Examples of org.apache.mahout.cf.taste.recommender.ItemBasedRecommender.mostSimilarItems()

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

Class org.apache.mahout.cf.taste.recommender.ItemBasedRecommender

Examples of org.apache.mahout.cf.taste.recommender.ItemBasedRecommender.mostSimilarItems()

org.apache.mahout.cf.taste.recommender.ItemBasedRecommender.mostSimilarItems()
@param itemID ID of item for which to find most similar other items @param howMany desired number of most similar items to find @return items most similar to the given item, ordered from most similar to least @throws TasteException if an error occurs while accessing the {@link org.apache.mahout.cf.taste.model.DataModel}

  }


  @Test
  public void testMostSimilarToMultipleExcludeIfNotSimilarToAll() throws Exception {
    ItemBasedRecommender recommender = buildRecommender2();
    List<RecommendedItem> similar = recommender.mostSimilarItems(new long[] {3, 4}, 2);
    assertNotNull(similar);
    assertEquals(1, similar.size());
    RecommendedItem first = similar.get(0);
    assertEquals(0, first.getItemID());
    assertEquals(0.2f, first.getValue(), EPSILON);

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  }


  @Test
  public void testMostSimilarToMultipleDontExcludeIfNotSimilarToAll() throws Exception {
    ItemBasedRecommender recommender = buildRecommender2();
    List<RecommendedItem> similar = recommender.mostSimilarItems(new long[] {1, 2, 4}, 10, false);
    assertNotNull(similar);
    assertEquals(2, similar.size());
    RecommendedItem first = similar.get(0);
    RecommendedItem second = similar.get(1);
    assertEquals(0, first.getItemID());

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