public void ReviewersThatHaveReviewedUniqueTitlesShouldNotBeSimilar()
{
var r1 = ReviewerBuilder.BuildReviewer1();
var r2 = ReviewerBuilder.BuildAReviewerThatReviewedSomethingUnique();
euclideanDistance = new EuclideanDistance(r1, r2);
Assert.AreEqual(0, euclideanDistance.Score());
}
public List<string> Calculate()
{
var scores = new Dictionary<string, double>();
var count = new Dictionary<string, double>();
foreach (var r in Reviewers)
{
var similarityScore = new EuclideanDistance(CurrentUser, r).Score();
if (similarityScore <= 0)
{
continue;
}
var oppositeItems = new FindOppositeReviews(CurrentUser.Reviews, r.Reviews).Calculate();
foreach (var item in oppositeItems)
{
var weightedScore = r.Reviews[item] * similarityScore;
if (scores.ContainsKey(item))
{
count[item]++;
scores[item] += weightedScore;
}
else
{
scores.Add(item, weightedScore);
count.Add(item, 1);
}
}
}
var sortedRecommendations = CalculateSortedRecommendations(scores, count);
return sortedRecommendations.Keys.ToList();
}
private static void RunEuclideanDistanceWithLowScore()
{
var r1 = ReviewerBuilder.BuildReviewer1();
var r2 = ReviewerBuilder.BuildReviewer2();
var euclideanDistance = new EuclideanDistance(r1, r2);
Console.WriteLine("The Euclidean Distance between {0} and {1} is: {2}", r1.Name, r2.Name, euclideanDistance.Score());
}
public void TwoReviewersWithSomeSimilarReviewsShouldHaveAPositiveScoreRegardlessOfOrder()
{
euclideanDistance = new EuclideanDistance(ReviewerBuilder.BuildReviewer7(), ReviewerBuilder.BuildReviewer6());
Assert.AreEqual(0.148, euclideanDistance.Score());
}
public void ShouldReturnASimilarityScoreOfZeroWhenBothUsersHaveNoSimilarReviews()
{
var r = ReviewerBuilder.BuildReviewerWithNoReviews();
euclideanDistance = new EuclideanDistance(r, r);
Assert.AreEqual(0.0, euclideanDistance.Score());
}
public void SetUp()
{
euclideanDistance = new EuclideanDistance(ReviewerBuilder.BuildReviewer1(), ReviewerBuilder.BuildReviewer2());
}
public void ReviewersWithIdenticalReviewsShouldHaveASimilarityScoreOfOne()
{
var r = ReviewerBuilder.BuildReviewer1();
euclideanDistance = new EuclideanDistance(r, r);
Assert.AreEqual(1.0, euclideanDistance.Score());
}
public void ReviewersThatHaveTheSameTasteShouldHaveAPerfectScore()
{
var r1 = ReviewerBuilder.BuildReviewer1();
euclideanDistance = new EuclideanDistance(r1, r1);
Assert.AreEqual(1.0, euclideanDistance.Score());
}
