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- CSE 417A: Homework 1

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Problems:

1. (20 points) LFD Exercise 1.10. Note that you should be able to run a single simulation (flipping 1000 fair coins independently 10 times each, and finding the frequency of heads for

each of them) in one line of Matlab code. For part (a), in addition to answering the question,

also write the single line of Matlab code you used for this. There is no need to submit any

additional code.

2. (20 points) Consider the following experiment on perceptron learning for random training

sets of dimension 10:

• Generate an 11-dimensional weight vector w∗

, where the first dimension is 0 and the

other 10 dimensions are sampled independently at random from the uniform (0, 1) distribution (the first dimension will serve as the threshold, and we’ll just set it to 0 for

convenience).

• Generate a random training set with 100 examples, where each dimension of each training example is sampled independently at random from the uniform (−1, 1) distribution, and the examples are all classified in accordance with w∗

.

• Run the perceptron learning algorithm, starting with the zero weight vector, on the

training set you just generated, and keep track of the number of iterations it takes to

learn a hypothesis that correctly separates the training data.

Write code in Matlab to perform the above experiment and then repeat it 1000 times (note

that you’re generating a new w∗ and a new training set each time). Plot a histogram of the

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number of iterations the algorithm takes to learn a linear separator. How does the number

of iterations compare with the bound on the number of errors we derived in class? Note that

this bound will be different for each instantiation of w∗ and the training set, so you should

either analyze the distribution of bounds across training sets and make a general statement,

or directly analyze the distribution of differences.

There is no need to submit your code for this problem, but we may ask you for it if we have

any questions about your results when grading the homework.

For up to 10 points of extra credit, can you characterize the situations in which the algorithm

takes more iterations to correctly learn a hypothesis that separates the training data? Back up

your answer with evidence from your experiments. Hint: You may want to try and visualize

a lower dimensional version, and/or hold w∗ fixed and vary the training set as you try to

figure this out.

3. (15 points) LFD Problem 1.1

4. (15 points) LFD Problem 1.6

5. (15 points) LFD Problem 1.8

6. (15 points) LFD Problem 1.12

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