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Machine Learning Techniques · End Term · 31 Aug 2025 · May 2025 term · Set QDB3

Question 5: Suppose we are solving a binary classification task using…

Question 5

+4 marksOne correct option

Suppose we are solving a binary classification task using a neural network with the following architecture:

  • Input: x=[11]x = \begin{bmatrix} 1 \\ 1 \end{bmatrix}
  • Hidden layer: 2 neurons (ReLU activation)
  • Output layer: 1 neuron (sigmoid activation)

The weight parameters of the network are given as:

W(1)=[w1(1)w2(1)w1(2)w2(2)]=[2−111],W(out)=[w1(out)w2(out)]T=[12]T,W^{(1)} = \begin{bmatrix} w_1^{(1)} & w_2^{(1)} \\ w_1^{(2)} & w_2^{(2)} \end{bmatrix} = \begin{bmatrix} 2 & -1 \\ 1 & 1 \end{bmatrix}, \quad W^{(out)} = \begin{bmatrix} w_1^{(out)} & w_2^{(out)} \end{bmatrix}^T = \begin{bmatrix} 1 & 2 \end{bmatrix}^T,

where wi(j)w_i^{(j)} represents the weight associated with the jj-th neuron for the ii-th input feature. What are the predicted probabilities?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • D

Question 5 of 17 in the IIT Madras BS Machine Learning Techniques (MLT) End Term paper sat on 31 Aug 2025, in the May 2025 term (IIT M DIPLOMA FN EXAM QDD1 31 Aug 2025). It carries 4 marks.

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