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| Section | Objectives |
|---|---|
| Responsible and Trustworthy AI | - Bias and safety considerations - Ethical AI principles |
| Multimodal AI Systems | - Multimodal model design - Cross-modal learning
|
| Core AI and Machine Learning Fundamentals | - Machine learning basics
|
| Generative AI Concepts | - Generative models
|
| NVIDIA AI Ecosystem | - NVIDIA tools and frameworks
|
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NEW QUESTION # 39
You are working with a dataset of handwritten digits and training a Variational Autoencoder (VAE) to generate new digits. After training, you observe that the generated digits are blurry and lack sharp details. Which of the following modifications could potentially improve the quality of the generated digits in your VAE?
Answer: A,C
Explanation:
Increasing the capacity of the encoder and decoder allows the VAE to learn more complex representations of the data. Reducing the weight of the KL divergence term allows the model to prioritize reconstruction accuracy, which can lead to sharper details. Decreasing latent space dimensionality might restrict the model's ability to capture fine-grained details. A simpler decoder will lead to more blurry images. Increasing the KL divergence weight can lead to disentangled representations, but often at the cost of reconstruction quality (blurriness).
NEW QUESTION # 40
In machine learning, what is the purpose of data normalization?
Answer: A
Explanation:
Normalization rescales numeric features onto a common, well-defined range or distribution - for example, min-max scaling to [0,1], or standardization to zero mean and unit variance (z-score) - so that features measured on different scales contribute comparably to model training. Among the options given, "converting data into a specific format for easier analysis" is the closest description of this rescaling purpose, though the more precise technical framing is: normalization standardizes the scale of feature values to stabilize and accelerate optimization.
This matters mechanically because many algorithms are scale-sensitive: gradient descent converges faster and more stably when input features share a comparable range (large-scale features would otherwise dominate the loss gradient), distance-based methods (k-NN, k-means, SVMs with RBF kernels) require comparable scales for distance calculations to be meaningful, and regularization terms penalize weight magnitude uniformly, which only makes sense if inputs are on comparable scales.
It is important to distinguish normalization from the other three options: it does not remove data (A, which is cleansing/filtering), does not increase complexity (B, the opposite of its intent), and does not reduce dimensionality (D, which describes techniques like PCA or feature selection - an entirely separate preprocessing goal focused on the number of features, not their scale).
Reference: Core Machine Learning and AI Knowledge domain - feature scaling (normalization, standardization) vs. dimensionality reduction.
NEW QUESTION # 41
In the context of generative models, what is the primary purpose of using a normalizing flow?
Answer: E
Explanation:
Normalizing flows are used to transform a simple probability distribution into a complex one by applying a series of invertible transformations. This allows the model to learn more complex data distributions and generate more realistic samples.
NEW QUESTION # 42
You're using a diffusion model to generate high-resolution images. You notice that the generated images often contain artifacts and inconsistencies. Which of the following techniques could help improve the image quality?
Answer: C,E
Explanation:
Increasing the number of diffusion steps allows the model to gradually refine the image and reduce artifacts. Classifier-free guidance provides a way to control the generation process and improve image quality by conditioning on a specific class or attribute. Training with a larger batch size may improve training stability but doesn't directly address artifact reduction. A smaller image size will reduce computational cost but doesn't necessarily improve quality at the desired resolution. Decreasing the number of diffusion steps can lead to lower-quality images with more artifacts.
NEW QUESTION # 43
You are working with a multimodal dataset that contains images and corresponding captions. You want to use contrastive learning to learn joint embeddings for images and text. Which of the following loss functions is the most suitable for this task?
Answer: A
Explanation:
Triplet loss is specifically designed for contrastive learning, where the goal is to learn embeddings such that similar pairs are closer in the embedding space than dissimilar pairs- Cross-entropy and binary cross-entropy are classification losses. MSE loss is a regression loss- NLL loss is often used with sequence models but doesn't directly address contrastive learning goals.
NEW QUESTION # 44
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