public PersonalizeViewModel()
{
RecommendedItems = new RecommendedItems();
MoviesRatedByUser = new MoviesRatedByUser();
MostPopularItems = new MostPopularItems();
PersonalizedRankingResults = new PersonalizedRankingResults();
SimilarItems = new SimilarItems();
PersonalizedRankingResultsForRecommendations = new PersonalizedRankingResults();
}
public List <RecommendedItems> RecommendNotPurchased(IList <SequenceSupport> sequenceSupports2Items, IList <UserSequence> userSequences, int recommendationNumber)
{
/*************************************************************************************/
// Fill User Item Matrix based on support of each rule
/*************************************************************************************/
List <string> preRule = sequenceSupports2Items.SelectMany(a => a.sequence[0]).ToList();
List <UserItemRating> userItemRatingMatrix = new List <UserItemRating>();
foreach (UserSequence userSequence in userSequences)
{
List <string> userPurchasedItems = userSequence.Sequence.SelectMany(a => a).Distinct().ToList();
foreach (string item in userPurchasedItems)
{
if (preRule.Contains(item))
{
IList <SequenceSupport> sequenceSupports = sequenceSupports2Items
.Where(a => string.Equals(a.sequence[0][0], item)).ToList();
foreach (SequenceSupport sequenceSupport in sequenceSupports)
{
string descendantRule = sequenceSupport.sequence[1][0];
//select rules which user has not purchased the rule's descendant
if (!userPurchasedItems.Contains(descendantRule))
{
if (userItemRatingMatrix.Any(a =>
a.UserId == userSequence.User &&
a.ItemId == string.Copy(sequenceSupport.sequence[1][0])))
{
userItemRatingMatrix.FirstOrDefault(a =>
a.UserId == userSequence.User &&
a.ItemId == string.Copy(sequenceSupport.sequence[1][0])).Rating +=
sequenceSupport.support;
}
else
{
UserItemRating userItemRating = new UserItemRating();
userItemRating.UserId = userSequence.User;
userItemRating.ItemId = string.Copy(sequenceSupport.sequence[1][0]);
userItemRating.Rating = sequenceSupport.support;
userItemRatingMatrix.Add(userItemRating);
}
}
}
}
}
}
System.Diagnostics.Debug.WriteLine("Step 1: " + DateTime.Now.TimeOfDay + " - UserItemMatrix created");
/*************************************************************************************/
// Normalized UserItemRatingMatrix with unit vector method
/*************************************************************************************/
IEnumerable <int> users = userItemRatingMatrix.Select(a => a.UserId).Distinct();
List <UserItemRating> userItemRatingMatrixNormalized = new List <UserItemRating>();
List <UserVector> userVectors = new List <UserVector>();
//Find average rating of each user
foreach (int user1 in users)
{
UserVector userVector = new UserVector()
{
};
userVector.User = user1;
IEnumerable <float> ratings = userItemRatingMatrix.Where(a => a.UserId == user1).Select(a => a.Rating);
float ratingsPower2 = 0;
foreach (float rating in ratings)
{
ratingsPower2 += (float)Math.Pow(rating, 2.0);
}
userVector.Vector = (float)Math.Sqrt(ratingsPower2);
userVectors.Add(userVector);
}
//fillup adjusted UserItem matrix
foreach (UserItemRating userItemRating in userItemRatingMatrix)
{
float NormalziedRating = userItemRating.Rating / userVectors.Where(a => a.User == userItemRating.UserId).First().Vector;
UserItemRating userItemRatingAdjusted = new UserItemRating(userItemRating.UserId, userItemRating.ItemId, NormalziedRating);
userItemRatingMatrixNormalized.Add(userItemRatingAdjusted);
}
System.Diagnostics.Debug.WriteLine("Step 2: " + DateTime.Now.TimeOfDay + " - UserItemMatrix normalized");
/*************************************************************************************/
// Step 5: Recommend products
/*************************************************************************************/
List <RecommendedItems> recomendations = new List <RecommendedItems>()
{
};
foreach (int user in users)
{
RecommendedItems recomendation = new RecommendedItems()
{
};
recomendation.User = user;
recomendation.Items = new List <ItemRating>();
IEnumerable <UserItemRating> userItemRatings = userItemRatingMatrixNormalized.Where(a => a.UserId == user).OrderByDescending(a => a.Rating);
for (int i = 0; i < recommendationNumber; i++)
{
UserItemRating userItemRating = userItemRatings.Skip(i).FirstOrDefault();
if (userItemRating != null)
{
ItemRating itemRating = new ItemRating(userItemRating.ItemId, userItemRating.Rating);
recomendation.Items.Add(itemRating);
}
else
{
break;
}
}
recomendations.Add(recomendation);
}
Console.WriteLine("Step 3: " + DateTime.Now.TimeOfDay + " - Recommend products");
return(recomendations);
}
//[ValidateAntiForgeryToken]
public IActionResult Recommendations(int recommendationNumber, int cfWeight, int spmWeight)
{
