public void testUserRescorer()
{
IDRescorer rescorer = NullRescorer.getUserInstance();
Assert.NotNull(rescorer);
Assert.AreEqual(1.0, rescorer.rescore(1L, 1.0), EPSILON);
Assert.AreEqual(1.0, rescorer.rescore(0L, 1.0), EPSILON);
Assert.AreEqual(0.0, rescorer.rescore(1L, 0.0), EPSILON);
Assert.True(Double.IsNaN(rescorer.rescore(1L, Double.NaN)));
}
public void testRecommender()
{
var mockRecommender = new MockRecommender(0);
IRecommender cachingRecommender = new CachingRecommender(mockRecommender);
cachingRecommender.Recommend(1, 1);
Assert.AreEqual(1, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1);
Assert.AreEqual(2, mockRecommender.recommendCount);
cachingRecommender.Recommend(1, 1);
Assert.AreEqual(2, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1);
Assert.AreEqual(2, mockRecommender.recommendCount);
cachingRecommender.Refresh(null);
cachingRecommender.Recommend(1, 1);
Assert.AreEqual(3, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1);
Assert.AreEqual(4, mockRecommender.recommendCount);
cachingRecommender.Recommend(3, 1);
Assert.AreEqual(5, mockRecommender.recommendCount);
// Results from this recommend() method can be cached...
IDRescorer rescorer = NullRescorer.getItemInstance();
cachingRecommender.Refresh(null);
cachingRecommender.Recommend(1, 1, rescorer);
Assert.AreEqual(6, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1, rescorer);
Assert.AreEqual(7, mockRecommender.recommendCount);
cachingRecommender.Recommend(1, 1, rescorer);
Assert.AreEqual(7, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1, rescorer);
Assert.AreEqual(7, mockRecommender.recommendCount);
// until you switch Rescorers
cachingRecommender.Recommend(1, 1, null);
Assert.AreEqual(8, mockRecommender.recommendCount);
cachingRecommender.Recommend(2, 1, null);
Assert.AreEqual(9, mockRecommender.recommendCount);
cachingRecommender.Refresh(null);
cachingRecommender.EstimatePreference(1, 1);
Assert.AreEqual(10, mockRecommender.recommendCount);
cachingRecommender.EstimatePreference(1, 2);
Assert.AreEqual(11, mockRecommender.recommendCount);
cachingRecommender.EstimatePreference(1, 2);
Assert.AreEqual(11, mockRecommender.recommendCount);
}