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NVIDIA Generative AI Multimodal Sample Questions (Q279-Q284):
NEW QUESTION # 279
You are working on a sequence-to-sequence model for neural machine translation. You've implemented an attention mechanism, but the model is still struggling with long sentences, often losing context in the later parts of the translation. Which type of attention mechanism is most likely to alleviate this issue effectively?
Answer: E
Explanation:
Multi-Head Attention allows the model to attend to different parts of the input sequence with different learned linear projections, capturing richer relationships and improving performance on long sequences compared to single-head attention mechanisms- While other attention mechanisms are valuable, multi- head attention offers the most robust solution for long-range dependencies.
NEW QUESTION # 280
You have trained a multimodal model to generate descriptions for recipes, using images of the finished dish as one modality and a list of ingredients as another. When evaluating the generated descriptions, you notice the descriptions are factually correct in terms of ingredients but often fail to capture the stylistic nuances or tone of professionally written recipes. Which evaluation strategy would provide the most insightful feedback on this aspect of the model's performance?
Answer: B
Explanation:
Human evaluation is the most reliable way to assess subjective aspects of the generated text, such as stylistic appropriateness. While automated metrics like BLEU, ROUGE, and perplexity can provide insights into factual accuracy and fluency, they do not capture the nuances of style and tone as effectively as human judgment. Therefore, the correct answer is (D).
NEW QUESTION # 281
Which of the following techniques are commonly used to address the 'hallucination' problem in generative A1 models, where the model generates content that is factually incorrect or nonsensical? (Select all that apply)
Answer: B,C,D
Explanation:
RLHF helps align the model with human values, reducing nonsensical outputs. RAG grounds the generation process in external knowledge, ensuring factual accuracy. Lowering the temperature reduces the likelihood of sampling low-probability, potentially hallucinated, tokens. Increasing model Size or using adversarial training can improve model performance, but doesn't directly address hallucination.
NEW QUESTION # 282
You are working on a project to classify images of different types of flowers. You have a relatively small dataset (around 500 images per class). Which of the following techniques would be the MOST effective to improve the performance of your image classifier, considering the limited data?
Answer: B
Explanation:
Transfer learning, specifically fine-tuning a pre-trained model, is highly effective when dealing with small datasets. Pre-trained models have already learned useful features from large datasets, and fine-tuning them allows the model to adapt to the specific characteristics of your flower dataset. Training a deep network from scratch with limited data will likely lead to overfitting. Data augmentation helps, but transfer learning is generally more impactful. Reducing image resolution might lose important details, and a linear classifier might be too simple to capture the complexity of image features.
NEW QUESTION # 283
You are tasked with visualizing the performance of a Generative A1 model across different categories of input dat a. You need to show both the accuracy and the number of data points in each category. Which visualization technique would be MOST effective for this purpose?
Answer: B
Explanation:
A combination chart effectively displays two different types of data (accuracy and sample size) for each category. It allows for easy comparison and identification of trends. A pie chart is not suitable for showing multiple data points. Error bars don't effectively represent sample size in a standard bar chart. A scatter plot is more appropriate for showing the relationship between two continuous variables. A table lacks the visual impact of a chart.
NEW QUESTION # 284
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