/// <summary>
/// Create an extracted Connect4 dataset (6 by 7 field).
/// The dataset is shuffled and one-hot-target-preprocessed.
/// </summary>
/// <param name="name">The optional name.</param>
/// <returns>The Connect4 dataset.</returns>
public static IDataset Connect4(string name = "connect4")
{
CsvRecordExtractor csvExtractor = new CsvRecordReader(
new MultiSource(new FileSource("connect-4.data"), new UrlSource("https://raw.githubusercontent.com/moroshko/connect4/master/connect-4.data")))
.Extractor("inputs", new[] { 0, 41 }, "targets", 42)
.AddValueMapping(42, "loss", "draw", "win");
Dictionary <object, object> mappings = new Dictionary <object, object>()
{
["x"] = 1,
["b"] = 0,
["o"] = -1
};
for (int i = 0; i < 42; i++)
{
csvExtractor.AddValueMapping(i, mapping: mappings);
}
var extractor = csvExtractor
.Preprocess(new OneHotPreprocessor("targets", 0, 2))
.Preprocess(new ShufflePreprocessor());
return(new ExtractedDataset(name, 67557, extractor));
}