/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string datasetFile = string.Empty;
string trainedModelFile = string.Empty;
string predictionsFile = string.Empty;
int maxRelatedUserCount = 5;
int minCommonRatingCount = 5;
int minRelatedUserPoolSize = 5;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--data", "FILE", "Dataset to make predictions for", v => datasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--model", "FILE", "File with trained model", v => trainedModelFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--predictions", "FILE", "File with generated predictions", v => predictionsFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--max-users", "NUM", "Maximum number of related users for a single user; defaults to 5", v => maxRelatedUserCount = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--min-common-items", "NUM", "Minimum number of items that the query user and the related user should have rated in common; defaults to 5", v => minCommonRatingCount = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--min-pool-size", "NUM", "Minimum size of the related user pool for a single user; defaults to 5", v => minRelatedUserPoolSize = v, CommandLineParameterType.Optional);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
RecommenderDataset testDataset = RecommenderDataset.Load(datasetFile);
var trainedModel = MatchboxRecommender.Load <RecommenderDataset, User, Item, DummyFeatureSource>(trainedModelFile);
var evaluator = new RecommenderEvaluator <RecommenderDataset, User, Item, int, int, Discrete>(
Mappings.StarRatingRecommender.ForEvaluation());
IDictionary <User, IEnumerable <User> > relatedUsers = evaluator.FindRelatedUsersWhoRatedSameItems(
trainedModel, testDataset, maxRelatedUserCount, minCommonRatingCount, minRelatedUserPoolSize);
RecommenderPersistenceUtils.SaveRelatedUsers(predictionsFile, relatedUsers);
return(true);
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string testDatasetFile = string.Empty;
string predictionsFile = string.Empty;
string reportFile = string.Empty;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--test-data", "FILE", "Test dataset used to obtain ground truth", v => testDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--predictions", "FILE", "Predictions to evaluate", v => predictionsFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--report", "FILE", "Evaluation report file", v => reportFile = v, CommandLineParameterType.Required);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
RecommenderDataset testDataset = RecommenderDataset.Load(testDatasetFile);
IDictionary <User, IDictionary <Item, int> > ratingPredictions = RecommenderPersistenceUtils.LoadPredictedRatings(predictionsFile);
var evaluatorMapping = Mappings.StarRatingRecommender.ForEvaluation();
var evaluator = new StarRatingRecommenderEvaluator <RecommenderDataset, User, Item, int>(evaluatorMapping);
using (var writer = new StreamWriter(reportFile))
{
writer.WriteLine(
"Mean absolute error: {0:0.000}",
evaluator.RatingPredictionMetric(testDataset, ratingPredictions, Metrics.AbsoluteError));
writer.WriteLine(
"Root mean squared error: {0:0.000}",
Math.Sqrt(evaluator.RatingPredictionMetric(testDataset, ratingPredictions, Metrics.SquaredError)));
}
return(true);
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string inputDatasetFile = string.Empty;
string outputDatasetFile = string.Empty;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--input-data", "FILE", "Input dataset, treated as if all the ratings are positive", v => inputDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--output-data", "FILE", "Output dataset with both posisitve and negative data", v => outputDatasetFile = v, CommandLineParameterType.Required);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
var generatorMapping = Mappings.StarRatingRecommender.WithGeneratedNegativeData();
var inputDataset = RecommenderDataset.Load(inputDatasetFile);
var outputDataset = new RecommenderDataset(
generatorMapping.GetInstances(inputDataset).Select(i => new RatedUserItem(i.User, i.Item, i.Rating)),
generatorMapping.GetRatingInfo(inputDataset));
outputDataset.Save(outputDatasetFile);
return(true);
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string inputDatasetFile = string.Empty;
string outputTrainingDatasetFile = string.Empty;
string outputTestDatasetFile = string.Empty;
double trainingOnlyUserFraction = 0.5;
double testUserRatingTrainingFraction = 0.25;
double coldUserFraction = 0;
double coldItemFraction = 0;
double ignoredUserFraction = 0;
double ignoredItemFraction = 0;
bool removeOccasionalColdItems = false;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--input-data", "FILE", "Dataset to split", v => inputDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--output-data-train", "FILE", "Training part of the split dataset", v => outputTrainingDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--output-data-test", "FILE", "Test part of the split dataset", v => outputTestDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--training-users", "NUM", "Fraction of training-only users; defaults to 0.5", (double v) => trainingOnlyUserFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--test-user-training-ratings", "NUM", "Fraction of test user ratings for training; defaults to 0.25", (double v) => testUserRatingTrainingFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--cold-users", "NUM", "Fraction of cold (test-only) users; defaults to 0", (double v) => coldUserFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--cold-items", "NUM", "Fraction of cold (test-only) items; defaults to 0", (double v) => coldItemFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--ignored-users", "NUM", "Fraction of ignored users; defaults to 0", (double v) => ignoredUserFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--ignored-items", "NUM", "Fraction of ignored items; defaults to 0", (double v) => ignoredItemFraction = v, CommandLineParameterType.Optional);
