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31005 Advanced Data Analytics - Exploration of the Dataset

The main thing is to choose a project that you’re interested in and passionate about.

Choice 1: Programming ID3

The first option is to program ID3 using the algorithm described in class. You need to develop software to solve a supervised learning problem (ie. to build a model against a training set), then run the software against a test dataset and report the accuracy of the model. Your program should do the following things:

  1. Read a training dataset and a test dataset. The datasets are in the form of text files. See below.
  2. Build a model using the training data as
  3. Print out a representation of the model (ie. the tree orsimilar).
  4. Run the test data against the model, work out the accuracy of the model (ie. How many samples it classified correctly) and print out a confusion matrix to summarise the results.

The ID3 algorithm 

You should build a decision tree using the ID3 algorithm given in the 3rd lecture (it is a pretty simple algorithm, feel free to learn it yourself if you choose to start this assignment before Week 3). This algorithm uses the information gain measure to calculate the splits. You should build the decision tree using the training data supplied, then calculate the error on the supplied test/validation data. Since the mushroom dataset is categorical, you will not need to consider the complexities added with real–valued attributes. There is missing data in the mushroom dataset (flagged by “?” values). Don’t treat the missing data specially. Just pretend that “?” is just another value for the attribute in question. Also, do not worry about pruning the tree.

The program must display a text representation of the decision tree. You are free to display the tree in any way you think makes sense, so long as it shows what attributes are tested at each node in the tree. It is acceptable to utilise diagnosis tools provided by machine learning packages for the display of the tree ** as long as the tree is built by your own program, i.e. it is NOT acceptable to form a 2nd tree using the package, and display the 2nd tree directly **.

Hint #1: The trick with building the decision tree is not really the ID3 algorithm which is fairly straightforward. The tricky bit is managing the dataset. Remember that you need to be able to easily split the dataset based on the value of a specific attribute. That means you need to devise a suitable data structure to easily do this split and to work out class frequencies.

Hint #2: Think carefully about the entropy function you need to use when calculating information gain. It’s not quite so simple as in our theoretical discussion. Specifically, what happens when all of the dataset you’re looking at has only one of the two class values? ie. all the mushrooms are edible or all are poisonous? How will you deal with this?

Hint #3: Follow carefully the online learning materials provided Week 3.

Choice 1-alternative: Programming an algorithm of your choice 

The second option allows you to choose another algorithm to program, so long as you seek approval from me. One potential method is a multilayer perceptron neural network. You may use a supporting mathematical library to help with the details so long as you code the machine learning algorithm part yourself. Note: It is not acceptable to simply write code to call the Java Weka algorithm or the Python scikit-learn code for the algorithm. I expect you to write the main algorithm yourself. The dataset to be used for the classification (or regression) problem will need to be determined in consultation with me, but as a default we would probably use the mushroom dataset from choice 1 if it makes sense.

Choice 2: Doing a data mining project

The third choice is to use an existing package to solve a data mining problem. If you want to do this it will not be enough to just use one classification algorithm and copy the output. You need to explore the data, systematically try several algorithms and parameter settings to find the best (by evaluating the quality of the classifiers) and then provide a recommendation.

This problem has been solved.

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