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A pure-Python implementation for constructing a decision tree from multidimensional training data and for using the decision tree for classifying unlabeled data

Project description

Version 1.6 includes several upgrades: The module now includes code for generating synthetic training and test data for experimenting with the decision tree classifier. For another upgrade, the classifier can now be used in an interactive mode. In this mode, after you have constructed a decision tree, the user is prompted for answers to the questions pertaining to the feature tests at the nodes.

Version 1.5 should work with both Python 3.x and Python 2.x.

Assuming you have arranged your training data in the form of a table in a text file, all you have to do is to supply the name of the training datafile to this module and it does the rest for you without much effort on your part. A decision tree classifier consists of feature tests that are arranged in the form of a tree. The feature test associated with the root node is one that can be expected to maximally disambiguate the different possible class labels for an unlabeled data record. From the root node hangs a set of child nodes, one for each value of the feature at the root node. At each such child node, a feature test is selected that is the most class discriminative given that you have already applied the feature test at the root node and observed the value for that feature. This process is continued until you reach the leaf nodes of the tree. The leaf nodes may either correspond to the maximum depth desired for the decision tree or to the case when you run out of features to test.

Typical usage syntax:

dt = DecisionTree( training_datafile = “training.dat”, debug1 = 1 )



root_node = dt.construct_decision_tree_classifier()

root_node.display_decision_tree(” “)

test_sample = [‘exercising=>never’, ‘smoking=>heavy’,
‘fatIntake=>heavy’, ‘videoAddiction=>heavy’]

classification = dt.classify(root_node, test_sample)

print “Classification: “, classification

Project details

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