Package org.apache.mahout.cf.taste.recommender

Examples of org.apache.mahout.cf.taste.recommender.UserBasedRecommender.mostSimilarUserIDs()

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    assertEquals(0.3f, firstRecommended.getValue(), EPSILON);
  }

  public void testMostSimilar() throws Exception {
    UserBasedRecommender recommender = buildRecommender();
    long[] similar = recommender.mostSimilarUserIDs(1, 2);
    assertNotNull(similar);
    assertEquals(2, similar.length);
    assertEquals(2, similar[0]);
    assertEquals(4, similar[1]);
  }
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                    {null, null, null, null, 1.0},
            });
    UserSimilarity similarity = new PearsonCorrelationSimilarity(dataModel);
    UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, similarity, dataModel);
    UserBasedRecommender recommender = new GenericUserBasedRecommender(dataModel, neighborhood, similarity);
    long[] mostSimilar = recommender.mostSimilarUserIDs(4, 3);
    assertNotNull(mostSimilar);
    assertEquals(0, mostSimilar.length);
  }

  private static UserBasedRecommender buildRecommender() throws TasteException {
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  }

  @Test
  public void testMostSimilar() throws Exception {
    UserBasedRecommender recommender = buildRecommender();
    long[] similar = recommender.mostSimilarUserIDs(1, 2);
    assertNotNull(similar);
    assertEquals(2, similar.length);
    assertEquals(2, similar[0]);
    assertEquals(4, similar[1]);
  }
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                    {null, null, null, null, 1.0},
            });
    UserSimilarity similarity = new PearsonCorrelationSimilarity(dataModel);
    UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, similarity, dataModel);
    UserBasedRecommender recommender = new GenericUserBasedRecommender(dataModel, neighborhood, similarity);
    long[] mostSimilar = recommender.mostSimilarUserIDs(4, 3);
    assertNotNull(mostSimilar);
    assertEquals(0, mostSimilar.length);
  }

  private static UserBasedRecommender buildRecommender() throws TasteException {
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  }

  @Test
  public void testMostSimilar() throws Exception {
    UserBasedRecommender recommender = buildRecommender();
    long[] similar = recommender.mostSimilarUserIDs(1, 2);
    assertNotNull(similar);
    assertEquals(2, similar.length);
    assertEquals(2, similar[0]);
    assertEquals(3, similar[1]);
  }
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                    {null, null, null, null, 1.0},
            });
    UserSimilarity similarity = new PearsonCorrelationSimilarity(dataModel);
    UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, similarity, dataModel);
    UserBasedRecommender recommender = new GenericUserBasedRecommender(dataModel, neighborhood, similarity);
    long[] mostSimilar = recommender.mostSimilarUserIDs(4, 3);
    assertNotNull(mostSimilar);
    assertEquals(0, mostSimilar.length);
  }

  private static UserBasedRecommender buildRecommender() throws TasteException {
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    assertEquals(0.3f, firstRecommended.getValue(), EPSILON);
  }

  public void testMostSimilar() throws Exception {
    UserBasedRecommender recommender = buildRecommender();
    long[] similar = recommender.mostSimilarUserIDs(1, 2);
    assertNotNull(similar);
    assertEquals(2, similar.length);
    assertEquals(2, similar[0]);
    assertEquals(4, similar[1]);
  }
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                    {null, null, null, null, 1.0},
            });
    UserSimilarity similarity = new PearsonCorrelationSimilarity(dataModel);
    UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, similarity, dataModel);
    UserBasedRecommender recommender = new GenericUserBasedRecommender(dataModel, neighborhood, similarity);
    long[] mostSimilar = recommender.mostSimilarUserIDs(4, 3);
    assertNotNull(mostSimilar);
    assertEquals(0, mostSimilar.length);
  }

  private static UserBasedRecommender buildRecommender() throws Exception {
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  }

  @Test
  public void testMostSimilar() throws Exception {
    UserBasedRecommender recommender = buildRecommender();
    long[] similar = recommender.mostSimilarUserIDs(1, 2);
    assertNotNull(similar);
    assertEquals(2, similar.length);
    assertEquals(2, similar[0]);
    assertEquals(3, similar[1]);
  }
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                    {null, null, null, null, 1.0},
            });
    UserSimilarity similarity = new PearsonCorrelationSimilarity(dataModel);
    UserNeighborhood neighborhood = new NearestNUserNeighborhood(3, similarity, dataModel);
    UserBasedRecommender recommender = new GenericUserBasedRecommender(dataModel, neighborhood, similarity);
    long[] mostSimilar = recommender.mostSimilarUserIDs(4, 3);
    assertNotNull(mostSimilar);
    assertEquals(0, mostSimilar.length);
  }

  private static UserBasedRecommender buildRecommender() throws TasteException {
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