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Tagged: Machine Learning, NPTEL, Practical Machine Learning with Tensorflow, Tensorflow, Unit 2  Week 1
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May 4, 2020 at 8:00 am #403Abhishek TyagiKeymaster
1) From the below graphs, select the one that satisfies the equation y=σ(0.1∗x) :
Answer
2) Perform zscore normalization and minmax scaling on the given array and select from the given options.
arr = [ 100 , 50 , 400 , 300 , 100 ]
Answer None of the above
3) We have a neural network with an input layer of h0 nodes, hidden layers of h1, h2, h3…., h1 nodes respectively and an output layer of h(l+1) nodes. How many parameters does the network have?
Answer
\sum \limits_{i=0}^l [(h_i*h_{i+1})+h_{i+1}]
4) Suppose we need to minimize the following loss function by tuning scalar value w using gradient descent: f(w) = 9 + 4w + w2 . Given w<sub>0</sub> =0, select the best value for learning rate α, such that gradient descent reaches the optimal value in just one step.
Answer 0.5
5) In linear regression with MAE loss, if we only had one target Y_train for all the observations X_train, then the optimal value that the prediction Y_pred should have is:
Answer
Median of Y_train
6) A machine learning model gets an accuracy of 90% on a dataset with 90% positive class and 10% negative class. Can we conclude that the model is a good classifier of the data?
Answer No
7) Suppose you are given with the following training data for linear regression
x = [3, 2, 4, 0] y = [4, 1, 3, 1] You are using a loss function J(w, b) = \frac{1}{2} \sum \limits_{i=1}^n [h(x_i)  y_i ] ^2 What is the value of J(1,1)?
Answer 4
8) In the above question, if
(w, b) = (1, 3), what is <i> h(4)</i>
?Answer 7
9) If we halve the value of a given feature, what happens to the coefficients of other features estimated by minimizing squared loss function? (assuming no interaction between any two features)
Answer Stay the same
10) Which of the following model complexity vs. loss function plots is most likely from training data?
Answer
 This topic was modified 1 year, 1 month ago by Abhishek Tyagi.
 This topic was modified 1 year, 1 month ago by roboticswithpython@gmail.com.
 This topic was modified 1 year, 1 month ago by roboticswithpython@gmail.com.
 This topic was modified 1 year, 1 month ago by roboticswithpython@gmail.com.
 This topic was modified 12 months ago by Abhishek Tyagi.


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