[Test()] public void TestComputeCorrelations()
{
// create test objects
var pearson = new Pearson(3, 0f);
var rating_data = new Ratings();
rating_data.Add(0, 1, 0.3f);
rating_data.Add(0, 2, 0.6f);
rating_data.Add(0, 4, 0.2f);
rating_data.Add(1, 3, 0.4f);
rating_data.Add(1, 4, 0.2f);
rating_data.Add(2, 0, 0.1f);
rating_data.Add(2, 1, 0.3f);
// test
pearson.Shrinkage = 0;
pearson.ComputeCorrelations(rating_data, EntityType.USER);
Assert.AreEqual(0, pearson[0, 2]);
}
[Test()] public void TestCreate()
{
var ratings = new Ratings();
ratings.Add(0, 1, 0.3f);
ratings.Add(0, 2, 0.6f);
ratings.Add(0, 4, 0.2f);
ratings.Add(1, 3, 0.4f);
ratings.Add(1, 4, 0.2f);
ratings.Add(2, 0, 0.1f);
ratings.Add(2, 1, 0.3f);
var correlation_matrix = new Pearson(ratings.MaxUserID + 1, 0f);
correlation_matrix.ComputeCorrelations(ratings, EntityType.USER);
Assert.AreEqual(3, correlation_matrix.NumberOfRows);
Assert.IsTrue(correlation_matrix.IsSymmetric);
Assert.AreEqual(0, correlation_matrix[0, 1]);
}
