Let’s first load the Iris dataset. This is a very famous dataset in almost all data mining, machine learning courses, and it has been an R build-in dataset. The dataset consists of 50 samples from each of three species of Iris flowers (Iris setosa, Iris virginicaand Iris versicolor). Four features(variables) were measured from each sample, they are the length and the width of sepal and petal, in centimeters. It is introduced by Sir Ronald Fisher in 1936.