/// <summary>
/// Prepares the environment (dataset, predictions, evaluation engine etc) before each test.
/// </summary>
public RecommenderEvaluatorTests()
{
this.dataset = new[]
{
// user, item, predicted rating, prediction distribution, true rating (data domain)
Tuple.Create <string, string, int, RatingDistribution, double>(
"A", "a", 4, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.2 }, { 2, 0.0 }, { 3, 0.0 }, { 4, 0.6 }, { 5, 0.2 }
}, 1.1),
Tuple.Create <string, string, int, RatingDistribution, double>(
"B", "a", 1, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.5 }, { 2, 0.0 }, { 3, 0.0 }, { 4, 0.5 }, { 5, 0.0 }
}, 4.1),
Tuple.Create <string, string, int, RatingDistribution, double>(
"D", "b", 2, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.0 }, { 2, 1.0 }, { 3, 0.0 }, { 4, 0.0 }, { 5, 0.0 }
}, 1.9),
Tuple.Create <string, string, int, RatingDistribution, double>(
"A", "b", 5, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.0 }, { 2, 0.0 }, { 3, 0.0 }, { 4, 0.2 }, { 5, 0.8 }
}, 5.3),
Tuple.Create <string, string, int, RatingDistribution, double>(
"A", "c", 3, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.0 }, { 2, 0.0 }, { 3, 0.6 }, { 4, 0.2 }, { 5, 0.2 }
}, 4.7),
Tuple.Create <string, string, int, RatingDistribution, double>(
"A", "e", 1, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.5 }, { 2, 0.0 }, { 3, 0.0 }, { 4, 0.5 }, { 5, 0.0 }
}, 3.6),
Tuple.Create <string, string, int, RatingDistribution, double>(
"B", "c", 2, new SortedDictionary <int, double> {
{ 0, 0.0 }, { 1, 0.0 }, { 2, 0.8 }, { 3, 0.2 }, { 4, 0.0 }, { 5, 0.0 }
}, 3.1)
};
var recommenderMapping = new StarRatingRecommenderMapping();
var evaluatorMapping = recommenderMapping.ForEvaluation();
this.starRatingInfo = recommenderMapping.GetRatingInfo(null);
this.evaluator = new StarRatingRecommenderEvaluator <IEnumerable <Instance>, string, string, double>(evaluatorMapping);
this.predictions = BuildPredictionDictionary(this.dataset, i => i.Item3);
this.uncertainPredictions = BuildPredictionDictionary(this.dataset, i => i.Item4);
}
/// <summary>
/// Initializes static members of the <see cref="Mappings"/> class.
/// </summary>
static Mappings()
{
StarRatingRecommender = new StarRatingRecommenderMapping();
Classifier = new ClassifierMapping();
}