie.release).slice(0, 4)) : 'undefined'; 178 | } 179 | 180 | export function toFeaturizedAdult(movie) { 181 | return movie.adult === 'False' ? 0 : 1; 182 | } 183 | 184 | export function toFeaturizedHomepage(movie) { 185 | return movie.homepage ? 0 : 1; 186 | } 187 | 188 | export function toFeaturizedLanguage(movie) { 189 | return movie.language === 'en' ? 1 : 0; 190 | } 191 | 192 | export function toFeaturizedFromDictionary(movie, dictionary, property) { 193 | // Fallback, because not all movies have associated keywords 194 | const propertyIds = (movie[property] || []).map(value => value.id); 195 | const isIncluded = (value) => propertyIds.includes(value.id) ? 1 : 0; 196 | return dictionary.map(isIncluded); 197 | } 198 | 199 | export function toFeaturizedNumber(movie, property) { 200 | const number = Number(movie[property]); 201 | 202 | // Fallback for NaN 203 | if (number > 0 || number === 0) { 204 | return number; 205 | } else { 206 | return 'undefined'; 207 | } 208 | } 209 | 210 | // Refactored in favor of generic function 211 | 212 | // function toFeaturizedGenres(movie, genresDictionary) { 213 | // const movieGenreIds = movie.genres.map(genre => genre.id); 214 | // const isGenre = (genre) => movieGenreIds.includes(genre.id) ? 1 : 0; 215 | // return genresDictionary.map(isGenre); 216 | // } 217 | 218 | // function getFeatureScalingCoefficients(movies, 'budget') { 219 | // const { range, mean } = movies.reduce((result, value, property) => { 220 | 221 | // }, {}); 222 | 223 | // return { range, mean }; 224 | // } 225 | 226 | // function toFeaturizedLanguageProperty(movie) { 227 | // return 0; 228 | // } 229 | 230 | export function fromArrayToMap(array, property) { 231 | return array.map((value) => { 232 | const transformed = value[property].map((value) => ({ 233 | id: value, 234 | name: value, 235 | })); 236 | 237 | return { ...value, [property]: transformed }; 238 | }); 239 | } 240 | 241 | export function withTokenizedAndStemmed(array, property) { 242 | return array.map((value) => ({ 243 | ...value, 244 | [property]: value[property].tokenizeAndStem(), 245 | })); 246 | } 247 | 248 | export function filterByThreshold(dictionary, threshold) { 249 | return Object.keys(dictionary) 250 | .filter(key => dictionary[key].count > threshold) 251 | .map(key => dictionary[key]); 252 | } 253 | 254 | export function toDictionary(array, property) { 255 | const dictionary = {}; 256 | 257 | array.forEach((value) => { 258 | // Fallback for null value after refactoring 259 | (value[property] || []).forEach((innerValue) => { 260 | if (!dictionary[innerValue.id]) { 261 | dictionary[innerValue.id] = { 262 | ...innerValue, 263 | count: 1, 264 | }; 265 | } else { 266 | dictionary[innerValue.id] = { 267 | ...dictionary[innerValue.id], 268 | count: dictionary[innerValue.id].count + 1, 269 | } 270 | } 271 | }); 272 | }); 273 | 274 | return dictionary; 275 | } 276 | 277 | // Refactored in favor of toDictionary 278 | 279 | // export function toGenresDictionary(movies) { 280 | // const genresDictionary = {}; 281 | 282 | // movies.forEach((movie) => { 283 | // movie.genres.forEach((genre) => { 284 | // if (!genresDictionary[genre.id]) { 285 | // genresDictionary[genre.id] = { 286 | // name: genre.name, 287 | // count: 1, 288 | // }; 289 | // } else { 290 | // genresDictionary[genre.id] = { 291 | // name: genre.name, 292 | // count: genresDictionary[genre.id].count + 1, 293 | // } 294 | // } 295 | // }); 296 | // }); 297 | 298 | // return genresDictionary; 299 | // } 300 | 301 | export function zip(movies, keywords) { 302 | return Object.keys(movies).map(mId => ({ 303 | ...movies[mId], 304 | ...keywords[mId], 305 | })); 306 | } 307 | 308 | export default prepareMovies; -------------------------------------------------------------------------------- /src/preparation/ratings.js: -------------------------------------------------------------------------------- 1 | function prepareRatings(ratings) { 2 | console.log('Preparing Ratings ... \n'); 3 | 4 | const ratingCountsByMovie = getRatingCountsByMovie(ratings); 5 | const ratingCountsByUser = getRatingCountsByUser(ratings); 6 | 7 | const POPULARITY_TRESHOLD = { 8 | movieRatings: 50, // be careful not to exclude the movies of your focused user 9 | userRatings: 5, // be careful not to exclude your focused user 10 | }; 11 | 12 | console.log('(1) Group ratings by user'); 13 | const ratingsGroupedByUser = getRatingsGroupedByUser( 14 | ratings, 15 | ratingCountsByMovie, 16 | ratingCountsByUser, 17 | POPULARITY_TRESHOLD 18 | ); 19 | 20 | console.log('(2) Group ratings by movie \n'); 21 | const ratingsGroupedByMovie = getRatingsGroupedByMovie( 22 | ratings, 23 | ratingCountsByMovie, 24 | ratingCountsByUser, 25 | POPULARITY_TRESHOLD 26 | ); 27 | 28 | return { ratingsGroupedByUser, ratingsGroupedByMovie }; 29 | } 30 | 31 | export function getRatingCountsByUser(ratings) { 32 | return ratings.reduce((result, value) => { 33 | const { userId, rating } = value; 34 | 35 | if (!result[userId]) { 36 | result[userId] = 0; 37 | } 38 | 39 | result[userId]++; 40 | 41 | return result; 42 | }, {}); 43 | } 44 | 45 | export function getRatingCountsByMovie(ratings) { 46 | return ratings.reduce((result, value) => { 47 | const { movieId, rating } = value; 48 | 49 | if (!result[movieId]) { 50 | result[movieId] = 0; 51 | } 52 | 53 | result[movieId]++; 54 | 55 | return result; 56 | }, {}); 57 | } 58 | 59 | export function getRatingsGroupedByMovie(ratings, ratingCountsByMovie, ratingCountsByUser, popularityThreshold) { 60 | const { movieRatings, userRatings } = popularityThreshold; 61 | 62 | return ratings.reduce((result, value) => { 63 | const { userId, movieId, rating, timestamp } = value; 64 | 65 | if (ratingCountsByMovie[movieId] < movieRatings || ratingCountsByUser[userId] < userRatings) { 66 | return result; 67 | } 68 | 69 | if (!result[movieId]) { 70 | result[movieId] = {}; 71 | } 72 | 73 | result[movieId][userId] = { rating: Number(rating), timestamp }; 74 | 75 | return result; 76 | }, {}); 77 | } 78 | 79 | export function getRatingsGroupedByUser(ratings, ratingCounts, popularity) { 80 | return ratings.reduce((result, value) => { 81 | const { userId, movieId, rating } = value; 82 | 83 | if (ratingCounts[movieId] < popularity) { 84 | return result; 85 | } 86 | 87 | if (!result[userId]) { 88 | result[userId] = {}; 89 | } 90 | 91 | result[userId][movieId] = { rating: Number(rating) }; 92 | 93 | return result; 94 | }, {}); 95 | } 96 | 97 | export default prepareRatings; -------------------------------------------------------------------------------- /src/strategies/collaborativeFiltering.js: -------------------------------------------------------------------------------- 1 | // Read https://buildingrecommenders.wordpress.com/2015/11/18/overview-of-recommender-algorithms-part-2/ 2 | // Watch https://www.youtube.com/watch?v=h9gpufJFF-0 3 | // Read