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Assignment 4 (A4) Machine Learning

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Assignment 4 (A4)
Machine Learning
General Info
10 Point Individual Assignment
Learning Objective
This assignment satisfies learning objective 2 (LO2) as specified in the syllabus. You will apply
conceptual knowledge of core AI concepts by implementing AI algorithms, analyzing existing
intelligent systems (including humans), and using existing AI tools to solve problems.
Getting Help
We want these projects to be rewarding and instructional, not frustrating and demoralizing. But,
we don’t know when or how to help unless you ask. If you find yourself stuck on something,
contact us via Piazza or come by the office hours. If you can’t make our office hours, let us know
and we will be happy to schedule alternate times.
Submission
You should submit the deliverables on Gradescope under Assignment 4. If you encounter any
difficulties during the submission process please contact us via email and also include a copy of
your submission files before the deadline.
Deliverables
You will need to submit the following files:
● A4.py
● <Identikey-TrainingData.csv
● <Identikey_A4_report.pdf
Instructions – MUST READ BEFORE GETTING STARTED
● You may email us your submission at any time to account for upload difficulties to
Gradescope and we can mark your submission “as-is” and timestamped with the email
receipt time.
● It is your responsibility to ensure that your submission passes the autograder.
Here are common autograder failures: (1) code does not run to completion locally; (2)
submitting a zipped directory; (3) including any additional libraries other than those
specified. We won’t be resolving errors in submissions that cause the autograder
to fail. If you’re having trouble passing the autograder come to office hours or post to
piazza, or email, but this all needs to be done before the deadline.
● For both parts we have provided initial code, please complete all questions within these
files. Do not submit iPython notebooks.
Prerequisites
For this assignment you will need some additional python libraries. You can install these using
pip. You may also need to install the prerequisites for these libraries also. More information can
be found on their respective manual pages.
pip install matplotlib, scikit-learn, pandas, numpy, pillow
Overview
The purpose of this assignment is to use a Hopfield network and a Multilayer Perceptron (MLP)
to recognize hand-drawn digits. We will focus on discriminating 5s from 2s. It is specifically
designed to give you experience with all the necessary steps in designing such a system
starting with generating your own data.
Part 1 – Data Preparation – [1 Pt]
First, you will prepare the data that will be used to train your models. For this, you will use the
5×5 grids provided in Appendix 1 (end of this document). Draw out the digits 5 and 2, four times
each (you can draw on paper or digitally draw), with some variation.
The next step is to digitize the data. For each box a digit crosses through, record a 1 in the
corresponding box of the 5×5 grid. Otherwise record a 0. This boolean (0 or 1) grid is used as
the training data for your network (see Appendix 2 for an example).
The third step is to format the data so it can be inputted into python. The boolean grid should be
saved in row major order in a single row of a CSV file (see Appendix 2). You also need to
supply a label – “five”, “two” – so each row is associated with a corresponding label of the digit
represented by the row.
See the attached file NewInput.csv for an example of how to format your data for python. The
first row contains headers and last column specifies the class label. You will use this file in Part
5 (do not use it before Part 5 except as an example for formatting input files).
You can check your data formatting using the provided function utils.vizualize which takes an
array of length 25, and displays the corresponding image. See skeleton code for an example.
What to submit
· Take a picture of your input grids and paste them in the report.
· Submit <Identikey-TrainingData.csv.
Part 2 – Hopfield Network – [5 Pts]
You will now implement, train and test a Hopfield network (see ‘HopfieldNotes.pdf’).
Implementation [4 points]
We have provided an initial class structure for you to use.
● addSinglePattern – update your hopfield network with one pattern
● Fit – update your hopfield network with a list of patterns
● retrieve – takes an input pattern as a parameter and uses your hopfield network to return
a retrieved pattern. If necessary you should set your own stopping criteria.
● Classify – take an input pattern as a parameter, use your retrieve method, then return a
string classification of either “two”, “five” or “unknown”.
Hint: You can do this by comparing the retrieved pattern to the ‘perfect’ patterns
provided on lines 6 and 7
Train and Test
Once you have implemented the Hopfield network, you should fit it on the two ‘perfect’ patterns
provided in the code. You should then attempt to classify each of the instances in your
<Identikey-TrainingData.csv file by using them as retrieval cues in the Hopefield network.
Training Data: The two ‘perfect instances provided in the code (lines 6 and 7)
Test Data: All of <Identikey-TrainingData.csv
Cross Validation: None since we have separate training and testing sets
In your report [1 point]
● How accurately did your network classify the digits? You may use percent accuracy as
the metric since the classes are evenly balanced.
