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COMP 2019 Assignment 2 – Machine Learning
Please submit your solution via LEARNONLINE. Submission instructions are given at the end of this assignment.
This assessment is due on Sunday, 14 June 2019, 11:59 PM.
This assessment is worth 20% of the total marks.
In this assignment you will aim to identify which hand gesture is being performed based on recorded
Electromyography (EMG) data. You will perform machine learning tasks, including training a classifier,
assessing its output, and optimising its performance. You will document your findings in a written report.
Write concise explanations; approximately one paragraph per task will be sufficient.
Download the data file for this assignment from the course website (file EMG.zip). The archive contains the
data file in CSV format, and some python code that you may use to visualise a decision tree model.
Before starting this assignment, ensure that you have worked through the three Machine Learning modules
and Practicals 2&3. The tasks set in this assignment require understanding of the Python programming
language, the Jupyter Python notebook environment, and an overall understanding of machine learning
training and evaluation methods using the scikit-learn python library. You will need a working Python 3.x
system with the Jupyter Notebook environment and the ‘sklearn’ package installed.
The Anaconda 3 Python distribution (https://www.anaconda.com/distribution/) is recommended, as it
includes the packages and tools required for this assignment.
Documentation that you may find useful:
• Python: https://www.python.org/doc/
• Jupyter: https://jupyter-notebook.readthedocs.io/en/stable/
• Scikit-learn: http://scikit-learn.org/stable/
• Numpy: https://docs.scipy.org/doc/
• Pandas: https://pandas.pydata.org/ (optional, for reading the data file)
Preparation
Create a Jupyter notebook and set the random state based on your student ID.
import numpy as np
np.random.seed(1234) # use your StudentID in place of 1234.
Include this this code as the preamble to your code in the Jupyter notebook.
Then, load the data. Use
import numpy as np
data = np.loadtxt(‘EMG.csv’,skiprows=1,delimiter=’,’)
to load the data. Type this code into the notebook. You will get a syntax error if you copy and paste from this
document. Students familiar with the Pandas library may use that to load and explore the data instead.
Familiarise yourself with the data. There are 65 columns and 11678 rows. The first 64 columns represent the
predictors, and the 65th column represents the target label. The 64 predictors are organised in 8 blocks,
where each block corresponds to Electromyography (EMG) data obtained at the same time instant. There
are 8 time instants, 0,…,7. In each block there are readings from 8 sensors (S1,…,S8). Hence, the column
titled “S2_3” contains sensor readings taken from the second sensor, S2, at the fourth time instant.
The last column, titled Target, represents the gesture that was performed while taking the sensor readings.
There are four gestures, each encoded as an integer in the range {0,…,3}.
Explore the distribution of data in each column.
Task 1: Report
Write a concise report showing your analysis for Questions 1-6 described below.
Demonstrate that you have followed appropriate training and evaluation procedures and justify your
conclusions with relevant evidence from the evaluation output.
As part of the assignment you will need to decide and justify which training and evaluation procedures are
appropriate for this data set and the given questions.
Where there are alternatives (e.g. measures, procedures, models, conclusions), demonstrate that you have
considered all relevant alternatives and justify why the selected alternative is appropriate.
Ensure that the report is professionally presented and self-contained.
Do not include the python code in your report; instead, select relevant output from your program for use in
justifications and discussion. Do not copy and paste the entire output into the report. The Jupyter notebook
containing your code and complete output will be submitted as a separate deliverable.
Question 1: Evaluation Metric
Choose an appropriate measure to evaluate the classifier.
Select among Accuracy, F1-measure, Precision, Recall, or ROC curve.
Justify your selection.
Note that you will need to use the same measure for all tasks in this Assignment.
Question 2: Baseline
Construct a classifier that always predicts the majority class (as seen in the training data) for each sample.
What performance can we expect from this simple model when applied to new data?
Use a confusion matrix and/or classification report to support your analysis.
Question 3: Nearest Neighbour
Train a k Nearest Neighbour classifier (KNeighborsClassifier) to predict Target.
Use the Euclidean distance, 5 neighbours, and uniform weighting for the classifier. This should be the default
offered by sklearn for this classifier.
Ensure that you follow correct training and evaluation procedures.
1. Assess how well the classifier performs on the prediction task.
2. What performance can we expect from the trained model if we applied it to new data?
Question 4: Decision Tree
Train a DecisionTreeClassifier to predict Target. Use the default parameter values for the classifier (that is,
don’t specify your own values).
Ensure that you follow correct training and evaluation procedures.
1. Assess how well the classifier performs on the prediction task.
2. What performance can we expect from the trained model if we applied it to new data?
If you wish to visualise the decision tree you can use function print_dt provided in dtutils.py in the
Assignment 2 zip archive:
import dtutils
dtutils.print_dt(tree, feature_names=flabels)
where tree refers to the trained decision tree model, and flabels is a list of features names (columns) in the
data. This function prints a hierarchical representation of the tree where nodes deeper in the tree are
indented further. For internal nodes, the children are shown. For leaf nodes, the class label associated with
the node is shown, as well as the frequency of each class among the samples associated with the node (in
square brackets).
Question 5: Diagnosis
Does the Decision Tree model suffer from overfitting or underfitting? Justify what problem exists, if any, and
describe how you have arrived at your assessment.
If the model exhibits overfitting or underfitting, revise your training procedure to remedy the problem, and
re-evaluate the improved model. The DecisionTreeClassifier has a number of parameters that you can
consider for tuning the model:
• max_depth: maximum depth of the tree
• min_samples_split: minimum number of samples required to split an internal node in the tree
• max_leaf_nodes: maximum number of leaf nodes in the tree
• min_samples_leaf: minimum number of samples per leaf nodes
Question 6: Recommendation
Which of the models you trained should be selected for the prediction task?
Ensure that you use the appropriate results for making a decision.
Justify your recommendation.
Submission Instructions
Submit a single zip archive containing the following:
• emg.ipynb: the Jupyter Notebook file (in ipynb format).
• emg.html: the HTML version of emg.ipynb showing the notebook including all output. Create this by
selecting File>Download as>HTML after having run all cells in the Jupyter notebook.
• emg.pdf: the report as specified in Task 1 (i.e. your answers to questions 1-6) in PDF format
Restart your python kernel and run all cells from the top to ensure your code runs without errors prior to
saving the notebook and its HTML version.
Please check that all files are in the appropriate format before submitting.
Marking Scheme
Question Marks
Q1: Metrics
Appropriate measure selected and justified
10
Q2: Baseline
Appropriate measure selected and justified
10
Q3: k Nearest Neighbour
Correct training procedure applied
Correct evaluation procedure applied
Correct conclusion & analysis
15
Q4: Decision Tree
Correct training procedure applied
Correct evaluation procedure applied
Correct conclusion & analysis
15
Q5: Diagnosis
Correct diagnosis
Correct revised training and evaluation procedure applied
25
Q6: Recommendation
Correct recommendations
Recommendations justified by evaluation results
15
Report format
Well-structured report
Professional presentation
Free of grammar and spelling errors
Describes the training process and assessment procedures used along
with the findings
Includes only relevant data with related discussion
Does not include code
10
Jupyter notebook
Random state set based on Student ID at the start of each question
Executes correctly when using Run All from the top
Contains only relevant code, no errors
Uses only packages/code mentioned in this assignment
Copy saved as HTML format submitted
Matches the contents of the report
Deductions apply if criteria are
not met
No marks will be awarded for a question if the code in the notebook and section in the report are missing or
don’t align with each other. It is not sufficient to submit only a report or only code.

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