NPTEL Natural Language Processing Week 9 Assignment Answers 2025

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NPTEL Natural Language Processing Week 9 Assignment Answers 2025

1. Which of the following is false?

  • Dirchlet distribution is an exponential family distribution
  • LDA is a generative model
  • Dirchlet distribution is taken over the simplex i.e positive vectors that sum to one
  • A higher value of alpha will assign fewer topics to each document whereas a high value of alpha will have the opposite effect.
Answer :- For Answers Click Here

2. In Topic modeling which hyperparameters tuning used to represent document-topic
Density?

  1. Dirichlet hyperparameter Beta
  2. Dirichlet hyperparameter alpha
  3. Number of Topics (K)
  4. None of them
Answer :-

3. You have a topic model with the parameters a = 0.8 and ß = 0.03. Now, if you want to have
sparser distribution over words and denser distribution over topics, what should be the
values for a and ß?

  1. Both a and ß values should be decreased
  2. Both a and ß values should be increased
  3. a should be decreased, but @ should be increased
  4. a should be increased, but ß should be decreased
Answer :-

4. In Gibbs sampling choose the correct option from below

  • It can not directly estimate the posterior distribution over z
  • It is a form of Markov chain Monte Carlo
  • Here sampling is done in parallel
  • Sampling is stopped before sampled values approximate the target distribution
Answer :-

5. Using the above structure the estimated value of B(2)nature at this point is

  • 0.0240
  • 0.02459
  • 0.0260
  • 0.0234
Answer :-

6. Using the above structure the estimated value of 0t1doc

1. 0.6562
2. 0.6162
3. 0.6385
4. 0.50000

Answer :-

7. Using the above structure the estimated value of 0t2doc2

  1. 0.6562
  2. 0.3975
  3. 0.3837
  4. 0.3707
Answer :- For Answers Click Here

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