What does encircle values mean and stands for ? Where it come from?

MunchCrunch19

BalazsBaranyRM

Hi!

The values refer to the attribute that was selected for the split. In the first split, petal length, in the second one, petal width. 

When a decision tree splits a numerical attribute, it searches for a value that cleanly separates a class from others. The values were automatically chosen. 

In your case, you can read the tree like this:
If petal length is <= 1.9, then the class is Iris setosa.
If petal length is >  1.9 and petal width is <= 1.7, then the class is Iris versicolor in most of the cases.
Else it's Iris virginica.

Regards,
Balázs