Residual Vector Quantization Quiz

Answers and explanations appear as you take the quiz.

1. What does each successive codebook in RVQ quantize?
   • The residual error left by the previous stages
   • The original input again from scratch
   • A different audio channel
   • The output of the decoder
2. Why use RVQ instead of a single large codebook?
   • It avoids the need for any training
   • It factorizes a huge effective codebook into small ones, saving memory and compute
   • It eliminates the encoder entirely
   • It only works for text data
3. How is the final reconstruction formed from the RVQ codes?
   • By taking only the last codebook's vector
   • By averaging the input with noise
   • By summing the selected vectors from all stages
   • By multiplying all codebook entries
4. With M stages of K entries each, how many effective code combinations does RVQ represent?
   • M times K
   • M plus K
   • K divided by M
   • K to the power M
5. What is the typical purpose of the 'commitment loss' when training RVQ codebooks?
   • To keep encoder outputs close to their chosen codebook entries
   • To increase the audio sample rate
   • To delete unused audio frames
   • To convert codes back into text
6. How does RVQ let a neural codec change its bitrate at inference time?
   • By switching to a different sample rate only
   • By using more or fewer quantizer stages
   • By retraining the whole model each time
   • By compressing the decoder weights
7. In RVQ training, what does commitment loss encourage?
   • Each codebook to contain a different number of entries
   • The decoder to output longer audio
   • The encoder output to stay close to the selected codebook vector
   • The residual to increase at every quantization stage
8. How are codebook vectors commonly updated in the guide’s RVQ description?
   • By sorting the codebook alphabetically
   • By replacing the codebook with a recurrent network
   • By adding the residual directly to every code index
   • With exponential moving averages of encoder assignments