https://datascience.stackexchange.com/questions/2598/item-based-and-user-based-recommendation-difference-in-mahout 4 | 5 | import math from 'mathjs'; 6 | 7 | import { 8 | getCosineSimilarityRowVector, 9 | sortByScore, 10 | } from './common'; 11 | 12 | export function predictWithCfUserBased(ratingsGroupedByUser, ratingsGroupedByMovie, userId) { 13 | const { userItem } = getMatrices(ratingsGroupedByUser, ratingsGroupedByMovie, userId); 14 | const { matrix, movieIds, userIndex } = userItem; 15 | 16 | const matrixNormalized = meanNormalizeByRowVector(matrix); 17 | const userRatingsRowVector = matrixNormalized[userIndex]; 18 | 19 | const cosineSimilarityRowVector = getCosineSimilarityRowVector(matrixNormalized, userIndex); 20 | 21 | const predictedRatings = userRatingsRowVector.map((rating, movieIndex) => { 22 | const movieId = movieIds[movieIndex]; 23 | 24 | const movieRatingsRowVector = getMovieRatingsRowVector(matrixNormalized, movieIndex); 25 | 26 | let score; 27 | if (rating === 0) { 28 | score = getPredictedRating(movieRatingsRowVector, cosineSimilarityRowVector); 29 | } else { 30 | score = rating 31 | } 32 | 33 | return { score, movieId }; 34 | }); 35 | 36 | return sortByScore(predictedRatings); 37 | } 38 | 39 | export function predictWithCfItemBased(ratingsGroupedByUser, ratingsGroupedByMovie, userId) { 40 | const { itemUser } = getMatrices(ratingsGroupedByUser, ratingsGroupedByMovie, userId); 41 | const { matrix, movieIds, userIndex } = itemUser; 42 | 43 | const matrixNormalized = meanNormalizeByRowVector(matrix); 44 | const userRatingsRowVector = getUserRatingsRowVector(matrixNormalized, userIndex); 45 | 46 | const predictedRatings = userRatingsRowVector.map((rating, movieIndex) => { 47 | const movieId = movieIds[movieIndex]; 48 | 49 | const cosineSimilarityRowVector = getCosineSimilarityRowVector(matrixNormalized, movieIndex); 50 | 51 | let score; 52 | if (rating === 0) { 53 | score = getPredictedRating( 54 | userRatingsRowVector, 55 | cosineSimilarityRowVector 56 | ); 57 | } else { 58 | score = rating; 59 | } 60 | 61 | return { score, movieId }; 62 | }); 63 | 64 | return sortByScore(predictedRatings); 65 | } 66 | 67 | function getPredictedRating(ratingsRowVector, cosineSimilarityRowVector) { 68 | const N = 5; 69 | const neighborSelection = cosineSimilarityRowVector 70 | // keep track of rating and similarity 71 | .map((similarity, index) => ({ similarity, rating: ratingsRowVector[index] })) 72 | // only neighbors with a rating 73 | .filter(value => value.rating !== 0) 74 | // most similar neighbors on top 75 | .sort((a, b) => b.similarity - a.similarity) 76 | // N neighbors 77 | .slice(0, N); 78 | 79 | const numerator = neighborSelection.reduce((result, value) => { 80 | return result + value.similarity * value.rating; 81 | }, 0); 82 | 83 | const denominator = neighborSelection.reduce((result, value) => { 84 | return result + math.pow(value.similarity, 2); 85 | }, 0); 86 | 87 | return numerator / math.sqrt(denominator); 88 | } 89 | 90 | function getUserRatingsRowVector(itemBasedMatrix, userIndex) { 91 | return itemBasedMatrix.map(itemRatings => { 92 | return itemRatings[userIndex]; 93 | }); 94 | } 95 | 96 | function getMovieRatingsRowVector(userBasedMatrix, movieIndex) { 97 | return userBasedMatrix.map(userRatings => { 98 | return userRatings[movieIndex]; 99 | }); 100 | } 101 | 102 | function meanNormalizeByRowVector(matrix) { 103 | return matrix.map((rowVector) => { 104 | return rowVector.map(cell => { 105 | return cell !