Exam NCA-GENL Topic 5 Question 24 Discussion

Actual exam question for NVIDIA's NCA-GENL exam
Question #: 24
Topic #: 5

In the context of transformer-based large language models, how does the use of layer normalization mitigate the challenges associated with training deep neural networks?

A. It reduces the computational complexity by normalizing the input embeddings. B. It stabilizes training by normalizing the inputs to each layer, reducing internal covariate shift. C. It increases the model's capacity by adding additional parameters to each layer. D. It replaces the attention mechanism to improve sequence processing efficiency.

Suggested Answer: B Vote an answer

Layer normalization is a technique used in transformer-based large language models (LLMs) to stabilize and accelerate training by normalizing the inputs to each layer. According to the original transformer paper ("Attention is All You Need," Vaswani et al., 2017) and NVIDIA's NeMo documentation, layer normalization reduces internal covariate shift by ensuring that the mean andvariance of activations remain consistent across layers, mitigating issues like vanishing or exploding gradients in deep networks. This is particularly crucial in transformers, which have many layers and process long sequences, making them prone to training instability. By normalizing the activations (typically after the attention and feed-forward sub- layers), layer normalization improves gradient flow and convergence. Option A is incorrect, as layer normalization does not reduce computational complexity but adds a small overhead. Option C is false, as it does not add significant parameters. Option D is wrong, as layer normalization complements, not replaces, the attention mechanism.
References:
Vaswani, A., et al. (2017). "Attention is All You Need."
NVIDIA NeMo Documentation: https://docs.nvidia.com/deeplearning/nemo/user-guide/docs/en/stable/nlp
/intro.html

by Nathan at Jun 04, 2025, 04:34 PM

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