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NVIDIA Generative AI Multimodal Sample Questions:
1. Consider the following Python code snippet used for evaluating a generative model. What potential issue exists with this code, and how would you rectify it to ensure a robust evaluation?
A) The 'inception_score' function is deprecated and should be replaced with a newer metric like FID.
B) The code does not account for the stochastic nature of generative models and needs to be run multiple times with different random seeds to get a stable estimate of the Inception Score.
C) The code is fundamentally correct and does not have any issues.
D) The Inception Score is not an appropriate metric for evaluating generative models, and other methods should be used instead.
E) The number of generated images Cn_generated_imageS) is too small for a reliable Inception Score calculation and should be increased to at least 50,000.
2. You are fine-tuning a pre-trained large language model (LLM) for a specific text generation task using LoRA (Low-Rank Adaptation).
Which of the following statements accurately describes the benefits and limitations of using LoRA?
A) LoRA can improve the accuracy of the fine-tuned model compared to full fine-tuning by preventing overfitting.
B) LoRA is not compatible with model parallelism techniques.
C) LoRA allows for efficient task switching by only storing and loading the small LoRA parameters for different tasks, while keeping the original LLM weights frozen.
D) LoRA reduces the number of trainable parameters by inserting low-rank matrices into the original model layers, making fine-tuning more memory-efficient.
E) A and B.
3. You're designing a U-Net architecture for generating high-resolution medical images from low-resolution scans. Which of the following considerations are MOST crucial for maintaining fine-grained detail during the upsampling process, and how might NVIDIA's NeMo framework assist?
A) Employing a very deep network architecture to capture complex relationships between pixels. NeMo aids in managing the complexity and training of such deep networks with optimized optimizers and distributed training capabilities.
B) Using only bilinear interpolation in the upsampling layers to avoid introducing artifacts. NeMo can assist by providing pre-trained interpolation layers.
C) Ignoring the low resolution features and concentrate on better latent space sampling. NeMo can provide models to enhance sampling techniques.
D) Incorporating skip connections from the contracting path to the expanding path, allowing the network to leverage high-resolution features from earlier layers. NeMo provides modules for efficient skip connection implementation and management of feature map sizes.
E) Using only transpose convolutional layers for upsampling to learn the optimal upsampling filters. NeMo offers optimized transpose convolution implementations for performance.
4. You're building a multimodal model that integrates text, images, and audio. The text data has many missing values. Which of the following strategies would be MOST effective for handling missing text data while leveraging the other modalities?
A) Train a separate model to predict the missing text based on the available image and audio data, then impute the predicted values.
B) Remove all data points with missing text values to ensure data integrity.
C) Use a multimodal generative model (e.g., VAE, GAN) to impute the missing text based on the learned joint representation of all modalities.
D) Use a simple imputation method like replacing missing text with a placeholder like 'unknown'.
E) Ignore the missing text values during training, assuming the model can learn from the available modalities.
5. Which of the following techniques are MOST likely to improve the energy efficiency of a large-scale multimodal AI model without significantly sacrificing accuracy?
A) Using a larger, more complex model architecture.
B) Increasing the batch size during training.
C) Applying pruning techniques to remove less important connections in the model.
D) Knowledge distillation to train a smaller student model.
E) Model quantization (e.g., converting weights from FP32 to INT8).
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: E | Question # 3 Answer: D | Question # 4 Answer: C | Question # 5 Answer: C,D,E |


