The Program class

In the Program class, we added a third option to extract features and create the sample data .tsv file:

1. To begin, we modify the help text to indicate the new extract option that takes a path to the training folder:

if (args.Length != 2)
{
    Console.WriteLine($"Invalid arguments passed in, exiting.{Environment.NewLine}{Environment.NewLine}Usage:{Environment.NewLine}" +
                      $"predict <path to input file>{Environment.NewLine}" +
                      $"or {Environment.NewLine}" +
                      $"train <path to training data file>{Environment.NewLine}" + 
                      $"or {Environment.NewLine}" +
                      $"extract <path to folder>{Environment.NewLine}");

    return;
}

2. In addition, we also need to modify the main switch/case to support the extract argument:

switch (args[0])
{
    case "extract":
        new FeatureExtractor().Extract(args[1]);
        break;
    case "predict":
        new Predictor().Predict(args[1]);
        break;
    case "train":
        new Trainer().Train(args[1]);
        break;
    default:
        Console.WriteLine($"{args[0]} is an invalid option");
        break;
}