Added decision tree example beautiful graphviz

Author: mGalarnyk

.DS_Store

@@ -1,6 +1,6 @@
 digraph Tree {
 node [shape=box] ;
-0 [label="petal width (cm) <= 0.8\ngini = 0.665\nsamples = 112\nvalue = [37, 34, 41]\nclass = virginica"] ;
+0 [label="petal length (cm) <= 2.35\ngini = 0.665\nsamples = 112\nvalue = [37, 34, 41]\nclass = virginica"] ;
 1 [label="gini = 0.0\nsamples = 37\nvalue = [37, 0, 0]\nclass = setosa"] ;
 0 -> 1 [labeldistance=2.5, labelangle=45, headlabel="True"] ;
 2 [label="petal length (cm) <= 4.95\ngini = 0.496\nsamples = 75\nvalue = [0, 34, 41]\nclass = virginica"] ;

Sklearn/.DS_Store

@@ -0,0 +1,12 @@
+digraph Tree {
+node [shape=box] ;
+0 [label="petal length (cm) <= 2.35\ngini = 0.665\nsamples = 112\nvalue = [37, 34, 41]\nclass = virginica"] ;
+1 [label="gini = 0.0\nsamples = 37\nvalue = [37, 0, 0]\nclass = setosa"] ;
+0 -> 1 [labeldistance=2.5, labelangle=45, headlabel="True"] ;
+2 [label="petal length (cm) <= 4.95\ngini = 0.496\nsamples = 75\nvalue = [0, 34, 41]\nclass = virginica"] ;
+0 -> 2 [labeldistance=2.5, labelangle=-75, headlabel="False", arrowsize=1.7, penwidth = 3] ;
+3 [label="gini = 0.153\nsamples = 36\nvalue = [0, 33, 3]\nclass = versicolor"] ;
+2 -> 3 [labeldistance=2.5, labelangle=45, headlabel="True"] ;
+4 [label="gini = 0.05\nsamples = 39\nvalue = [0, 1, 38]\nclass = virginica"] ;
+2 -> 4 [labeldistance=2.5, labelangle=-75, headlabel="False", arrowsize=1.7, penwidth = 3];
+}