int recInfoid = _dbContext.RecommendationInfo.First(a => string.Equals(a.RecName, "Spm11Month")).RecId;
IList <Recommendation> recommendationsSpm = _dbContext.Recommendation
.Where(a => a.RecommendationInfoId == recInfoid).ToList();
recInfoid = _dbContext.RecommendationInfo.First(a => string.Equals(a.RecName, "Cf11Month")).RecId;
IList <Recommendation> recommendationsCf = _dbContext.Recommendation
.Where(a => a.RecommendationInfoId == recInfoid).ToList();
/*************************************************************************************/
// Fill User Item Matrix based on support of each rule
/*************************************************************************************/
IList <RecommendedItems> RecommendeditemsCf = new List <RecommendedItems>();
foreach (var a in recommendationsCf)
{
RecommendedItems recommendedItems = new RecommendedItems();
recommendedItems.User = a.UserId;
recommendedItems.Items = new List <ItemRating>();
if (a.Item1 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item1, (float)a.Rating1.GetValueOrDefault()));
}
if (a.Item2 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item2, (float)a.Rating2.GetValueOrDefault()));
}
if (a.Item3 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item3, (float)a.Rating3.GetValueOrDefault()));
}
if (a.Item4 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item4, (float)a.Rating4.GetValueOrDefault()));
}
if (a.Item5 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item5, (float)a.Rating5.GetValueOrDefault()));
}
if (a.Item6 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item6, (float)a.Rating6.GetValueOrDefault()));
}
if (a.Item7 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item7, (float)a.Rating7.GetValueOrDefault()));
}
if (a.Item8 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item8, (float)a.Rating8.GetValueOrDefault()));
}
if (a.Item9 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item9, (float)a.Rating9.GetValueOrDefault()));
}
if (a.Item10 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item10, (float)a.Rating10.GetValueOrDefault()));
}
if (a.Item11 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item11, (float)a.Rating11.GetValueOrDefault()));
}
if (a.Item12 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item12, (float)a.Rating12.GetValueOrDefault()));
}
if (a.Item13 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item13, (float)a.Rating13.GetValueOrDefault()));
}
if (a.Item14 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item14, (float)a.Rating14.GetValueOrDefault()));
}
if (a.Item15 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item15, (float)a.Rating15.GetValueOrDefault()));
}
if (a.Item16 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item16, (float)a.Rating16.GetValueOrDefault()));
}
if (a.Item17 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item17, (float)a.Rating17.GetValueOrDefault()));
}
if (a.Item18 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item18, (float)a.Rating18.GetValueOrDefault()));
}
if (a.Item19 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item19, (float)a.Rating19.GetValueOrDefault()));
}
if (a.Item20 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item20, (float)a.Rating20.GetValueOrDefault()));
}
if (a.Item21 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item21, (float)a.Rating21.GetValueOrDefault()));
}
if (a.Item22 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item22, (float)a.Rating22.GetValueOrDefault()));
}
if (a.Item23 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item23, (float)a.Rating23.GetValueOrDefault()));
}
if (a.Item24 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item24, (float)a.Rating24.GetValueOrDefault()));
}
if (a.Item25 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item25, (float)a.Rating25.GetValueOrDefault()));
}
if (a.Item26 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item26, (float)a.Rating26.GetValueOrDefault()));
}
if (a.Item27 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item27, (float)a.Rating27.GetValueOrDefault()));
}
if (a.Item28 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item28, (float)a.Rating28.GetValueOrDefault()));
}
if (a.Item29 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item29, (float)a.Rating29.GetValueOrDefault()));
}
if (a.Item30 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item30, (float)a.Rating30.GetValueOrDefault()));
}
if (a.Item31 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item31, (float)a.Rating31.GetValueOrDefault()));
}
if (a.Item32 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item32, (float)a.Rating32.GetValueOrDefault()));
}
if (a.Item33 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item33, (float)a.Rating33.GetValueOrDefault()));
}
