/** check whether the explicit user/item filter works */
@Test
public void testCompleteJobWithFiltering() throws Exception {
File inputFile = getTestTempFile("prefs.txt");
File userFile = getTestTempFile("users.txt");
File filterFile = getTestTempFile("filter.txt");
File outputDir = getTestTempDir("output");
outputDir.delete();
File tmpDir = getTestTempDir("tmp");
writeLines(
inputFile, "1,1,5", "1,2,5", "1,3,2", "2,1,2", "2,3,3", "2,4,5", "3,2,5", "3,4,3", "4,1,3",
"4,4,5");
/* only compute recommendations for the donkey */
writeLines(userFile, "4");
/* do not recommend the hotdog for the donkey */
writeLines(filterFile, "4,2");
RecommenderJob recommenderJob = new RecommenderJob();
Configuration conf = new Configuration();
conf.set("mapred.input.dir", inputFile.getAbsolutePath());
conf.set("mapred.output.dir", outputDir.getAbsolutePath());
conf.setBoolean("mapred.output.compress", false);
recommenderJob.setConf(conf);
recommenderJob.run(
new String[] {
"--tempDir",
tmpDir.getAbsolutePath(),
"--similarityClassname",
DistributedTanimotoCoefficientVectorSimilarity.class.getName(),
"--numRecommendations",
"1",
"--usersFile",
userFile.getAbsolutePath(),
"--filterFile",
filterFile.getAbsolutePath()
});
Map<Long, List<RecommendedItem>> recommendations =
readRecommendations(new File(outputDir, "part-r-00000"));
assertEquals(1, recommendations.size());
assertTrue(recommendations.containsKey(4L));
assertEquals(1, recommendations.get(4L).size());
/* berries should have been recommended to the donkey */
RecommendedItem recommendedItem = recommendations.get(4L).get(0);
assertEquals(3L, recommendedItem.getItemID());
assertEquals(3.5, recommendedItem.getValue(), 0.05);
}
public static void main(String[] args)
throws TasteException, UnknownHostException, MongoException {
model =
new MongoDBDataModel(
"127.0.0.1",
27017,
"right-channel",
"ratings",
false,
false,
null,
"user_id",
"movie_id",
"rating",
MongoDBDataModel.DEFAULT_MONGO_MAP_COLLECTION);
ItemSimilarity similarity = new PearsonCorrelationSimilarity(model);
Recommender recommender = new BiasedItemBasedRecommender(model, similarity);
IDRescorer rescorer = new OverallRescorer();
List<RecommendedItem> recommendations =
recommender.recommend(
Long.parseLong(
model.fromIdToLong(
new ObjectId("518ce9df4597b5adead4b61d").toStringMongod(), false)),
1000,
rescorer);
Mongo mongoDB = new Mongo("127.0.0.1", 27017);
DB db = mongoDB.getDB("right-channel");
DBCollection recommendationCollection = db.getCollection("recommendations");
BasicDBObject document = new BasicDBObject();
document.put("user_id", new ObjectId("518ce9df4597b5adead4b61d"));
recommendationCollection.remove(document);
for (RecommendedItem recommendation : recommendations) {
long movieIdLong = recommendation.getItemID();
String movieIdString = model.fromLongToId(movieIdLong);
ObjectId movieIdObject = new ObjectId(movieIdString);
double rating = recommendation.getValue();
BasicDBObject prediction = new BasicDBObject();
Object userIdObject = new ObjectId("518ce9df4597b5adead4b61d");
prediction.put("user_id", userIdObject);
prediction.put("movie_id", movieIdObject);
prediction.put("rating", rating);
recommendationCollection.insert(prediction);
System.out.println(rating);
}
}
public static void main(String[] args) throws IOException, TasteException {
String file = "datafile/item.csv";
DataModel model = new FileDataModel(new File(file));
UserSimilarity user = new EuclideanDistanceSimilarity(model);
NearestNUserNeighborhood neighbor = new NearestNUserNeighborhood(NEIGHBORHOOD_NUM, user, model);
Recommender r = new GenericUserBasedRecommender(model, neighbor, user);
LongPrimitiveIterator iter = model.getUserIDs();
while (iter.hasNext()) {
long uid = iter.nextLong();
List<RecommendedItem> list = r.recommend(uid, RECOMMENDER_NUM);
System.out.printf("uid:%s", uid);
for (RecommendedItem ritem : list) {
System.out.printf("(%s,%f)", ritem.getItemID(), ritem.getValue());
}
