Reference Figure 1.

Typically early in training, the value of D(G(z)) is closer to which of the following values?

Question

Reference Figure 1.

Typically early in training, the value of D(G(z)) is closer to which of the following values?

BlackTom AI · Accepted Answer

Question: Reference Figure 1. Typically early in training, the value of D(G(z)) is closer to which of the following values?

Option 1: Close to 1
- Interpretation: This would mean the discriminator (D) confidently thinks the generator’s output G(z) is real. In the early stages of GAN training, the generator is typically not yet producing realistic samples, so the discriminator easily identifies fake outputs as not real. Therefore this option is unlikely.

Option 2: Close to 0
- Interpretation: D(G(z)) represents the discriminator’s estimate that G(z) is real. If the generator is weak early on, D should correctly label its outputs as fake, pushing D(G(z)) toward 0. This aligns with the standard dynamic where the generator has not yet learned to fool the discriminator.

Option 3: Close to 0.5
- Interpretation: A value near 0.5 suggests the discriminator is uncertain or guessing randomly, offering no real signal about real vs fake. Early in training, the discriminator usually has a strong signal distinguishing fake from real, so 0.5 would not be typical.

Summary of reasoning: At the start of training, the generator produces poor approximations of real data, so the discriminator easily identifies these as fake. Consequently, D(G(z)) tends toward 0, reflecting low probability that G(z) is real. The other values would imply either the discriminator is almost always fooled (close to 1) or that it is guessing randomly (close to 0.5), neither of which matches the typical early-stage behavior of GAN training.

CS-7643-O01, OAN, OSZ Quiz #5: Module 4

Reference Figure 1. Typically early in training, the value of D(G(z)) is closer to which of the following values?

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