static void Main(string[] args)
{
string errorMessage = "";
if (!File.Exists(MovieTitlesPath))
{
errorMessage += $"Failed to find file ${MovieTitlesPath} - please update variable ${nameof(MovieTitlesPath)} or create that file.\n";
}
if (!File.Exists(UserRatingsTrainingPath))
{
errorMessage += $"Failed to find file ${UserRatingsTrainingPath} - please update variable ${nameof(UserRatingsTrainingPath)} or create that file.\n";
}
if (!File.Exists(UserRatingsTestPath))
{
errorMessage += $"Failed to find file ${UserRatingsTestPath} - please update variable ${nameof(UserRatingsTestPath)} or create that file.\n";
}
if (errorMessage != "")
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Not all files available - not running!");
Console.WriteLine(errorMessage);
Console.ResetColor();
Console.WriteLine("Press any key to continue...");
Console.ReadKey();
return;
}
var startTime = DateTime.Now;
Console.WriteLine(startTime);
Console.WriteLine("Parsing the input files...");
Dictionary <int, string> movieTitles = CsvParserUtils.ParseCsvAsList <Movie>(MovieTitlesPath).ToDictionary(n => n.MovieId, n => n.Title);
UserCache trainingSetCache = UserCache.BuildUserCache(UserRatingsTrainingPath);
UserCache testingSetCache = UserCache.BuildUserCache(UserRatingsTestPath);
Console.WriteLine("Initializing predictors...");
PearsonCoefficientCalculator pearsonCalculator = new PearsonCoefficientCalculator(trainingSetCache);
MovieScorePredictor predictor = new MovieScorePredictor(pearsonCalculator);
// NOTE: feel free to comment out any of the lines below depending on what you want to execute
MakePredictionsOnTestFileAndCalculateError(predictor, testingSetCache);
MakeMovieRecommendationsForUser999999InTrainingSet(predictor, trainingSetCache, movieTitles);
var endTime = DateTime.Now;
Console.WriteLine(endTime);
var totalMinutes = (endTime - startTime).TotalMinutes;
Console.WriteLine("Took {0} minutes.", totalMinutes);
Console.WriteLine("Press any key to quit...");
Console.ReadKey();
}
public MovieScorePredictor(PearsonCoefficientCalculator pearsonCalculator)
{
_pearsonCalculator = pearsonCalculator;
}