System.out.println();
}
}
@Test
public void testTopItems() throws Exception {
long[] ids = new long[100];
for (int i = 0; i < 100; i++) {
ids[i] = i;
}
LongPrimitiveIterator possibleItemIds = new LongPrimitiveArrayIterator(ids);
TopItems.Estimator<Long> estimator =
new TopItems.Estimator<Long>() {
@Override
public double estimate(Long thing) {
return thing;
}
};
List<RecommendedItem> topItems = TopItems.getTopItems(10, possibleItemIds, null, estimator);
int gold = 99;
for (RecommendedItem topItem : topItems) {
assertEquals(gold, topItem.getItemID());
assertEquals(gold--, topItem.getValue(), 0.01);
}
}
@Override
protected void map(IntWritable key, VectorWritable value, Context context)
throws IOException, InterruptedException {
Vector v = value.get();
Iterator<Vector.Element> iter = v.iterateNonZero();
TopK<RecommendedItem> topKItems =
new TopK<RecommendedItem>(recommendationsPerUser, BY_PREFERENCE_VALUE);
while (iter.hasNext()) {
Vector.Element e = iter.next();
topKItems.offer(new GenericRecommendedItem(e.index(), (float) e.get()));
}
List<RecommendedItem> recommendedItems =
Lists.newArrayListWithExpectedSize(recommendationsPerUser);
for (RecommendedItem topItem : topKItems.retrieve()) {
recommendedItems.add(new GenericRecommendedItem(topItem.getItemID(), topItem.getValue()));
}
if (recommendedItems.size() > 0) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < recommendedItems.size(); i++) {
RecommendedItem item = recommendedItems.get(i);
if (i != 0) {
sb.append(DELIMETER);
}
sb.append(item.getItemID()).append(DELIMETER).append(item.getValue());
}
outValue.set(sb.toString());
context.write(key, outValue);
}
}
public static void main(String[] args) throws TasteException, MongoException, IOException {
String ml10mFolder = "/home/yapianyu/Desktop/movielens/ml-10M100K/refinement/";
String ratingFilePath = ml10mFolder + "ratings.dat";
String movieFilePath = ml10mFolder + "movies.dat";
for (String line : new FileLineIterable(new File(movieFilePath), false)) {
String[] fields = line.split("::");
long id = Long.parseLong(fields[0]);
long year =
Long.parseLong(fields[1].substring(fields[1].length() - 5, fields[1].length() - 1));
String title = fields[3];
try {
double rating = Double.parseDouble(fields[4]);
mid2rating.put(id, rating);
} catch (Exception e) {
mid2rating.put(id, Double.NaN);
}
mid2year.put(id, year);
mid2title.put(id, title);
}
DataModel model = new FileDataModel(new File(ratingFilePath));
ItemSimilarity similarity = new PearsonCorrelationSimilarity(model);
Recommender recommender = new BiasedItemBasedRecommender(model, similarity);
IDRescorer rescorer = new OverallRescorer();
List<RecommendedItem> recommendations = recommender.recommend(72000, 1000, rescorer);
for (RecommendedItem recommendation : recommendations) {
long mid = recommendation.getItemID();
System.out.println(
String.format(
"%.3f\t%d\t%.1f\t%s(%d)",
recommendation.getValue(),
mid2year.get(mid),
mid2rating.get(mid),
mid2title.get(mid),
mid));
}
}
@Test
public void testTopItemsRandom() throws Exception {
long[] ids = new long[100];
for (int i = 0; i < 100; i++) {
ids[i] = i;
}
LongPrimitiveIterator possibleItemIds = new LongPrimitiveArrayIterator(ids);
final Random random = RandomUtils.getRandom();
TopItems.Estimator<Long> estimator =
new TopItems.Estimator<Long>() {
@Override
public double estimate(Long thing) {
return random.nextDouble();
}
};
List<RecommendedItem> topItems = TopItems.getTopItems(10, possibleItemIds, null, estimator);
assertEquals(10, topItems.size());
double last = 2.0;
for (RecommendedItem topItem : topItems) {
assertTrue(topItem.getValue() <= last);
last = topItem.getItemID();
}
}
public static void main(String args[]) {
try {
// Loading the DATA;
DataModel dm =
new FileDataModel(
new File(
"C:\\Users\\bryce\\Course Work\\3. Full Summer\\Big Data\\Final Project\\Yelp\\FINAL CODE\\Mahout\\data\\busirec_new.csv"));
// We use the below line to relate businesses.