if (a.Item34 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item34, (float)a.Rating34.GetValueOrDefault()));
}
if (a.Item35 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item35, (float)a.Rating35.GetValueOrDefault()));
}
if (a.Item36 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item36, (float)a.Rating36.GetValueOrDefault()));
}
if (a.Item37 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item37, (float)a.Rating37.GetValueOrDefault()));
}
if (a.Item38 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item38, (float)a.Rating38.GetValueOrDefault()));
}
if (a.Item39 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item39, (float)a.Rating39.GetValueOrDefault()));
}
if (a.Item40 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item40, (float)a.Rating40.GetValueOrDefault()));
}
if (a.Item41 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item41, (float)a.Rating41.GetValueOrDefault()));
}
if (a.Item42 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item42, (float)a.Rating42.GetValueOrDefault()));
}
if (a.Item43 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item43, (float)a.Rating43.GetValueOrDefault()));
}
if (a.Item44 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item44, (float)a.Rating44.GetValueOrDefault()));
}
if (a.Item45 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item45, (float)a.Rating45.GetValueOrDefault()));
}
if (a.Item46 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item46, (float)a.Rating46.GetValueOrDefault()));
}
if (a.Item47 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item47, (float)a.Rating47.GetValueOrDefault()));
}
if (a.Item48 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item48, (float)a.Rating48.GetValueOrDefault()));
}
if (a.Item49 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item49, (float)a.Rating49.GetValueOrDefault()));
}
if (a.Item50 != null)
{
recommendedItems.Items.Add(new ItemRating(a.Item50, (float)a.Rating50.GetValueOrDefault()));
}
RecommendeditemsCf.Add(recommendedItems);
}
IList <RecommendedItems> recommendedItemsSpm = new List <RecommendedItems>();
foreach (var a in recommendationsSpm)
{
RecommendedItems recommendedItems = new RecommendedItems();
recommendedItems.User = a.UserId;
recommendedItems.Items = new List <ItemRating>();
if (a.Item1 != null && a.Item1 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item1, (float)a.Rating1.GetValueOrDefault()));
}
if (a.Item2 != null && a.Item2 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item2, (float)a.Rating2.GetValueOrDefault()));
}
if (a.Item3 != null && a.Item3 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item3, (float)a.Rating3.GetValueOrDefault()));
}
if (a.Item4 != null && a.Item4 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item4, (float)a.Rating4.GetValueOrDefault()));
}
if (a.Item5 != null && a.Item5 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item5, (float)a.Rating5.GetValueOrDefault()));
}
if (a.Item6 != null && a.Item6 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item6, (float)a.Rating6.GetValueOrDefault()));
}
if (a.Item7 != null && a.Item7 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item7, (float)a.Rating7.GetValueOrDefault()));
}
if (a.Item8 != null && a.Item8 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item8, (float)a.Rating8.GetValueOrDefault()));
}
if (a.Item9 != null && a.Item9 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item9, (float)a.Rating9.GetValueOrDefault()));
}
if (a.Item10 != null && a.Item10 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item10, (float)a.Rating10.GetValueOrDefault()));
}
if (a.Item11 != null && a.Item11 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item11, (float)a.Rating11.GetValueOrDefault()));
}
if (a.Item12 != null && a.Item12 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item12, (float)a.Rating12.GetValueOrDefault()));
}
if (a.Item13 != null && a.Item13 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item13, (float)a.Rating13.GetValueOrDefault()));
}
if (a.Item14 != null && a.Item14 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item14, (float)a.Rating14.GetValueOrDefault()));
}
if (a.Item15 != null && a.Item15 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item15, (float)a.Rating15.GetValueOrDefault()));
}
if (a.Item16 != null && a.Item16 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item16, (float)a.Rating16.GetValueOrDefault()));
}
if (a.Item17 != null && a.Item17 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item17, (float)a.Rating17.GetValueOrDefault()));
}
if (a.Item18 != null && a.Item18 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item18, (float)a.Rating18.GetValueOrDefault()));
}
