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

Examples of org.apache.mahout.cf.taste.recommender.IDRescorer.rescore()

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  @Test
  public void testItemRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getItemInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

  @Test
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  public void testItemRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getItemInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

  @Test
  public void testUserRescorer() throws Exception {
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    IDRescorer rescorer = NullRescorer.getItemInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

  @Test
  public void testUserRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getUserInstance();
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  @Test
  public void testUserRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getUserInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }
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  @Test
  public void testUserRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getUserInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

}
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  public void testUserRescorer() throws Exception {
    IDRescorer rescorer = NullRescorer.getUserInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

}
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    IDRescorer rescorer = NullRescorer.getUserInstance();
    assertNotNull(rescorer);
    assertEquals(1.0, rescorer.rescore(1L, 1.0), EPSILON);
    assertEquals(1.0, rescorer.rescore(0L, 1.0), EPSILON);
    assertEquals(0.0, rescorer.rescore(1L, 0.0), EPSILON);
    assertTrue(Double.isNaN(rescorer.rescore(1L, Double.NaN)));
  }

}
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      sum += SimpleVectorMath.dot(itemFeatures, oneUserFeatures);
      count++;
    }
   
    if (rescorer != null) {
      sum = rescorer.rescore(itemID, sum);
      if (!LangUtils.isFinite(sum)) {
        return null;
      }
    }
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    IDRescorer theRescorer = rescorer;
    if (theRescorer != null) {
      if (theRescorer.isFiltered(id)) {
        return null;
      }
      value = (float) theRescorer.rescore(id, value);
      if (!LangUtils.isFinite(value)) {
        return null;
      }
    }
    delegate.set(id, value);
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                  userTags.put(itemIDString, new GenericRecommendedItem(userID, value));
                } else {
                  if (provider != null) {
                    IDRescorer rescorer = provider.getRecommendRescorer(new long[] {userID}, null);
                    if (rescorer != null) {
                      value = (float) rescorer.rescore(itemID, value);
                    }
                  }
                  data.put(userID, new GenericRecommendedItem(itemID, value));
                }
              }
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