private void LoadRelations(CrowdRecDataContainer container)
{
Console.WriteLine("Importing relations...");
foreach (var line in File.ReadAllLines(_relationsFile))
{
var tokens = line.Split('\t');
if (tokens.Length < 5)
{
throw new Exception("Expect 5 tab seperated fields.");
}
string relationType = tokens[0];
string relationId = tokens[1];
double temp;
double?timestamp;
if (double.TryParse(tokens[2], out temp))
{
timestamp = temp;
}
else
{
timestamp = null;
}
ItemRating ir = container.CreateItemRating(relationId, timestamp, tokens[3], tokens[4]);
container.Ratings.Add(ir);
}
}
private void LoadEntities(CrowdRecDataContainer container)
{
Console.WriteLine("Importing entities...");
foreach (var line in File.ReadAllLines(_entitiesFile))
{
var tokens = line.Split('\t');
string entityType = tokens[0];
string entityId = tokens[1];
double temp;
double?timestamp;
if (double.TryParse(tokens[2], out temp))
{
timestamp = temp;
}
else
{
timestamp = null;
}
string properties = tokens.Length > 3 ? tokens[3] : "{}";
if (entityType.ToLower() == "user")
{
container.Users.Add(entityId, container.CreateUser(entityId, timestamp, properties));
}
else if (entityType.ToLower() == "movie")
{
container.Items.Add(entityId, container.CreateItem(entityId, timestamp, properties));
}
}
}
private void LoadRelations(CrowdRecDataContainer container)
{
Console.WriteLine("Importing relations...");
foreach (var line in File.ReadAllLines(_relationsFile))
{
var tokens = line.Split('\t');
if (tokens.Length < 5)
throw new Exception("Expect 5 tab seperated fields.");
string relationType = tokens[0];
string relationId = tokens[1];
double temp;
double? timestamp;
if (double.TryParse(tokens[2], out temp))
timestamp = temp;
else
timestamp = null;
ItemRating ir = container.CreateItemRating(relationId, timestamp, tokens[3], tokens[4]);
container.Ratings.Add(ir);
}
}
private void LoadEntities(CrowdRecDataContainer container)
{
Console.WriteLine("Importing entities...");
foreach (var line in File.ReadAllLines(_entitiesFile))
{
var tokens = line.Split('\t');
string entityType = tokens[0];
string entityId = tokens[1];
double temp;
double? timestamp;
if (double.TryParse(tokens[2], out temp))
timestamp = temp;
else
timestamp = null;
string properties = tokens.Length > 3 ? tokens[3] : "{}";
if (entityType.ToLower() == "user")
container.Users.Add(entityId, container.CreateUser(entityId, timestamp, properties));
else if (entityType.ToLower() == "movie")
container.Items.Add(entityId, container.CreateItem(entityId, timestamp, properties));
}
}
public void RunDemo()
{
// step 1: load dataset
var container = new CrowdRecDataContainer();
var reader = new CrowdRecDataReader(_entitesFile, _relationsFile);
reader.LoadData(container);
var dataset = new ItemRatingDataset(container, 0.3f);
// step 2: recommender
var recommender = new MediaLiteRatingPredictor(new BiasedMatrixFactorization());
// step 3: evaluations
var pipline = new EvaluationPipeline<ItemRating>(new EvalutationContext<ItemRating>(recommender, dataset));
pipline.Evaluators.Add(new RMSE());
pipline.Evaluators.Add(new MAE());
pipline.Run();
}
public void RunDemo()
{
// step 1: load dataset
var container = new CrowdRecDataContainer();
var reader = new CrowdRecDataReader(_entitesFile, _relationsFile);
reader.LoadData(container);
var dataset = new ItemRatingDataset(container, 0.3f);
// step 2: recommender
var recommender = new MediaLiteRatingPredictor(new BiasedMatrixFactorization());
// step 3: evaluations
var pipline = new EvaluationPipeline <ItemRating>(new EvalutationContext <ItemRating>(recommender, dataset));
pipline.Evaluators.Add(new RMSE());
pipline.Evaluators.Add(new MAE());
pipline.Run();
}