// ItemSimilarity sim = new LogLikelihoodSimilarity(dm);
TanimotoCoefficientSimilarity sim = new TanimotoCoefficientSimilarity((dm));
// Using the below line get recommendations
GenericItemBasedRecommender recommender = new GenericItemBasedRecommender(dm, sim);
// Looping through every business.
for (LongPrimitiveIterator items = dm.getItemIDs(); items.hasNext(); ) {
long itemId = items.nextLong();
// For each business we recommend 3 businesses.
List<RecommendedItem> recommendations = recommender.mostSimilarItems(itemId, 2);
for (RecommendedItem recommendation : recommendations) {
System.out.println(
itemId + "," + recommendation.getItemID() + "," + recommendation.getValue());
}
}
} catch (IOException | TasteException e) {
System.out.println(e);
}
}
public static void main(String[] args)
throws FileNotFoundException, TasteException, IOException, OptionException {
DataModel model;
model = new FileDataModel(new File("datasets/ratingsForMahout.dat"));
File movieMapFile = new File("datasets/moviesForMahout.dat");
HashMap<Long, String> movieMap = new HashMap<Long, String>();
Scanner scan = new Scanner(movieMapFile);
while (scan.hasNextLine()) {
String[] line = scan.nextLine().split("\\|");
movieMap.put(Long.parseLong(line[0]), line[1]);
}
scan.close();
UserSimilarity userSimilarity = new PearsonCorrelationSimilarity(model);
UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, userSimilarity, model);
Recommender recommender = new GenericUserBasedRecommender(model, neighborhood, userSimilarity);
Recommender cachingRecommender = new CachingRecommender(recommender);
for (LongPrimitiveIterator it = model.getUserIDs(); it.hasNext(); ) {
long userId = it.nextLong();
List<RecommendedItem> recommendations = cachingRecommender.recommend(userId, 10);
if (recommendations.size() == 0) {
System.out.println("User " + userId + ": no recommendations");
}
for (RecommendedItem recommendedItem : recommendations) {
System.out.println(
"User "
+ userId
+ ": "
+ movieMap.get(recommendedItem.getItemID())
+ "; value="
+ recommendedItem.getValue());
}
}
}
/** small integration test for boolean data */
@Test
public void testCompleteJobBoolean() throws Exception {
File inputFile = getTestTempFile("prefs.txt");
File outputDir = getTestTempDir("output");
outputDir.delete();
File tmpDir = getTestTempDir("tmp");
File usersFile = getTestTempFile("users.txt");
writeLines(usersFile, "3");
writeLines(inputFile, "1,1", "1,2", "1,3", "2,1", "2,3", "2,4", "3,2", "3,4", "4,1", "4,4");
RecommenderJob recommenderJob = new RecommenderJob();
Configuration conf = new Configuration();
conf.set("mapred.input.dir", inputFile.getAbsolutePath());
conf.set("mapred.output.dir", outputDir.getAbsolutePath());
conf.setBoolean("mapred.output.compress", false);
recommenderJob.setConf(conf);
recommenderJob.run(
new String[] {
"--tempDir",
tmpDir.getAbsolutePath(),
"--similarityClassname",
DistributedCooccurrenceVectorSimilarity.class.getName(),
"--booleanData",
"true",
"--usersFile",