== 0 ? cell - getMean(rowVector) : cell; 106 | }); 107 | }); 108 | } 109 | 110 | function getMean(rowVector) { 111 | const valuesWithoutZeroes = rowVector.filter(cell => cell !== 0); 112 | return valuesWithoutZeroes.length ? math.mean(valuesWithoutZeroes) : 0; 113 | } 114 | 115 | export function getMatrices(ratingsGroupedByUser, ratingsGroupedByMovie, uId) { 116 | const itemUser = Object.keys(ratingsGroupedByMovie).reduce((result, movieId) => { 117 | const rowVector = Object.keys(ratingsGroupedByUser).map((userId, userIndex) => { 118 | 119 | if (userId == uId) { 120 | result.userIndex = userIndex; 121 | } 122 | 123 | return getConditionalRating(ratingsGroupedByMovie, movieId, userId); 124 | }); 125 | 126 | result.matrix.push(rowVector); 127 | result.movieIds.push(movieId); 128 | 129 | return result; 130 | }, { matrix: [], movieIds: [], userIndex: null }); 131 | 132 | const userItem = Object.keys(ratingsGroupedByUser).reduce((result, userId, userIndex) => { 133 | const rowVector = Object.keys(ratingsGroupedByMovie).map(movieId => { 134 | return getConditionalRating(ratingsGroupedByUser, userId, movieId); 135 | }); 136 | 137 | result.matrix.push(rowVector); 138 | 139 | if (userId == uId) { 140 | result.userIndex = userIndex; 141 | } 142 | 143 | return result; 144 | }, { matrix: [], movieIds: Object.keys(ratingsGroupedByMovie), userIndex: null }); 145 | 146 | return { itemUser, userItem }; 147 | } 148 | 149 | function getConditionalRating(value, primaryKey, secondaryKey) { 150 | if (!value[primaryKey]) { 151 | return 0; 152 | } 153 | 154 | if (!value[primaryKey][secondaryKey]) { 155 | return 0; 156 | } 157 | 158 | return value[primaryKey][secondaryKey].rating; 159 | } -------------------------------------------------------------------------------- /src/strategies/common.js: -------------------------------------------------------------------------------- 1 | import similarity from 'compute-cosine-similarity'; 2 | 3 | export function sortByScore(recommendation) { 4 | return recommendation.sort((a, b) => b.score - a.score); 5 | } 6 | 7 | // X x 1 row vector based on similarities of movies 8 | // 1 equals similar, -1 equals not similar, 0 equals orthogonal 9 | // Whole matrix is too computational expensive for 45.000 movies 10 | // https://en.wikipedia.org/wiki/Cosine_similarity 11 | export function getCosineSimilarityRowVector(matrix, index) { 12 | return matrix.map((rowRelative, i) => { 13 | return similarity(matrix[index], matrix[i]); 14 | }); 15 | } 16 | 17 | export function getMovieIndexByTitle(MOVIES_IN_LIST, query) { 18 | const index = MOVIES_IN_LIST.map(movie => movie.title).indexOf(query); 19 | 20 | if (!index) { 21 | throw new Error('Movie not found'); 22 | } 23 | 24 | const { title, id } = MOVIES_IN_LIST[index]; 25 | return { index, title, id }; 26 | } -------------------------------------------------------------------------------- /src/strategies/contentBased.js: -------------------------------------------------------------------------------- 1 | import { getCosineSimilarityRowVector, sortByScore, getMovieIndexByTitle } from './common'; 2 | 3 | function predictWithContentBased(X, MOVIES_IN_LIST, title) { 4 | const { index } = getMovieIndexByTitle(MOVIES_IN_LIST, title); 5 | 6 | // Compute similarities based on input movie 7 | const cosineSimilarityRowVector = getCosineSimilarityRowVector(X, index); 