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I need (1000 words)on Character Classification with a Multi-Layer Perceptron

26/08/2020 Client: suns Deadline: 3 days

MNIST Written CharacterClassification with a Multi-Layer Perceptron

Learning Outcomes

1.Evaluate and articulate the issues and challenges in machine learning, including

model selection, complexity and feature selection

2.Demonstrate a working knowledge of the variety of mathematical techniques

normally adopted for machine learning problems, and of their application to creating

effective solutions

3.Critically evaluate the performance and drawbacks of a proposed solution to a

machine learning problem4.Create solutions to machine learning problems using

appropriate software.

Data set

The dataset MNIST contains images of hand-written characters 0-9. The task is to

take an image as input and determine which of the numbers 0-9 is written in it. The

dataset is an industry standard and one of the most common benchmarks for new

classification algorithms. The dataset and information about it can be found here:

http://yann.lecun.com/exdb/mnist/ .

The dataset is already pre-structured into training and test sets, which can be

downloaded on the homepage. Performances of common algorithms on this

database are well known and also documented as error-rates on the test set on the

homepage.The dataset can be easily read into Matlab or Octave with commonly

available helper scripts such as on

http://ufldl.stanford.edu/wiki/index.php/Using_the_MNIST_Dataset .

% Change the filenames if you've saved the files under

different names

% On some platforms, the files might be saved as

% train-images.idx3-ubyte / train-labels.idx1-ubyte

images = loadMNISTImages('train-images-idx3-ubyte');

labels = loadMNISTLabels('train-labels-idx1-ubyte');

% We are using display_network from the autoencoder

codedisplay_network(images(:,1:100)); % Show the first 100

imagesdisp(labels(1:10));

Machine Learning and Evaluation

For this coursework you will program and use the Backpropagation learning

algorithm for Multi-Layer Perceptrons (a.k.a. “Deep Learning”) in Matlab/Octave. The

attached Matlab file provides a stub for the neural network code with data members

and a constructor already in place. Fill in the methods to initialize the weights, to

compute the output of the network for a given input, as well as methods to train the

network by means of the backpropagation algorithm. Use of the template is

compulsory. Implementations outside the template design will not be accepted

unless explicitly and individually agreed by the module leader. The network

implementation must have at least one hidden layer (as is provided).

Backpropagation may be implemented as online algorithm.

Experiments must at least show:

•The training and test error

•A comparison of different hidden layer sizes

The entire experiment must be submitted as Matlab script file from which it can be

reproduced. Indicate whether you developed in Matlab or Octave.

Bonus points are given for the implementation of more network layers, an additional

batch-gradient implementation of backpropagation, or meaningful pre-processing

steps.Further bonus points are given for use of a separate validation set, for crossvalidation, or experimental evaluation of any other relevant parameters.

Report structure and assessment (70% of module mark)

1)Write a brief introduction that introduces (10%)

1)Explains what MNIST is about and what its contents are, what relevant size

characteristics are

2)Explain why MNIST is more challenging than the Iris dataset.

3)Briefly discuss key algorithm performances using the listing on the data set

homepage and explain what can be expected for the following experiment.

2)Implement and document a multi-layer perceptron and the backpropagation

training algorithm in Matlab (20%)

1)Build your code up systematically step by step and test. Provide evidence of

that process.

2)5 of the 20 marks in this section are reserved as speed bonus for who can

live-demo a MLP successfully learning XOR (or a similar function) by the 14/11/19.

3)Realize and describe an experiment in Matlab that evaluates the classification

error rate for MLP on the MNIST dataset. Use appropriate illustrations and diagrams

as well as statistics. (20%)

1)Make sure you have one successfully learning parameter set first, and start

to explore systematically from there. Pay particular attention to finding an appropriate

learning rate first.

2)This experiment can be conducted without a full back-propagation

implementation as long as the forward propagation and the learning of the output

layer works, although results will vary from the intended experiment.

4)Bonus points for additional features of MLP or experiment, see above. (10%)

5)Write a brief conclusion on the results and compare to results documented for

other algorithms as well as MLP configurations on the data set homepage. Explain

possible current limitations of your solutions and possible further strategies to

improve on the results (10%)

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