usersFile.getAbsolutePath()
});
Map<Long, List<RecommendedItem>> recommendations =
readRecommendations(new File(outputDir, "part-r-00000"));
List<RecommendedItem> recommendedToCow = recommendations.get(3L);
assertEquals(2, recommendedToCow.size());
RecommendedItem item1 = recommendedToCow.get(0);
RecommendedItem item2 = recommendedToCow.get(1);
assertEquals(1L, item1.getItemID());
assertEquals(3L, item2.getItemID());
/* predicted pref must be the sum of similarities:
* item1: coocc(burger, hotdog) + coocc(burger, icecream) = 3
* item2: coocc(berries, hotdog) + coocc(berries, icecream) = 2 */
assertEquals(3, item1.getValue(), 0.05);
assertEquals(2, item2.getValue(), 0.05);
}
/**
* small integration test that runs the full job
*
* <p>As a tribute to http://www.slideshare.net/srowen/collaborative-filtering-at-scale, we
* recommend people food to animals in this test :)
*
* <pre>
*
* user-item-matrix
*
* burger hotdog berries icecream
* dog 5 5 2 -
* rabbit 2 - 3 5
* cow - 5 - 3
* donkey 3 - - 5
*
*
* item-item-similarity-matrix (tanimoto-coefficient of the item-vectors of the user-item-matrix)
*
* burger hotdog berries icecream
* burger - 0.25 0.66 0.5
* hotdog 0.25 - 0.33 0.25
* berries 0.66 0.33 - 0.25
* icecream 0.5 0.25 0.25 -
*
*
* Prediction(dog, icecream) = (0.5 * 5 + 0.25 * 5 + 0.25 * 2 ) / (0.5 + 0.25 + 0.25) ~ 4.3
* Prediction(rabbit, hotdog) = (0.25 * 2 + 0.33 * 3 + 0.25 * 5) / (0.25 + 0.33 + 0.25) ~ 3,3
* Prediction(cow, burger) = (0.25 * 5 + 0.5 * 3) / (0.25 + 0.5) ~ 3,7
* Prediction(cow, berries) = (0.33 * 5 + 0.25 * 3) / (0.33 + 0.25) ~ 4,1
* Prediction(donkey, hotdog) = (0.25 * 3 + 0.25 * 5) / (0.25 + 0.25) ~ 4
* Prediction(donkey, berries) = (0.66 * 3 + 0.25 * 5) / (0.66 + 0.25) ~ 3,5
*
* </pre>
*/
@Test
public void testCompleteJob() throws Exception {
File inputFile = getTestTempFile("prefs.txt");
File outputDir = getTestTempDir("output");
outputDir.delete();
File tmpDir = getTestTempDir("tmp");
writeLines(
inputFile, "1,1,5", "1,2,5", "1,3,2", "2,1,2", "2,3,3", "2,4,5", "3,2,5", "3,4,3", "4,1,3",
"4,4,5");
RecommenderJob recommenderJob = new RecommenderJob();
Configuration conf = new Configuration();
conf.set("mapred.input.dir", inputFile.getAbsolutePath());
conf.set("mapred.output.dir", outputDir.getAbsolutePath());
conf.setBoolean("mapred.output.compress", false);
recommenderJob.setConf(conf);
recommenderJob.run(
new String[] {
"--tempDir",
tmpDir.getAbsolutePath(),
"--similarityClassname",
DistributedTanimotoCoefficientVectorSimilarity.class.getName(),
"--numRecommendations",
"4"
});
Map<Long, List<RecommendedItem>> recommendations =
readRecommendations(new File(outputDir, "part-r-00000"));
assertEquals(4, recommendations.size());
for (Entry<Long, List<RecommendedItem>> entry : recommendations.entrySet()) {
long userID = entry.getKey();
List<RecommendedItem> items = entry.getValue();
assertNotNull(items);
RecommendedItem item1 = items.get(0);
if (userID == 1L) {
assertEquals(1, items.size());
