コード例 #1
0
 /**
  * Check that we score items but do not provide scores for items the user has previously rated.
  * User 5 has rated only item 8 previously.
  */
 @Test
 public void testItemScorerNoRating() {
   long[] items = {7, 8};
   ItemItemScorer scorer = session.get(ItemItemScorer.class);
   assertThat(scorer, notNullValue());
   SparseVector scores = scorer.score(5, LongArrayList.wrap(items));
   assertThat(scores, notNullValue());
   assertThat(scores.size(), equalTo(1));
   assertThat(scores.get(7), not(notANumber()));
   assertThat(scores.containsKey(8), equalTo(false));
 }
コード例 #2
0
  /**
   * Check that we score items but do not provide scores for items the user has previously rated.
   * User 5 has rated only item 8 previously.
   */
  @Test
  public void testItemScorerChannels() {
    long[] items = {7, 8};
    ItemItemScorer scorer = session.get(ItemItemScorer.class);
    assertThat(scorer, notNullValue());
    SparseVector scores = scorer.score(5, LongArrayList.wrap(items));
    assertThat(scores, notNullValue());
    assertThat(scores.size(), equalTo(1));
    assertThat(scores.get(7), not(notANumber()));
    assertThat(
        scores.getChannelVector(ItemItemScorer.NEIGHBORHOOD_SIZE_SYMBOL).get(7),
        closeTo(1.0, 1.0e-5));
    assertThat(scores.containsKey(8), equalTo(false));

    long[] items2 = {7, 8, 9};
    scorer = session.get(ItemItemScorer.class);
    assertThat(scorer, notNullValue());
    scores = scorer.score(2, LongArrayList.wrap(items2));
    assertThat(
        scores.getChannelVector(ItemItemScorer.NEIGHBORHOOD_SIZE_SYMBOL).get(9),
        closeTo(3.0, 1.0e-5)); // 1, 7, 8
  }