public void testRecommender()
{
IRecommender recommender = buildRecommender();
IList <IRecommendedItem> recommended = recommender.Recommend(1, 1);
Assert.NotNull(recommended);
Assert.AreEqual(1, recommended.Count);
IRecommendedItem firstRecommended = recommended[0];
Assert.AreEqual(2, firstRecommended.GetItemID());
Assert.AreEqual(0.1f, firstRecommended.GetValue(), EPSILON);
recommender.Refresh(null);
Assert.AreEqual(2, firstRecommended.GetItemID());
Assert.AreEqual(0.1f, firstRecommended.GetValue(), EPSILON);
}
public void testRecommender()
{
IRecommender recommender = new ItemAverageRecommender(getDataModel());
IList <IRecommendedItem> recommended = recommender.Recommend(1, 1);
Assert.NotNull(recommended);
Assert.AreEqual(1, recommended.Count);
IRecommendedItem firstRecommended = recommended[0];
Assert.AreEqual(2, firstRecommended.GetItemID());
Assert.AreEqual(0.53333336f, firstRecommended.GetValue(), EPSILON);
recommender.Refresh(null);
Assert.AreEqual(2, firstRecommended.GetItemID());
Assert.AreEqual(0.53333336f, firstRecommended.GetValue(), EPSILON);
}
public override bool Equals(object o)
{
if (!(o is GenericRecommendedItem))
{
return(false);
}
IRecommendedItem other = (IRecommendedItem)o;
return(itemID == other.GetItemID() && value == other.GetValue());
}
public void testMostSimilarToMultipleExcludeIfNotSimilarToAll()
{
IItemBasedRecommender recommender = buildRecommender2();
List <IRecommendedItem> similar = recommender.MostSimilarItems(new long[] { 3, 4 }, 2);
Assert.NotNull(similar);
Assert.AreEqual(1, similar.Count);
IRecommendedItem first = similar[0];
Assert.AreEqual(0, first.GetItemID());
Assert.AreEqual(0.2f, first.GetValue(), EPSILON);
}
public void testBestRating()
{
IRecommender recommender = buildRecommender();
IList <IRecommendedItem> recommended = recommender.Recommend(1, 1);
Assert.NotNull(recommended);
Assert.AreEqual(1, recommended.Count);
IRecommendedItem firstRecommended = recommended[0];
// item one should be recommended because it has a greater rating/score
Assert.AreEqual(2, firstRecommended.GetItemID());
Assert.AreEqual(0.1f, firstRecommended.GetValue(), EPSILON);
}
public void testMostSimilarToMultipleDontExcludeIfNotSimilarToAll()
{
IItemBasedRecommender recommender = buildRecommender2();
List <IRecommendedItem> similar = recommender.MostSimilarItems(new long[] { 1, 2, 4 }, 10, false);
Assert.NotNull(similar);
Assert.AreEqual(2, similar.Count);
IRecommendedItem first = similar[0];
IRecommendedItem second = similar[1];
Assert.AreEqual(0, first.GetItemID());
Assert.AreEqual(0.933333333f, first.GetValue(), EPSILON);
Assert.AreEqual(3, second.GetItemID());
Assert.AreEqual(-0.2f, second.GetValue(), EPSILON);
}
public void testMostSimilarToMultiple()
{
IItemBasedRecommender recommender = buildRecommender2();
List <IRecommendedItem> similar = recommender.MostSimilarItems(new long[] { 0, 1 }, 2);
Assert.NotNull(similar);
Assert.AreEqual(2, similar.Count);
IRecommendedItem first = similar[0];
IRecommendedItem second = similar[1];
Assert.AreEqual(2, first.GetItemID());
Assert.AreEqual(0.85f, first.GetValue(), EPSILON);
Assert.AreEqual(3, second.GetItemID());
Assert.AreEqual(-0.3f, second.GetValue(), EPSILON);
}
public void testMostSimilar()
{
IItemBasedRecommender recommender = buildRecommender();
List <IRecommendedItem> similar = recommender.MostSimilarItems(0, 2);
Assert.NotNull(similar);
Assert.AreEqual(2, similar.Count);
IRecommendedItem first = similar[0];
IRecommendedItem second = similar[1];
Assert.AreEqual(1, first.GetItemID());
Assert.AreEqual(1.0f, first.GetValue(), EPSILON);
Assert.AreEqual(2, second.GetItemID());
Assert.AreEqual(0.5f, second.GetValue(), EPSILON);
}
public void testRecommendedBecause()
{
IItemBasedRecommender recommender = buildRecommender2();
List <IRecommendedItem> recommendedBecause = recommender.RecommendedBecause(1, 4, 3);
Assert.NotNull(recommendedBecause);
Assert.AreEqual(3, recommendedBecause.Count);
IRecommendedItem first = recommendedBecause[0];
IRecommendedItem second = recommendedBecause[1];
IRecommendedItem third = recommendedBecause[2];
Assert.AreEqual(2, first.GetItemID());
Assert.AreEqual(0.99f, first.GetValue(), EPSILON);
Assert.AreEqual(3, second.GetItemID());
Assert.AreEqual(0.4f, second.GetValue(), EPSILON);
Assert.AreEqual(0, third.GetItemID());
Assert.AreEqual(0.2f, third.GetValue(), EPSILON);
}