assertEquals(4L, item1.getItemID());
assertEquals(4.3, item1.getValue(), 0.05);
}
if (userID == 2L) {
assertEquals(1, items.size());
assertEquals(2L, item1.getItemID());
assertEquals(3.3, item1.getValue(), 0.05);
}
if (userID == 3L) {
assertEquals(2, items.size());
assertEquals(3L, item1.getItemID());
assertEquals(4.1, item1.getValue(), 0.05);
RecommendedItem item2 = items.get(1);
assertEquals(1L, item2.getItemID());
assertEquals(3.7, item2.getValue(), 0.05);
}
if (userID == 4L) {
assertEquals(2, items.size());
assertEquals(2L, item1.getItemID());
assertEquals(4.0, item1.getValue(), 0.05);
RecommendedItem item2 = items.get(1);
assertEquals(3L, item2.getItemID());
assertEquals(3.5, item2.getValue(), 0.05);
}
}
}
@Override
public int compare(RecommendedItem one, RecommendedItem two) {
return Floats.compare(one.getValue(), two.getValue());
}
@Override
public List<RecommendedItem> recommend(
long userID, int howMany, IDRescorer rescorer, boolean includeKnownItems)
throws TasteException {
Map<Long, Pair<Long, Float>> recommendedItemOccurrence = new HashMap<Long, Pair<Long, Float>>();
if (criteriaList != null && recommenderMap != null) {
for (RecommenderCriteriumEntity criterium : criteriaList) {
Recommender recommender = recommenderMap.get(criterium);
if (recommender != null) {
List<RecommendedItem> recommendedItems =
recommender.recommend(userID, howMany, rescorer, includeKnownItems);
if (recommendedItems != null) {
for (RecommendedItem recommendedItem : recommendedItems) {
Pair<Long, Float> pair = recommendedItemOccurrence.get(recommendedItem.getItemID());
if (pair == null) {
pair = new ImmutablePair<Long, Float>(1L, recommendedItem.getValue());
} else {
pair =
new ImmutablePair<Long, Float>(
pair.getLeft() + 1, (pair.getRight() + recommendedItem.getValue()) / 2);
}
recommendedItemOccurrence.put(recommendedItem.getItemID(), pair);
}
}
}
}
}
PriorityQueue<ImmutablePair<RecommendedItem, Long>> queue =
new PriorityQueue<ImmutablePair<RecommendedItem, Long>>(
10,
new Comparator<ImmutablePair<RecommendedItem, Long>>() {
@Override
public int compare(
ImmutablePair<RecommendedItem, Long> o1,
ImmutablePair<RecommendedItem, Long> o2) {
int result = -o1.getRight().compareTo(o2.getRight());
if (result == 0) {
Float v1 = o1.getLeft().getValue();
Float v2 = o2.getLeft().getValue();
result = v1.compareTo(v2);
}
return result;
}
});
for (Map.Entry<Long, Pair<Long, Float>> entry : recommendedItemOccurrence.entrySet()) {
RecommendedItem recommendedItem =
new GenericRecommendedItem(entry.getKey(), entry.getValue().getRight());
ImmutablePair<RecommendedItem, Long> pair =
new ImmutablePair<RecommendedItem, Long>(recommendedItem, entry.getValue().getLeft());
queue.add(pair);
}
List<RecommendedItem> recommendedItems = new ArrayList<RecommendedItem>();
do {
if (queue.peek() != null && queue.peek().getLeft() != null) {
recommendedItems.add(queue.poll().getLeft());
}
} while (recommendedItems.size() < howMany && !queue.isEmpty());
return recommendedItems;
}