parser.RegisterParameterHandler("--remove-occasional-cold-items", "Remove occasionally produced cold items", () => removeOccasionalColdItems = true);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
var splittingMapping = Mappings.StarRatingRecommender.SplitToTrainTest(
trainingOnlyUserFraction,
testUserRatingTrainingFraction,
coldUserFraction,
coldItemFraction,
ignoredUserFraction,
ignoredItemFraction,
removeOccasionalColdItems);
var inputDataset = RecommenderDataset.Load(inputDatasetFile);
var outputTrainingDataset = new RecommenderDataset(
splittingMapping.GetInstances(SplitInstanceSource.Training(inputDataset)),
inputDataset.StarRatingInfo);
outputTrainingDataset.Save(outputTrainingDatasetFile);
var outputTestDataset = new RecommenderDataset(
splittingMapping.GetInstances(SplitInstanceSource.Test(inputDataset)),
inputDataset.StarRatingInfo);
outputTestDataset.Save(outputTestDatasetFile);
return(true);
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string datasetFile = string.Empty;
string trainedModelFile = string.Empty;
string predictionsFile = string.Empty;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--data", "FILE", "Dataset to make predictions for", v => datasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--model", "FILE", "File with trained model", v => trainedModelFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--predictions", "FILE", "File with generated predictions", v => predictionsFile = v, CommandLineParameterType.Required);
if (!parser.TryParse(args, usagePrefix))
{
return false;
}
RecommenderDataset testDataset = RecommenderDataset.Load(datasetFile);
var trainedModel = MatchboxRecommender.Load<RecommenderDataset, User, Item, DummyFeatureSource>(trainedModelFile);
IDictionary<User, IDictionary<Item, int>> predictions = trainedModel.Predict(testDataset);
RecommenderPersistenceUtils.SavePredictedRatings(predictionsFile, predictions);
return true;
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string testDatasetFile = string.Empty;
string predictionsFile = string.Empty;
string reportFile = string.Empty;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--test-data", "FILE", "Test dataset used to obtain ground truth", v => testDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--predictions", "FILE", "Predictions to evaluate", v => predictionsFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--report", "FILE", "Evaluation report file", v => reportFile = v, CommandLineParameterType.Required);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
RecommenderDataset testDataset = RecommenderDataset.Load(testDatasetFile);
int minRating = Mappings.StarRatingRecommender.GetRatingInfo(testDataset).MinStarRating;
IDictionary <User, IEnumerable <Item> > recommendedItems = RecommenderPersistenceUtils.LoadRecommendedItems(predictionsFile);
var evaluatorMapping = Mappings.StarRatingRecommender.ForEvaluation();
var evaluator = new StarRatingRecommenderEvaluator <RecommenderDataset, User, Item, int>(evaluatorMapping);
using (var writer = new StreamWriter(reportFile))
{
writer.WriteLine(
"NDCG: {0:0.000}",
evaluator.ItemRecommendationMetric(
testDataset,
recommendedItems,
Metrics.Ndcg,
rating => Convert.ToDouble(rating) - minRating + 1));
}
return(true);
}
/// <summary>
/// Runs the module.
/// </summary>
/// <param name="args">The command line arguments for the module.</param>
/// <param name="usagePrefix">The prefix to print before the usage string.</param>
/// <returns>True if the run was successful, false otherwise.</returns>
public override bool Run(string[] args, string usagePrefix)
{
string testDatasetFile = string.Empty;
string predictionsFile = string.Empty;
string reportFile = string.Empty;
int minCommonRatingCount = 5;
var parser = new CommandLineParser();
parser.RegisterParameterHandler("--test-data", "FILE", "Test dataset used to obtain ground truth", v => testDatasetFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--predictions", "FILE", "Predictions to evaluate", v => predictionsFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--report", "FILE", "Evaluation report file", v => reportFile = v, CommandLineParameterType.Required);
parser.RegisterParameterHandler("--min-common-items", "NUM", "Minimum number of users that the query item and the related item should have been rated by in common; defaults to 5", v => minCommonRatingCount = v, CommandLineParameterType.Optional);
if (!parser.TryParse(args, usagePrefix))
{
return(false);
}
RecommenderDataset testDataset = RecommenderDataset.Load(testDatasetFile);
IDictionary <Item, IEnumerable <Item> > relatedItems = RecommenderPersistenceUtils.LoadRelatedItems(predictionsFile);
var evaluatorMapping = Mappings.StarRatingRecommender.ForEvaluation();
var evaluator = new StarRatingRecommenderEvaluator <RecommenderDataset, User, Item, int>(evaluatorMapping);
using (var writer = new StreamWriter(reportFile))
{
writer.WriteLine(
"L1 Sim NDCG: {0:0.000}",
evaluator.RelatedItemsMetric(testDataset, relatedItems, minCommonRatingCount, Metrics.Ndcg, Metrics.NormalizedManhattanSimilarity));
writer.WriteLine(
"L2 Sim NDCG: {0:0.000}",
evaluator.RelatedItemsMetric(testDataset, relatedItems, minCommonRatingCount, Metrics.Ndcg, Metrics.NormalizedEuclideanSimilarity));
}
return(true);
}
/// <summary>
/// Loads dataset from a given file.
