When you are satisfied with the tree, right-click any blank space in the Tree
visualizer view and choose Accept The Tree. Weka evaluates the tree against the test
set and outputs statistics that show how well you did.
Exercise 17.2.12. You are competing for the best accuracy score of a
hand-built UserClassifier produced on the segment-challenge dataset and
tested on the segment-test set. Try as many times as you like. When you
have a good score (anything close to 90% correct or better), right-click the
corresponding entry in the Result list, save the output using Save result
buffer, and copy it into your answer for this exercise. Then run J48 on
the data to see how well an automatic decision tree learner performs on
the task.