# Author: J Zabkar
# Version: 1.0
# Description: Demostration of use of orngTree module: prin out
# a tree in text and dot format
# Category: modelling
# Uses: iris
# Referenced: orngTree.htm
import orange, orngTree
data = orange.ExampleTable("iris.tab")
tree = orange.TreeLearner(data)
orngTree.printTree(tree)
orngTree.printDot(tree, fileName="tree1.dot")
# Author: J Zabkar
# Version: 1.0
# Description: Pre-prunning of classification tree using orngTree module
# Category: modelling
# Uses: iris.tab
# Referenced: orngTree.htm
import orange, orngTree
data = orange.ExampleTable("iris.tab")
print "BIG TREE:"
tree1 = orngTree.TreeLearner(data)
orngTree.printTree(tree1, leafStr="%m", nodeStr=".")
print "\nPRE-PRUNED TREE:"
tree2 = orngTree.TreeLearner(data, maxMajority=0.7)
orngTree.printTree(tree2, leafStr="%m", nodeStr=".")
# Author: J Zabkar
# Version: 1.0
# Description: Pre-prunning of classification tree using orngTree module
# Category: modelling
# Uses: iris.tab
# Referenced: orngTree.htm
import orange, orngTree
data = orange.ExampleTable("iris.tab")
print "BIG TREE:"
tree1 = orngTree.TreeLearner(data)
orngTree.printTree(tree1, leafStr="%m", nodeStr=".")
print "\nPRE-PRUNED TREE:"
tree2 = orngTree.TreeLearner(data, maxMajority=0.7)
orngTree.printTree(tree2, leafStr="%m", nodeStr=".")
import orange, orngTree
reload(orngTree)
data = orange.ExampleTable("iris")
tree = orngTree.TreeLearner(data, maxDepth=3)
formats = ["", "%V (%M out of %N)", "%V (%^MbA%, %^MbP%)",
'%C="Iris-versicolor" (%^c="Iris-versicolor"% of node, %^CbA="Iris-versicolor"% of versicolors)',
"%D", "%.2d"]
for format in formats:
print '\n\n*** FORMAT: "%s"\n' % format
orngTree.printTree(tree, leafStr=format)
formats2 = [("%V", "."), ('%^.1CbA="Iris-virginica"% (%^.1CbP="Iris-virginica"%)', '.'), ("%V %D %.2DbP %.2dbP", "%D %.2DbP %.2dbP")]
for fl, fn in formats2:
orngTree.printTree(tree, leafStr=fl, nodeStr=fn)
data = orange.ExampleTable("housing")
tree = orngTree.TreeLearner(data, maxDepth=3)
formats = ["", "%V"]
for format in formats:
print '\n\n*** FORMAT: "%s"\n' % format
orngTree.printTree(tree, leafStr=format)
formats2 = [("[SE: %E]\t %V %I(90)", "[SE: %E]"), ("%C<22 (%cbP<22)", "."), ("%C![20,22] (%^cbP![20,22]%)", ".")]
for fl, fn in formats2:
orngTree.printTree(tree, leafStr=fl, nodeStr=fn)
tree = orngTree.TreeLearner(data, maxDepth=3)
def getMargin(dist):
if dist.abs < 1e-30:
return 0
l = list(dist)
l.sort()
return (l[-1] - l[-2]) / dist.abs
def replaceB(strg, mo, node, parent, tree):
margin = getMargin(node.distribution)
by = mo.group("by")
if margin and by:
whom = orngTree.byWhom(by, parent, tree)
if whom and whom.distribution:
divMargin = getMargin(whom.distribution)
if divMargin > 1e-30:
margin /= divMargin
else:
orngTree.insertDot(strg, mo)
else:
return orngTree.insertDot(strg, mo)
return orngTree.insertNum(strg, mo, margin)
myFormat = [(re.compile("%"+orngTree.fs+"B"+orngTree.by), replaceB)]
orngTree.printTree(tree, leafStr="%V %^B% (%^3.2BbP%)", userFormats = myFormat)
def getMargin(dist):
if dist.abs < 1e-30:
return 0
l = list(dist)
l.sort()
return (l[-1] - l[-2]) / dist.abs
def replaceB(strg, mo, node, parent, tree):
margin = getMargin(node.distribution)
by = mo.group("by")
if margin and by:
whom = orngTree.byWhom(by, parent, tree)
if whom and whom.distribution:
divMargin = getMargin(whom.distribution)
if divMargin > 1e-30:
margin /= divMargin
else:
orngTree.insertDot(strg, mo)
else:
return orngTree.insertDot(strg, mo)
return orngTree.insertNum(strg, mo, margin)
myFormat = [(re.compile("%" + orngTree.fs + "B" + orngTree.by), replaceB)]
orngTree.printTree(tree, leafStr="%V %^B% (%^3.2BbP%)", userFormats=myFormat)
