def accuracy_test(rows):
"""Performs cross-out-one validation methods on the dataset passed."""
# Removing the label
rows = rows[1:]
total_accuracy = 0.0
total_elements = len(rows)
for i, row in enumerate(rows):
singled_out = row
rows.remove(row)
remaining_rows = rows
actual_label = row[-1]
dt = DecisionTree(remaining_rows)
node = dt.build_tree()
#node = build_tree(remaining_rows)
result = dt.classify(singled_out, node)
# either 'yes' or 'no' prediction
if len(result) == 1:
if actual_label in result:
total_accuracy += 1
continue
else:
total_accuracy += 0
continue
# both 'yes' and 'no' prediction
else:
prob_correct = result[actual_label]
if actual_label == 'yes':
incorrect_label = 'no'
else:
incorrect_label = 'yes'
prob_incorrect = result[incorrect_label]
total_prob = prob_correct + prob_incorrect
accuracy_for_this_test = prob_correct / total_prob
total_accuracy += accuracy_for_this_test
rows.append(singled_out)
final_accuracy = (total_accuracy / total_elements)
return final_accuracy
final_accuracy = (total_accuracy / total_elements)
return final_accuracy
if __name__ == '__main__':
data, filename = process_file()
print("This is a decision tree classifier program")
print("\nThe dataset you've chosen is {}".format(filename))
print("\nIf you wanted to experiment with a different dataset,")
print("please quit this program and enter:")
print("`python driver.py data_file.txt`")
print("You can choose from any files under the 'dataset/' directory.")
t = DecisionTree(data)
t.build_tree()
print("\n\n...Successfully built a classifer based on the datset")
print("\nIf you want to print the tree, hit 1. Otherwise, hit `enter`:\n")
see_tree = input()
if see_tree == '1':
print("Classification Tree from {} data".format(filename))
print("=============================================================")
t.print_tree()
print("=============================================================")
print(
"You can randomly choose a data point, and this program can classify")
print(
"that data point for you. Hit 1 if you want to test a random example")
print("Hit any key to skip.")
