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NEW QUESTION # 337
You're working on a multimodal AI system that combines text and image dat a. You're using a contrastive learning approach to learn joint embeddings of text and images. However, you notice that the system performs well on seen image-text pairs but poorly on unseen combinations. What technique MOST directly addresses this generalization problem?
Answer: D
Explanation:
Hard negative mining focuses on selecting the most challenging negative examples (incorrect image-text pairs) during training. This forces the model to learn more robust and discriminative embeddings that generalize better to unseen combinations. Increasing embedding dimension or using larger batch size might help to some extent, but hard negative mining directly addresses the core issue of distinguishing similar but incorrect pairs. Decreasing the temperature parameter can make the contrastive loss too sensitive, potentially hindering generalization. A simpler model architecture may be detrimental if it lacks the capacity to capture the complex relationships
NEW QUESTION # 338
Which of the following loss functions is MOST suitable for training a multimodal model for cross-modal retrieval, where the goal is to retrieve relevant images given a text query and vice versa?
Answer: D
Explanation:
Triplet loss is specifically designed for learning embeddings where similar items are close together and dissimilar items are far apart. In cross-modal retrieval, you want the embeddings of a text query and its relevant images to be close, while the embeddings of the query and irrelevant images are far apart. Cross-entropy and binary cross-entropy are for classification. MSE is for regression. KL Divergence measures the difference between probability distributions, less suitable here.
NEW QUESTION # 339
You are developing a multimodal model that takes both images and text as input. You want to fuse these modalities at an early stage.
Which of the following techniques is MOST appropriate for early fusion?
Answer: B
Explanation:
Cross-attention mechanisms at early layers allow the model to learn interactions between image and text features from the beginning, enabling a more nuanced understanding of their relationships. Concatenating feature vectors is a form of early fusion (A), but cross- attention is more powerful. Averaging predictions (B) is a late fusion technique. Concatenating raw pixels and tokens (E) is unlikely to work well due to the different nature of the data. Weighted sum (D) represents late fusion.
NEW QUESTION # 340
You are fine-tuning a pre-trained multimodal model for a new task. You have limited computational resources. Which of the following fine-tuning strategies would be the MOST computationally efficient while still achieving good performance?
Answer: E
Explanation:
Freezing the lower layers and fine-tuning the upper layers and classification head strikes a balance between computational efficiency and performance. The lower layers typically capture more general features that are less specific to the task, while the upper layers capture more task-specific features. Freezing the lower layers reduces the number of trainable parameters, making the fine-tuning process more computationally efficient. Fine-tuning all layers is computationally expensive, freezing all layers except the classification head might not be sufficient for adapting to the new task, and training from scratch does not leverage the knowledge learned during pre-training. Randomizing model is not a general practice.
NEW QUESTION # 341
You are deploying a text-to-speech application using NVIDIA Riv
a. The application needs to handle a large volume of concurrent requests with minimal latency. Which of the following Riva deployment configurations would be MOST appropriate?
Answer: B
Explanation:
For high-throughput, low-latency applications, deploying Riva across multiple GPUs using Triton Inference Server is optimal. Triton enables dynamic batching, which groups incoming requests to maximize GPU utilization, and allows for scaling across multiple GPUs to handle increased load. Riva leverages gRPC to communicate with Triton.
NEW QUESTION # 342
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