[PDF] 10-601 Machine Learning Midterm Exam





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    How Do I Get Started?

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10-601 Machine Learning Midterm Exam

10-601 Machine Learning, Midterm Exam

Instructors: Tom Mitchell, Ziv Bar-Joseph

Monday 22

ndOctober, 2012

There are 5 questions, for a total of 100 points.

This exam has 16 pages, make sure you have all pages before you begin. This exam is open book, open notes, butno computers or other electronic devices.

Good luck!

Name:Andrew ID:

QuestionPointsScore

Short Answers20

Comparison of ML algorithms20

Regression20

Bayes Net20

Overfitting and PAC Learning20

Total:100

1

10-601 Machine Learning Midterm Exam October 18, 2012

Question 1.Short Answers

True False Questions.

(a) [1 point] W ecan get multiple local optimum solutions if we solve a linear r egressionpr oblemby minimizing the sum of squared errors using gradient descent.

True False

Solution:

False(b)[1 point] When a decision tr eeis gr ownto full depth, it is mor elikely to fit the noise in the data.

True False

Solution:

True(c)[1 point] When the hypothesis space is richer ,over fitting is mor elikely .

True False

Solution:

True(d)[1 point] When the featur espace is lar ger,over fitting is mor elikely .

True False

Solution:

True(e)[1 point] W ecan use gradient descent to learn a Gaussian Mixtur eModel.

True False

Solution:

TrueShort Questions.

(f) [3 points] Can you r epresentthe following boolean function with a single logistic thr esholdunit

(i.e., a single unit from a neural network)? If yes, show the weights. If not, explain why not in 1-2

sentences.A B f(A,B) 1 1 0 0 0 0 1 0 1 0 1 0

Page 1 of 16

10-601 Machine Learning Midterm Exam October 18, 2012

Solution:

Yes, you can represent this function with a single logistic threshold unit, since it is linearly separable. Here is one example.

F(A;B) = 1fAB0:5>0g(1)

Page 2 of 16

10-601 Machine Learning Midterm Exam October 18, 2012

(g) [3 points] Suppose we cluster eda set of N data points using two dif ferentclustering algorithms: k-means and Gaussian mixtures. In both cases we obtained 5 clusters and in both cases the centers of the clusters are exactly the same. Can 3 points that are assigned to different clusters in the k- means solution be assigned to the same cluster in the Gaussian mixture solution? If no, explain. If so, sketch an example or explain in 1-2 sentences.

Solution:

Yes, k-means assigns each data point to a unique cluster based on its distance to the cluster center. Gaussian mixture clustering gives soft (probabilistic) assignment to each data point. Therefore, even if cluster centers are identical in both methods, if Gaussian mixture compo- nents have large variances (components are spread around their center), points on the edges

between clusters may be given different assignments in the Gaussian mixture solution.Circle the correct answer(s).

(h) [3 points] As the number of training examples goes to infinity ,your model trained on that data will have: A. Lower variance B. Higher variance C. Same variance

Solution:

Lower variance(i)[3 points] As the number of training examples goes to infinity ,your model trained on that data

will have:

A. Lower bias B. Higher bias C. Same bias

Solution:

Same bias(j)[3 points] Suppose you ar egiven an EM algorithm that finds maximum likelihood estimates for a

model with latent variables. You are asked to modify the algorithm so that it finds MAP estimates instead. Which step or steps do you need to modify: A. Expectation B. Maximization C. No modification necessary D. Both

Solution:

MaximizationPage 3 of 16

10-601 Machine Learning Midterm Exam October 18, 2012

Question 2.Comparison of ML algorithms

Assume we have a set of data from patients who have visited UPMC hospital during the year 2011. A

set of features (e.g., temperature, height) have been also extracted for each patient. Our goal is to decide

whether a new visiting patient has any of diabetes, heart disease, or Alzheimer (a patient can have one

or more of these diseases). (a) [3 points] W ehave decided to use a neural network to solve this pr oblem.W ehave two choices: either to train aseparateneural network for each of the diseases or to train a single neural network with one output neuron for each disease, but with a shared hidden layer. Which method do you prefer? Justify your answer.

Solution:

1- Neural network with a shared hidden layer can capture dependencies between diseases.

It can be shown that in some cases, when there is a dependency between the output nodes, having a shared node in the hidden layer can improve the accuracy.

2- If there is no dependency between diseases (output neurons), then we would prefer to have

a separate neural network for each disease.(b)[3 points] Some patient featur esar eexpensive to collect (e.g., brain scans) wher easothers ar enot

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