if (a.Item19 != null && a.Item19 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item19, (float)a.Rating19.GetValueOrDefault()));
}
if (a.Item20 != null && a.Item20 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item20, (float)a.Rating20.GetValueOrDefault()));
}
if (a.Item21 != null && a.Item21 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item21, (float)a.Rating21.GetValueOrDefault()));
}
if (a.Item22 != null && a.Item22 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item22, (float)a.Rating22.GetValueOrDefault()));
}
if (a.Item23 != null && a.Item23 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item23, (float)a.Rating23.GetValueOrDefault()));
}
if (a.Item24 != null && a.Item24 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item24, (float)a.Rating24.GetValueOrDefault()));
}
if (a.Item25 != null && a.Item25 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item25, (float)a.Rating25.GetValueOrDefault()));
}
if (a.Item26 != null && a.Item26 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item26, (float)a.Rating26.GetValueOrDefault()));
}
if (a.Item27 != null && a.Item27 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item27, (float)a.Rating27.GetValueOrDefault()));
}
if (a.Item28 != null && a.Item28 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item28, (float)a.Rating28.GetValueOrDefault()));
}
if (a.Item29 != null && a.Item29 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item29, (float)a.Rating29.GetValueOrDefault()));
}
if (a.Item30 != null && a.Item30 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item30, (float)a.Rating30.GetValueOrDefault()));
}
if (a.Item31 != null && a.Item31 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item31, (float)a.Rating31.GetValueOrDefault()));
}
if (a.Item32 != null && a.Item32 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item32, (float)a.Rating32.GetValueOrDefault()));
}
if (a.Item33 != null && a.Item33 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item33, (float)a.Rating33.GetValueOrDefault()));
}
if (a.Item34 != null && a.Item34 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item34, (float)a.Rating34.GetValueOrDefault()));
}
if (a.Item35 != null && a.Item35 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item35, (float)a.Rating35.GetValueOrDefault()));
}
if (a.Item36 != null && a.Item36 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item36, (float)a.Rating36.GetValueOrDefault()));
}
if (a.Item37 != null && a.Item37 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item37, (float)a.Rating37.GetValueOrDefault()));
}
if (a.Item38 != null && a.Item38 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item38, (float)a.Rating38.GetValueOrDefault()));
}
if (a.Item39 != null && a.Item39 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item39, (float)a.Rating39.GetValueOrDefault()));
}
if (a.Item40 != null && a.Item40 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item40, (float)a.Rating40.GetValueOrDefault()));
}
if (a.Item41 != null && a.Item41 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item41, (float)a.Rating41.GetValueOrDefault()));
}
if (a.Item42 != null && a.Item42 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item42, (float)a.Rating42.GetValueOrDefault()));
}
if (a.Item43 != null && a.Item43 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item43, (float)a.Rating43.GetValueOrDefault()));
}
if (a.Item44 != null && a.Item44 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item44, (float)a.Rating44.GetValueOrDefault()));
}
if (a.Item45 != null && a.Item45 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item45, (float)a.Rating45.GetValueOrDefault()));
}
if (a.Item46 != null && a.Item46 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item46, (float)a.Rating46.GetValueOrDefault()));
}
if (a.Item47 != null && a.Item47 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item47, (float)a.Rating47.GetValueOrDefault()));
}
if (a.Item48 != null && a.Item48 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item48, (float)a.Rating48.GetValueOrDefault()));
}
if (a.Item49 != null && a.Item49 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item49, (float)a.Rating49.GetValueOrDefault()));
}
if (a.Item50 != null && a.Item50 != string.Empty)
{
recommendedItems.Items.Add(new ItemRating(a.Item50, (float)a.Rating50.GetValueOrDefault()));
}
recommendedItemsSpm.Add(recommendedItems);
}
EnsembleRecommendationService ensembleRecommendation = new EnsembleRecommendationService();
List <RecommendedItems> recommendedItemsList = ensembleRecommendation.RecommendOptimizedHope(
RecommendeditemsCf,
recommendedItemsSpm,
(float)cfWeight / 100,
(float)spmWeight / 100,
recommendationNumber);
SavetoDatabase(recommendedItemsList);
return(View(recommendedItemsList));
}