/// <para>
/// Data file format:
/// Row starting with 'R' describes min and max ratings and has form 'R,Min,Max'.
/// Rows starting with 'U' describe a single user and have form 'U,UserId,UserFeatures'.
/// Rows starting with 'I' describe a single item and have form 'I,ItemId,ItemFeatures'.
/// Rows other than that describe instances and should have form 'UserID,ItemID,Rating'.
/// Feature description has form 'FeatureIndex1:Value1|FeatureIndex2:Value2|...'
/// If all the user features are zero or there are no user features in the dataset at all, the user description can be omitted. Same is true for items.
/// </para>
/// </summary>
/// <param name="fileName">File to load data from.</param>
/// <returns>The loaded dataset.</returns>
public static RecommenderDataset Load(string fileName)
{
var rawObservations = new List <Tuple <string, string, int> >();
var userIdToFeatures = new Dictionary <string, Vector>();
var itemIdToFeatures = new Dictionary <string, Vector>();
int?minRating = null, maxRating = null;
int userFeatureCount = 0, itemFeatureCount = 0;
var parsingContext = new FileParsingContext(fileName);
using (var reader = new StreamReader(fileName))
{
string line;
bool isFirstRecord = true;
while ((line = reader.ReadLine()) != null)
{
parsingContext.NextLine(line);
if (line.Length == 0 || line.StartsWith("#"))
{
continue; // Skip comments and empty lines
}
string[] splits = line.Split(',');
if (isFirstRecord)
{
//// Parse rating record
int minRatingValue = 0, maxRatingValue = 0;
if (splits.Length != 3 ||
splits[0].Trim() != "R" ||
!int.TryParse(splits[1], out minRatingValue) ||
!int.TryParse(splits[2], out maxRatingValue))
{
parsingContext.RaiseError("Invalid rating info record.");
}
minRating = minRatingValue;
maxRating = maxRatingValue;
isFirstRecord = false;
}
else if (splits[0].Trim() == "U")
{
//// Parse user record
if (splits.Length != 3)
{
parsingContext.RaiseError("Invalid user record.");
}
string userId = splits[1].Trim();
if (userIdToFeatures.ContainsKey(userId))
{
parsingContext.RaiseError("Record describing user '{0}' is presented more than once.", userId);
}
Vector features = ParseFeatures(splits[2], parsingContext, ref userFeatureCount);
userIdToFeatures.Add(userId, features);
}
else if (splits[0].Trim() == "I")
{
//// Parse item record
if (splits.Length != 3)
{
parsingContext.RaiseError("Invalid item record.");
}
string itemId = splits[1].Trim();
if (itemIdToFeatures.ContainsKey(itemId))
{
parsingContext.RaiseError("Record describing item '{0}' is presented more than once.", itemId);
}
Vector features = ParseFeatures(splits[2], parsingContext, ref itemFeatureCount);
itemIdToFeatures.Add(itemId, features);
}
else
{
//// Parse instance record
string userId = splits[0].Trim();
string itemId = splits[1].Trim();
int rating = 0;
if (splits.Length != 3 || !int.TryParse(splits[2], out rating))
{
parsingContext.RaiseError("Invalid instance record.", line);
}
rawObservations.Add(Tuple.Create(userId, itemId, rating));
}
}
}
if (!minRating.HasValue)
{
parsingContext.RaiseGlobalError("Rating info is missing.");
}
var result = new RecommenderDataset {
StarRatingInfo = new StarRatingInfo(minRating.Value, maxRating.Value)
};
foreach (var observation in rawObservations)
{
string userId = observation.Item1;
string itemId = observation.Item2;
int rating = observation.Item3;
if (rating < minRating.Value || rating > maxRating.Value)
{
parsingContext.RaiseGlobalError("One of the ratings is inconsistent with the specified rating info.");
}
User user = RetrieveEntity(userId, result.idToUser, userIdToFeatures, userFeatureCount, (id, features) => new User(id, features));
Item item = RetrieveEntity(itemId, result.idToItem, itemIdToFeatures, itemFeatureCount, (id, features) => new Item(id, features));
result.observations.Add(new RatedUserItem(user, item, rating));
}
return(result);
}