function train() {
  knn = new KNN(trainingSetX, trainingSetY, { k: K });
  test();
}
There are three different types of Iris flowers
that this dataset classifies.

1. Iris Setosa (Iris-setosa)
2. Iris Versicolor (Iris-versicolor)
3. Iris Virginica (Iris-virginica)

We are going to change these classes from Strings to numbers.
Such that, a value of type equal to
0 would mean setosa,
1 would mean versicolor, and
3 would mean virginica