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 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);
}
/// @param recommender recommender to use
/// @param similarItemsPerItem number of similar items to compute per item
protected BatchItemSimilarities(IItemBasedRecommender recommender, int similarItemsPerItem)
{
this.recommender = recommender;
this.similarItemsPerItem = similarItemsPerItem;
}
/// @param recommender recommender to use
/// @param similarItemsPerItem number of similar items to compute per item
protected BatchItemSimilarities(IItemBasedRecommender recommender, int similarItemsPerItem) {
this.recommender = recommender;
this.similarItemsPerItem = similarItemsPerItem;
}