● If it is making errors, analyze the results in order to understand where the Hopfield
network is making errors and explain them in your report. If it is not making errors, then
discuss why it is classifying perfectly.
Part 3 – Train a MLP – [1 Pt]
Using your generated dataset implement a MLP classifier using the function provided in
scikitLearn and the default parameters [0.5 points]
Training Data: The two ‘perfect instances provided in the code (lines 6 and 7)
Test Data: All of <indentikey-TrainingData.py
Cross Validation: None since we have separate training and testing sets
In your report [0.5 points]
● How accurately did your network classify the digits?
● If it is making errors, analyze the results in order to understand where the MLP is making
errors and explain them in your report. If it is not making errors, then discuss why it is
classifying the data perfectly.
Part 4 – Distortion – [2 Pts]
Perform an experiment to test the effect of distortion your Hopfield Network (from part 2) and
MLP (from part 3) when multiple levels of noise is introduced.
Distorting Your Input
We have provided a skeleton function to perform the distortion on each instance, complete this
function first.
distort_input takes as parameters one instance and a distortion rate, which should be a float
between 0 and 1. This is similar to mutation rate in an earlier assignment. For each bit in the
input array, if distortion rate is 0.1, there is a 0.1 probability that the bit will be flipped (1 changes
to 0 and 0 to 1).
Experiments
Once you have implemented the functions, you will experiment with how distortion rate impacts
your classifier accuracy. You will distort the instances from <indentikey-TrainingData.py
using distortion rates ranging from 0 to 0.5, in increments of 0.01. For each distortion rate, train
your hopfield network (from part 2), and MLP (from part 3) on undistorted ‘perfect instances’
(from parts 2 and 3) and then attempt to classify the distorted instances. You should then
calculate the accuracy for each classifier at each distortion rate.
As you increase the distortion rate at each step of your testing make sure you are passing
undistorted data to your distortion function and are only changing the distortion rate. If you pass
previously distorted data then you will quickly end up with data that is all noise.
Training Data: The two ‘perfect instances provided in the code (lines 6 and 7)
Test Data: Distorted instances
Cross Validation: None since we have separate training and testing sets
In your report
● Produce a line plot, with classifier accuracy on the y axis, and distortion rate on the x
axis. Your line plot should have two lines, one for your hopfield network and one for your
MLP.
● Provide a brief (1 to 2 sentences) commentary on your graph. What does this data tell
you about the two methods robustness to distortion.
Part 5 – Experimenting with number of hidden layers [1 Pt]
We have provided some additional data points in NewInput.csv. You should combine this with
your <indentikey-TrainingData.py and build a MLP where you vary the number of layers and
assess whether this improves performance on the distorted data.
Train: <indentikey-TrainingData.py + NewInput.csv
Test: Distorted instances
Cross Validation: None since we have separate training and testing sets
In your report [1 point]
● Report the results from your experiments with number of layers. Specifically, reproduce
the graph from Part 4, but now with an additional line for different versions of your MLP
(You still need to include the graph from Part 4 separately in your report). Briefly discuss
your findings.
APPENDIX 1 : Data Collection Grids
APPENDIX 2 : How to prepare Data Grids
1. Write the digit in the grid
2. Record the state of the cells (1 if black, 0 if white) in a grid
0 1 1 1 0
0 0 0 1 0
0 0 1 1 0
0 0 0 1 0
0 1 1 1 0
3. Convert the grid to row major form and save as a CSV file.
0 1 1 1 0 0 0 0 1 0 0 0 1 1 0 0 0 0 1 0 0 1 1 1 0
4. Check in visualizer
APPENDIX 3 : Scoring Rubric
The scoring rubric for your report is based on the Kentucky General Scoring Rubric from the
Kentucky Department of Education (KDE).
Score Description
Category 4
(Score
90%-100%)
● The student completes all important components of the task and
communicates ideas clearly.
● The student demonstrates in-depth understanding of the relevant
concepts and/or process.
● Where appropriate, the student chooses more efficient and/or
sophisticated processes.
● Where appropriate, the student offers insightful interpretations or
extensions (generalizations, applications, analogies).
Category 3
(Score
70%-90%)
● The student completes most important components of the task and
communicates clearly.
● The student demonstrates an understanding of major concepts even
though he/she overlooks or misunderstands some less important ideas
or details.
Category 2
(Score
60%-70%)
● The student completes some important components of the task and
communicates those clearly.
● The student demonstrates that there are gaps in his/her conceptual
understanding.
Category 1
(Score
10%-60%)
● The student shows minimal understanding.
● The student addresses only a small portion of the required task(s).
Category 0
(Score 0)
● Response is totally incorrect or irrelevant.
Blank
(Score 0)
● No response.

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