public static void LoadMatrixFromTxt()
{
var checks = new Checks("Load matric from txt");
var handle = XgBoostWrapper.CreateDMatrixFromFile("agaricus.txt.train", silent: 0);
var rowCount = XgBoostWrapper.GetDMatrixRowCount(handle);
XgBoostWrapper.FreeDMatrix(handle);
checks.IsEqual(6513, rowCount, "Rowcount check");
checks.PrintReport();
}
public static void LoadMatrixFromDense()
{
var checks = new Checks("Load matric from dense");
var mat = new DenseMatrix(20, 10);
mat[1, 5] = 1; mat[1, 6] = 2;
mat[2, 3] = 3; mat[3, 8] = 4;
mat[4, 1] = 5; mat[4, 7] = 6;
var handle = XgBoostWrapper.CreateDMatrixFromDenseMatrix(mat.Data, mat.RowCount, mat.ColCount);
checks.IsEqual(20, XgBoostWrapper.GetDMatrixRowCount(handle), "Rowcount check");
XgBoostWrapper.FreeDMatrix(handle);
checks.PrintReport();
}
public static void TestBooster()
{
var checks = new Checks("Test booster");
var trainHandle = XgBoostWrapper.CreateDMatrixFromFile("agaricus.txt.train");
var testHandle = XgBoostWrapper.CreateDMatrixFromFile("agaricus.txt.test");
var boosterHandle = XgBoostWrapper.CreateBooster(new IntPtr[] { trainHandle, testHandle });
XgBoostWrapper.BoosterUpdateOneIter(boosterHandle, 1, trainHandle);
var res1 = XgBoostWrapper.BoosterEvalOneIter(boosterHandle, 1, new IntPtr[] { trainHandle }, new string[] { "train" });
var rmse1 = double.Parse(res1.Split(':')[1], CultureInfo.InvariantCulture);
XgBoostWrapper.BoosterUpdateOneIter(boosterHandle, 2, trainHandle);
var res2 = XgBoostWrapper.BoosterEvalOneIter(boosterHandle, 2, new IntPtr[] { trainHandle }, new string[] { "train" });
var rmse2 = double.Parse(res2.Split(':')[1], CultureInfo.InvariantCulture);
checks.IsTrue(rmse1 > rmse2, "Train error should go dowm");
XgBoostWrapper.FreeDMatrix(trainHandle);
XgBoostWrapper.FreeDMatrix(testHandle);
// XgBoostWrapper.FreeBooster(boosterHandle);
checks.PrintReport();
}
