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How can we assign the weights to output of different models in an ensemble?<br>1. Use an algorithm to return the optimal weights<br>2. Choose the weights using cross validation<br>3. Give high weights to more accurate models
A
1 and 2
B
1 and 3
C
2 and 3
D
all of above
Correct Answer:
all of above
Below are the two ensemble models: 1. E1(M1, M2, M3) and 2. E2(M4, M5, M6) Above, Mx is the individual base models. Which of the following are more likely to choose if following conditions for E1 and E2 are given? E1: Individual Models accuracies are high but models are of the same type or in another term less diverse E2: Individual Models accuracies are high but they are of different types in another term high diverse in nature
A
e1
B
e2
C
any of e1 and e2
D
none of these
Regarding bias and variance, which of the following statements are true? (Here 'high' and 'low' are relative to the ideal model.
i. Models which overfit are more likely to have high bias
ii. Models which overfit are more likely to have low bias
iii. Models which overfit are more likely to have high variance
iv. Models which overfit are more likely to have low variance
A
i and ii
B
ii and iii
C
iii and iv
D
none of these
Regarding bias and variance, which of the following statements are true? (Here 'high' and 'low' are relative to the ideal model. (i) Models which overfit are more likely to have high bias (ii) Models which overfit are more likely to have low bias (iii) Models which overfit are more likely to have high variance (iv) Models which overfit are more likely to have low variance
A
(i) and (ii)
B
(ii) and (iii)
C
(iii) and (iv)
D
none of these
Which of the following can be true for selecting base learners for an ensemble?
1. Different learners can come from same algorithm with different hyper parameters
2. Different learners can come from different algorithms
3. Different learners can come from different training spaces
A
1
B
2
C
1 and 3
D
1, 2 and 3
Which of the following is true about weighted majority votes?
1. We want to give higher weights to better performing models
2. Inferior models can overrule the best model if collective weighted votes for inferior models is higher than best model
3. Voting is special case of weighted voting
A
1 and 3
B
2 and 3
C
1 and 2
D
1, 2 and 3
The sum of the weights of P and Q is more than that of R and S taken together. The weight of P is half as much as the sum of the weights of Q and S. The some of the weights of P and R is the same as the weights of Q and S taken together. Which of the following statements must be incorrect?
A
Q weighs more than S
B
All the above statements are correct
C
Q weighs more than R
D
P weighs more than Q
Suppose you are using stacking with n different machine learning algorithms with k folds on data. Which of the following is true about one level (m base models + 1 stacker) stacking? Note: Here, we are working on binary classification problem All base models are trained on all features You are using k folds for base models
A
you will have only k features after the first stage
B
you will have only m features after the first stage
C
you will have k+m features after the first stage
D
you will have k*n features after the first stage
A man can cross a downstream river by steamer in 40 minutes and same by boat in 1 hour. If the time of crossing Upstream by streamer is 50% more than downstream time by steamer and the time required by boat to cross same river by boat in upstream is 50% more than time required by in downstream. What is the time taken for the man to cross the river downstream by steamer and then return to same place by boat half the way and by steamer the rest of the way?
A
85 minutes
B
115 minutes
C
120 minutes
D
125 minutes
E
None of these
Suppose, you want to apply a stepwise forward selection method for choosing the best models for an ensemble model. Which of the following is the correct order of the steps? Note: You have more than 1000 models predictions.
1. Add the models predictions (or in another term take the average) one by one in the ensemble which improves the metrics in the validation set.
2. Start with empty ensemble
3. Return the ensemble from the nested set of ensembles that has maximum performance on the validation set
A
01-02-03
B
01-03-04
C
02-01-03
D
none of above
Kamal weights twice as much as Momen. Momen's weight is 70% of Babu's weight. Dipu weights 50% of Lipu's weight . Lipu weights 180% of Kamal's weight. Who weights the least ?
A
Babu
B
Dipu
C
Kamal
D
Lipu