8 | 9 | // Enrich the vector to convey all information 10 | // Use references from before which we kept track of 11 | const contentBasedRecommendation = cosineSimilarityRowVector 12 | .map((value, key) => ({ 13 | score: value, 14 | movieId: MOVIES_IN_LIST[key].id, 15 | })); 16 | 17 | return sortByScore(contentBasedRecommendation); 18 | } 19 | 20 | export default predictWithContentBased; -------------------------------------------------------------------------------- /src/strategies/linearRegression.js: -------------------------------------------------------------------------------- 1 | import math from 'mathjs'; 2 | 3 | import { sortByScore } from './common'; 4 | 5 | const LEARNING_RATE = 0.03; 6 | const LEARNING_ITERATIONS = 750; 7 | 8 | function predictWithLinearRegression(X, MOVIES_IN_LIST, ratings) { 9 | // Add intercept term 10 | const ones = Array(X.length).fill().map((v, i) => [1]); 11 | X = math.concat(ones, X); 12 | 13 | const init = { 14 | training: { 15 | X: [], 16 | y: [], 17 | }, 18 | // Not a real test set 19 | // Because of missing labels 20 | test: { 21 | X: [], 22 | references: [], 23 | } 24 | }; 25 | 26 | // Prepare training and test set 27 | const { training, test } = MOVIES_IN_LIST.reduce((result, movie, key) => { 28 | const hasRatedMovie = !!ratings[movie.id]; 29 | if (hasRatedMovie) { 30 | result.training.X.push(X[key]); 31 | result.training.y.push([ratings[movie.id].rating]); 32 | } else { 33 | result.test.X.push(X[key]); 34 | // Keep a reference to map the predictions later to movies 35 | result.test.references.push(movie.id); 36 | } 37 | 38 | return result; 39 | }, init); 40 | 41 | // Train theta paramaters 42 | let m = training.X[0].length; 43 | let theta = Array(m).fill().map((v, i) => [0]); 44 | theta = gradientDescent( 45 | training.X, 46 | training.y, 47 | theta, 48 | LEARNING_RATE, 49 | LEARNING_ITERATIONS 50 | ); 51 | 52 | // Predict all ratings 53 | let predictedRatings = getPredictedRatings(theta, test.X); 54 | 55 | // Enrich the vector to convey all information 56 | // Use references from before which we kept track of 57 | predictedRatings = predictedRatings.map((rating, key) => ({ 58 | score: rating[0], 59 | movieId: test.references[key], 60 | })); 61 | 62 | return sortByScore(predictedRatings); 63 | } 64 | 65 | export function gradientDescent(X, y, theta, ALPHA, ITERATIONS) { 66 | const m = y.length; 67 | 68 | for (let i = 0; i < ITERATIONS; i++) { 69 | theta = math.eval(`theta - ALPHA / m * ((X * theta - y)' * X)'`, { 70 | theta, 71 | ALPHA, 72 | m, 73 | X, 74 | y, 75 | }); 76 | 77 | if (i % 50 === 0) { 78 | const cost = computeCost(X, y, theta); 79 | console.log(`Cost after ${i} of trained ${ITERATIONS}: ${cost}`); 80 | } 81 | } 82 | console.log(`\n`); 83 | 84 | return theta; 85 | } 86 | 87 | export function getPredictedRatings(theta, X) { 88 | return math.eval(`X * theta`, { 89 | theta, 90 | X, 91 | }) 92 | } 93 | 94 | export function computeCost(X, y, theta) { 95 | let m = y.length; 96 | 97 | let predictions = math.eval('X * theta', { 98 | X, 99 | theta, 100 | }); 101 | 102 | let sqrErrors = math.eval('(predictions - y).^2', { 103 | predictions, 104 | y, 105 | }); 106 | 107 | let J = math.eval(`1 / (2 * m) * sum(sqrErrors)`, { 108 | m, 109 | sqrErrors, 110 | }); 111 | 112 | return J; 113 | } 114 | 115 | export default predictWithLinearRegression; --------------------------------------------------------------------------------