static void Main(string[] args)
{
if (!File.Exists("data/data-full.txt"))
{
Console.WriteLine("Could not find file \"data-full.txt\" in the relative directory \"data\". Please make sure the required data is located in said directory.");
Console.ReadKey();
return;
}
var csvOptions = new CsvParserOptions(true, ',');
var csvMovieMapping = new CsvMovieMapping();
var csvMovieDescriptionMapping = new CsvMovieDescriptionMapping();
var movieParser = new CsvParser <Movie>(csvOptions, csvMovieMapping);
var descriptionParser = new CsvParser <MovieDescription>(csvOptions, csvMovieDescriptionMapping);
Console.WriteLine("Reading movie data in from \"data/data-full.txt\"...");
var elapsed = TimeUtilities.MeasureDuration(() => movieParser.ReadFromFile("data/data-full.txt", Encoding.ASCII).ToList(), out var data);
var movies = data.Where(x => x.IsValid).Select(x => x.Result).ToList();
Console.WriteLine($"Data loaded in {elapsed.TotalSeconds} second(s).");
List <MovieDescription> descriptions = new List <MovieDescription>();
if (File.Exists("data/movie_names.txt"))
{
Console.WriteLine("Reading optional movie description data in from \"data/movie_names.txt\"...");
elapsed = TimeUtilities.MeasureDuration(() => descriptionParser.ReadFromFile("data/movie_names.txt", Encoding.ASCII).ToList(), out var descriptionData);
descriptions.AddRange(descriptionData.Where(x => x.IsValid).Select(x => x.Result));
Console.WriteLine($"Data loaded in {elapsed.TotalSeconds} second(s).");
}
Console.WriteLine("Training the recommendation system...");
var recommendationSystem = new RecommendationSystem <Movie>(x => x.MovieId, x => x.UserId, x => x.Rating,
x => descriptions.FirstOrDefault(y => y.MovieId == x)?.Title ?? x.ToString());
elapsed = TimeUtilities.MeasureDuration(() => recommendationSystem.LoadModel(movies));
Console.WriteLine($"Recommendation system trained in {elapsed.TotalMinutes} minute(s).");
var continueLoop = true;
while (continueLoop)
{
Console.WriteLine("\nEnter a user ID to predict a rating for:");
var userParseSuccess = int.TryParse(Console.ReadLine(), out var userId);
Console.WriteLine("Enter a movie ID to predict a rating for:");
var movieParseSuccess = int.TryParse(Console.ReadLine(), out var movieId);
var rating = recommendationSystem.PredictUserRating(userId, movieId);
Console.WriteLine($"User \"{userId}\" would most likely rate the movie " +
$"\"{descriptions.FirstOrDefault(x => x.MovieId == movieId)?.Title ?? movieId.ToString()}\" {Math.Round(rating, 2)} out of 5.");
Console.WriteLine("Enter another? (Y/n)");
continueLoop = Console.ReadLine().Trim().ToUpperInvariant() == "Y";
}
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
public UnitTest1()
{
recommandationSystem = new RecommendationSystem();
}
