INF552 Assignment 1: Decision Tree Classifier


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Please use Python 3 to implement your homework assignment. In this assignment, you are
given a set of training data and a set of testing data generated from the same blackbox, say
blackbox11, which you may not know the secret function inside.

For blackbox11, you are given:
● blackbox11_train.csv: labeled training data generated from a blackbox11
● blackbox11_test.csv : unlabeled testing data
● blackbox11_example_predictions.csv: example output, which is also the true
class labels for blackbox11_test.csv so you can get to know the format of output
and measure your decision tree’s performance while you are developing your program.

Your task is to implement a decision tree learner, named as, that will
(1) construct a decision tree classifier from the given training data,
(2) use the learned tree classifier to classify the unlabeled test data, and
(3) output the predictions of your classifier on the test data into a file named
blackbox1*_predictions.csv in the same directory as the .py

Your program will take two input files and produce one output file as follows:
python3 training_data_path testing_data_path
⇒ prediction_file

For example,
python3 blackbox11_train.csv blackbox11_test.csv
⇒ blackbox11_predictions.csv

Note: input files may not be in the same directory as your python script .
In other words, your algorithm file will take labeled training data,
unlabeled testing data as input, and your classification predictions on testing data as output.
1 os.path.basename(path) can be used to extract the base name of pathname path.

In your implementation, please do not use any existing machine learning library call. You
must implement the algorithm yourself. Please develop your code yourself and do not copy from
other students or from the Internet.

The format of *_train.csv looks like:
x1, x2, y
Where x1 and x2 are the attribute values and y is the label, and *_test.csv are unlabeled.
Your output blackbox1*_predictions.csv will look like
… (A single column indicates the predicted labels for each unlabeled sample in the input
test file)

The format of your blackbox1*_predictions.csv file is crucial. It has to be in the exact
same name and format so that it can be parsed correctly to compare with true labels by
grading scripts.

When we grade your algorithm, we will use the same training data but some unlabeled hidden
testing data (generated from the same blackbox11) instead of the testing data that was given to
you. Your code will be autograded for technical correctness. Please name your file correctly, or
you will wreak havoc on the autograder.

Your submission:

● Submit your to Vocareum. See Appendix for more information.
● Create a single .zip ( which contains:
○ report.pdf, a brief report indicates your training accuracy, testing
accuracy and decision tree diagram for blackbox11, blackbox12, and
Submit your zipped file to the blackboard.


10 points in total
○ Program correctness(6 points): your program always works correctly and meets the
○ Documentation(2 points): your code is well commented and the submitted tree looks
○ Performance (2 points):
■ overall good performance on reported train and test accuracy (1 point)
■ accuracy on hidden testing data (1 point)


Homework must be submitted through Vocareum. Please only upload your code to the /work
directory. Don’t create any subfolder or upload any other files. Please refer to to get started with Vocareum.

How to submit

1. Log in to Vocareum website and you should see Assignment 1 under INF 552 Course
2. Click My Work
3. Select work folder on the left
4. You can either create a new file or upload files from your local machine. Make sure to
name your python file correctly based on homework description
5. Click on Submit and press Yes. You are able to submit as many times as you want
You can test your code on your local machine in the way described in the homework handout.
On vocareum, you only need to Submit, then the “Passed/Failed” message will appear
automatically. You can check your submission results in the Terminal or under Details tab. If
your code works correctly, you should see the results as below:
Submission Report
[Executed at: Sun Sep 8 18:32:08 PDT 2019]
blackbox11 passed, test accuracy: 90.0
blackbox12 passed, test accuracy: 90.0
blackbox13 passed, test accuracy: 90.0
Here, test accuracy is based on the test data given to you, so you can compare this with the
results on your local machine to make sure everything works properly on Vocareum.
After the deadline, your final submission will be graded using hidden test data, and you will be
able to see your grades on Vocareum.