06 - Fast ICA

06 - Fast ICA

University

9 Qs

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06 - Fast ICA

06 - Fast ICA

Assessment

Quiz

Science

University

Practice Problem

Easy

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9 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • Ungraded

How long did you take for the last exercise sheet

I didn't do it.

< 5 hours

5-8 hours

< 8 hours

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Scaling independent sources will make them less independent. (T/F)

True.

False.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Infomax: Why would we choose a sigmoid as our transfer function?

To make the data less gaussian

To decorrelate the data

To approximate the cdf of a peaky pdf.

To approximate the cdf of a gaussian.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Kurtosis can be used to measure ...

uniformity.

non-gaussianity.

entropy.

mutual information.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

One disadvantage of kurtosis is ...

division by zero.

it's only applicable to Gaussians.

sensitivity to outliers.

computationally expensive.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is "super-Gaussian"?

Uniform

Laplacian

Poisson

Gaussian with variance > 1.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

FastICA: How do I get multiple sources instead of only one?

Whiten the data.

Repeat FastICA Algorithm for a different b (w).

Through orthogonalisation.

Subtract the first component and repeat.

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

FastICA: The unmixing matrix W sorts the independent components according to ...

variance

index

there's no sorting

lexical

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

FastICA: Which contrast function would you use for a data set with few outliers?

All.

None, give me a fourth.