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7ENT1116 Artificial Intelligence

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7ENT1116 Artificial Intelligence

7ENT1116 Artificial Intelligence

Coursework Assignment 2 – Neural Network Control of a Mobile Robot

 Use the Matlab Deep Learning Toolbox to create and train a neural network that can be used to control a simulated mobile robot so that it will be able to wander about its environment, following a wall on its left side whist avoiding collisions with obstacles. You should aim to make your trained neural network able to match the performance of the given Fuzzy Inference System.

You have been given a working Fuzzy Inference System which performs the same task and can therefore be used to generate training data for the neural network.The trained neural network will be tested using the KiKs simulator in the same test environments as in Coursework Assignment 1.

 Report Requirements

 You must submit a report that describes and evaluates the work you have done to meet all the requirements of this assignment. The report should contain (at least) the following:

 ·  a description of the data that you used to train your neural network, explaining how the data was generated; (20%)

 ·    a full description of your final neural network architecture; (10%)

 ·    a description of the training process, including the training algorithm and the method that you used to avoid overfitting;

     (20%)

 ·   explanations of any problems that you encountered and the design decisions that you made to overcome these problems;     

 (20%)

 a brief discussion of the control performance of the trained network in comparison to the given FIS and the suitability of a neural network for this control application; (20%)

 ·   a printout from the KiKS simulator to show the path travelled by the robot during a successful trial; (5%)

 ·   a listing of the final Matlab code for your control system. (5%).

 The percentages above are intended to give an approximate guide to the weighting that will be given to each component during assessment of the report. Marks will be awarded for:

·        a clear, complete description of the software that you have developed;

·        a logical discussion the design decisions that you made;

·        a well-designed neural network;

·        a well-presented original report.

 

 

 

 Your report should be approximately 2000 words in length and cover about six sides of A4, not including appendices, cover abstract and contents page. Use 11 point Times New Roman font for the main body of text. You may use illustrations and/or diagrams that help you describe your work but any pictorial content must not amount to more than

Overview of the Task

 The file left_wall_follower.fis contains a Fuzzy Inference System (FIS) that can be used as a controller to guide the simulated robot successfully around the test environment. This file and a version of FIS_navigate.m that uses it as a controller can be downloaded from Studynet. This FIS can be used to generate training data for a neural network. Your main task is to design, train and test a neural network that can generate appropriate actuator outputs when being presented with sensor inputs. This trained network can then be used as a controller and demonstrated in the KiKs simulator.

 Questions to Consider in Your Experiments

 During this investigation, you should consider and investigate (at least) the following questions:

·    What is the best way to generate the training data?

·     What type of neural network should you use?

·     How many layers should you use?

·     What transfer functions should you use for each layer?

 

·       Does the training data have to be “normalised” to give input and output values that are in appropriate ranges for the       

       neural  network?

·        How many neurons should you include in each layer (particularly any hidden layers)?

·        What training algorithms should you use?

 ·        Does the network show any signs of overfitting, with the corresponding poor generalisation?

 ·        How well does the trained neural network work as a controller for the robot?

Programming Tips

 ·        All the Matlab code and files that are necessary for a similar task of obstacle avoidance have been provided on StudyNet

        as an example for this coursework. These files are available under the Matlab Code folder.

 ·        The Matlab commands meshgrid and reshape may be useful to generate input patterns for the training set. A simple

         example (meshgrid_demo.m) of the use of these functions is included the navigate_example folder on StudyNet.

 ·        Training data can also be generated by running KiKS simulator with FIS_navigate.m.

 ·        The command evalfis can take a matrix of input values as a parameter and generate many target output values at once.

 ·        You can define, train and test your neural network either by using Matlab commands directly at the command line or by             

       using the graphical interface of nntool.

 ·        You will need to use the Matlab commands load and sim to read the neural network into and to calculate        the running speed and turn rate.

 ·        If you had to “normalise” your training data, don't forget to "un-normalise" the output of your neural network to get the 

       desired turn rate for testing the controller.

 ·        The inputs and outputs of your neural network must be identical to those of the given FIS. Check the given FIS and the

        given FIS_navigate.m file to see what they are and how they are generated.

 ·        Remember to choose the best neural network from a solution pool. 

 

7ENT1116 Module Title: Artificial Intelligence, neural network model,neural network machine learning,neural network algorithm, neural network machine learning, neural networks and deep learning  



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