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Introduction to Deep Learning and Generative AI · Quiz 2 · 23 Nov 2025 · September 2025 term

Question 11: A student is trying to write the Generator training loop…

Question 11

+2 marksOne correct option

A student is trying to write the Generator training loop and is confused about the order of operations. Their code is:

python
# --- Training the Generator ---


# 1. Generate fakes and get D's output
z = torch.randn(batch_size, latent_size).to(device)


fake_images = G(z)
d_out_fake = D(fake_images)


# 2. Calculate loss
g_loss = criterion(d_out_fake, real_labels)


# 3. Update weights
G_optimizer.step()      # Line 3a
g_loss.backward()       # Line 3b
G.zero_grad()           # Line 3c

This code is completely broken. What is the correct, functional order for lines 3a, 3b, and 3c?

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

Correct answer

  • C

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Question 11 of 25 in the IIT Madras BS Introduction to Deep Learning and Generative AI (Deep Learning and GenAI) Quiz 2 paper sat on 23 Nov 2025, in the September 2025 term (IIT M DIPLOMA AN EXAM QDD2 23 Nov 2025 NEW). It carries 2 marks.

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