# CSCI 4100/6100 ASSIGNMENT 7 solution

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CSCI 4100/6100 RPI Machine Learning From Data
ASSIGNMENT 7
LFD is the class textbook
1. (500) Classifying Handwritten Digits: 1 vs. 5
Pick one of the following 3 classiﬁcation algorithms for non-separable data:
(i) Linear Regression for classiﬁcation followed by pocket for improvement. (ii) Linear Programming for classiﬁcation. (iii) Logistic regression for classiﬁcation using gradient descent.
Use your chosen algorithm to ﬁnd the best separator you can using the training data only (use your 2 features from a previous assignment as the inputs). The output is +1 if the example is a 1 and -1 for a 5.
(a) Give separate plots of the training and test data, together with the separators. (b) Compute Ein on your training data and Etest, the test error on the test data. (c) Obtain a bound on the true out-of-sample error. You should get two bounds, one based on Ein and one based on Etest. Use a tolerance δ = 0.05. Which is the better bound? (d) Now repeat using a 3rd order polynomial transform. (e) As your ﬁnal deliverable to a customer, would you use the linear model with or without the 3rd order polynomial transform? Explain.
2. (200) Gradient Descent on a “Simple” Function
Consider the function f(x,y) = x2 + 2y2 + 2sin(2πx)sin(2πy).
(a) Implement gradient descent to minimize this function. Let the initial values be x0 = 0.1;y0 = 0.1, let the learning rate be η = 0.01 and let the number of iterations be 50; Give a plot of the how the function value drops with the number of iterations performed. Repeat this problem for a learning rate of η = 0.1. What happened? (b) Obtain the “minimum” value and the location of the minimum you get for gradient descent using the same η and number of iterations as in part (a), starting from the following initial points: (0.1,0.1),(1,1),(−0.5, −0.5),(−1, −1). A table with the location of the minimum and the minimum values will suﬃce. You should now appreciate why ﬁnding the “true” global minimum of an arbitrary function is a hard problem.
3. (300) Problem 3.16 in LFD
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