Esempio n. 1
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# 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")
Esempio n. 2
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# 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=".")
Esempio n. 3
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# 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=".")
Esempio n. 4
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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)
Esempio n. 5
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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)
Esempio n. 6
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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)