JC3509编程代做、代写Python程序设计

日期：2024-03-30 07:54

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University of Aberdeen

South China Normal University

Aberdeen Institute of Data Science

& Artificial Intelligence.

BSc in Artificial Intelligence 2023 – 2024

**Please read all the information below carefully**

Assessment I Briefing Document – Individually Assessed (no teamwork)

Course: JC3509 – Machine Learning Note: This part of assessment accounts for

30% of your total mark of the course.

Learning Outcomes

On successful completion of this component a student will have demonstrated competence in the

following areas:

? Ability to identify, prepare, & manage appropriate datasets for analysis.

? Ability to appropriately present the results of data analysis.

? Ability to analyse the results of data analyses, and to evaluate the performance of analytic

techniques in context.

? Knowledge and understanding of analytic techniques, and ability to appropriately apply

them in context, making correct judgements about how this needs to be done.

Information for Plagiarism and Conduct: Your submitted report may be submitted for

plagiarism check (e.g., Turnitin). Please refer to the slides available at MyAberdeen for more

information about avoiding plagiarism before you start working on the assessment. Please also read

the following information provided by the university: https://www.abdn.ac.uk/sls/onlineresources/avoiding-plagiarism/

In addition, please familiarise yourselves with the following document “code of practice on student

discipline (Academic)”: https://tinyurl.com/y92xgkq6

Report Guidance & Requirements

Your report must conform to the below structure and include the required content as outlined in each

section. Each subtask has its own marks allocated. You must supply a written report, along with the

corresponding code, containing all distinct sections/subtasks that provide a full critical and reflective

account of the processes undertaken.

Overview

This assignment tasks you to undertake the full machine learning pipeline, including data handling

and processing, model construction and training, and evaluation of the developed methods. You are

tasked to create a neural network to classify data into 3 categories.

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**Please read all the information below carefully**

The dataset needed to fulfil the requirements of this assessment can be found in MyAberdeen.

Data:

This data contains the chemical properties of food product produced by 3 different manufacturers.

The purpose of this experiment is to explore the relationship between the chemical measures listed

below and the manufacturer of the food product. The data has 177 records, where the first column

“Producer” indicates which manufacturer produced the analyses sample. The features of the dataset

are the following:

? Producer – Manufacturer of the product (TARGET).

? Amino_acid – The total percentage content of animo acid.

? Malic_acid – The percentage content of malic acid.

? Ash – The measure of ash present in the product.

? Alc – The alcalinity of ash present.

? Mg – The measure of magnesium.

? Phenols – The total measure of phenols.

? Flavanoids – The measure of flavonoid phenols in the product.

? Nonflavanoid_phenols – The measure of non-flavonoid phenols in the product.

? Proanth – Proanthocyanins measure.

? Colo_int – The color intensity.

? Hue – Hue of the color.

? OD – The protein content of the product.

? Proline – The measure of proline amino acids.

Objectives:

The main purpose of employing this data is the following:

1. Classification: to determine the origin (manufacturer) of the product given analytical

measurements.

2. Analysis: to infer which analytical factors would potentially influence the classification of

the product.

In order to achieve these objectives, we would like to accomplish the following subtasks using

machine learning.

Submission

Please provide the follow:

1. A written report explaining the steps undertaken for each task, and the decisions behind each

choice. You are expected to use machine learning principles to explain your results with

graphs and/or tables.

2. A code submission, comprising of ONE commented python file with all code needed to

replicate the findings in the written report.

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**Please read all the information below carefully**

Task 1 – Data Preparation (10 Marks)

Subtasks:

1. Import the dataset: Please provide a short description of the data provided and import the data

into your programming environment; provide snippets of code for these purposes.

2. Preprocess the data: If you did any preprocessing over the data, e.g., normalization, please

explain it and the reasons why you did that preprocessing; if you did not do any preprocessing,

also please explain.

Task 2 – Model Construction (50 Marks)

You are tasked to build simple fully connected artificial neural network from scratch to classify the

records into 3 categories (1, 2, or 3).

You are not permitted to use any machine learning or statistical libraries, you are expected to

construct the neural network from scratch, i.e. only using core Python and NumPy.

Subtasks:

1. Loss function: Select and implement an appropriate loss function, explain why you have

selected that loss function in relation to the data and the problem.

2. Network Design: Construct a fully connected neural network with at least one hidden layer.

Explain your architectural choice and demonstrate by code snippets, tests, and written

explanation that your code operates as expected. To achieve this, you will need to implement

both:

a. The Forward Pass.

b. The Backward Pass.

3. Gradient Descent: Update the weights by mini-batch stochastic gradient descent.

Demonstrate by code snippets, tests, and written explanation that the weights are being

updated. You can use advanced optimisation tricks if you wish i.e. momentum.

NOTE: If you are unable to complete the above tasks, you are permitted to use additional libraries

(i.e. PyTorch) however, this will result in a deduction of 20 marks.

Task 3 – Model Training (15 Marks)

Take the model from the previous task and train it on the data you pre-processed in Task 1. Ensure

that you train your model on a sub-set of the data, holding out a subset for validation.

Subtasks:

1. Model Training: Perform training and parameter selection on the training set.

2. Module Regularisation: Implement a regularisation method, briefly explain (Max 200 words)

how it works in the context of your code, use code snippets to help.

3. Model inference: Validate the model by performing inference on the held-out validation data.

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**Please read all the information below carefully**

Task 4 – Evaluation (25 Marks)

Evaluate the performance of your trained classifier and employ machine learning principles to

explain your results with graphs and/or tables. In addition, perform some analyses on the trained

model to better understand which analytical factors would potentially influence the classification of

the product.

Subtasks:

1. Present Results: Present the results of your classifier via appropriate metrics for the problem

statement.

2. Plot: Plot the loss curve for training and validation, answer the following questions:

a. What does your loss curve tell you?

b. Are you observing any overfitting or underfitting?

c. Does the addition of regularisation help?

3. Explain Results: Explain the results from the previous subtasks in context of the problem

statement/setting.

Marking Criteria

? Depth and breadth of knowledge.

? Technical details of formalisation, implementation and pseudo-code.

? Communication skills (clear, technical contents and sound reasoning)

? Structure of document.

Submission Instructions

You should submit a PDF version of your report and the accompanying code to the Codio

environment. For the deadline of this assessment, please check it on MyAberdeen. The name of the

PDF file should have the form “JC3509_Assessment1 _< your Surname>_<your first

name>_<Your Student ID>”. For instance, “JC3509_Assessment1_Smith_John_4568985.pdf”,

where 4568985 is your student ID.

Any questions pertaining to any aspects of this assessment, please address them to the course

coordinator Aiden Durrant, aiden.durrant@abdn.ac.uk