Free Oracle 1z0-1127-25 Practice Exam with Questions & Answers

Comprehensive and Detailed In-Depth Explanation:

LangChain is a Python library designed to simplify building applications with LLMs by providing tools for chaining operations, managing memory, and integrating external data (e.g., via RAG). This makes Option B correct. Options A, C, and D are incorrect, as LangChain is neither JavaScript, Java, nor Ruby-based, nor limited to summarization or generation alone—it’s broader in scope. It’s widely used for LLM-powered apps.

OCI 2025 Generative AI documentation likely introduces LangChain under supported frameworks.

Comprehensive and Detailed In-Depth Explanation:

OCI Generative AI typically offers pretrained models for summarization (A), generation (B), and embeddings (D), aligning with common generative tasks. Translation models (C) are less emphasized in generative AI services, often handled by specialized NLP platforms, making C the NOT category. While possible, translation isn’t a core OCI generative focus based on standard offerings.

OCI 2025 Generative AI documentation likely lists model categories under pretrained options.

Comprehensive and Detailed In-Depth Explanation:

Prompt 1: Shows intermediate steps (3 × 4 = 12, then 12 ÷ 4 = 3 sets, $200 ÷ $50 = 4)—Chain-of-Thought.

Prompt 2: Steps back to a simpler problem before the full one—Step-Back.

OCI 2025 Generative AI documentation likely defines these under prompting strategies.

Comprehensive and Detailed In-Depth Explanation:

Indexing in vector databases maps high-dimensional vectors to a data structure (e.g., HNSW,Annoy) to enable fast, efficient similarity searches, critical for real-time retrieval in LLMs. This makes Option B correct. Option A is backwards—indexing organizes, not de-indexes. Option C (compression) is a side benefit, not the primary role. Option D (categorization) isn’t indexing’s purpose—it’s about search efficiency. Indexing powers scalable vector queries.

OCI 2025 Generative AI documentation likely explains indexing under vector database operations.

Comprehensive and Detailed In-Depth Explanation:

Chain-of-Thought (CoT) prompting encourages an LLM to emit intermediate reasoning steps before providing a final answer, improving performance on complex tasks by mimicking human reasoning. This matches the scenario, making Option D correct. Option A (In-context Learning) involves learning from examples in the prompt, not necessarily reasoning steps. Option B (Step-Back Prompting) involves reframing the problem, not emitting steps. Option C (Least-to-Most Prompting) breaks tasks into subtasks but doesn’t focus on intermediate reasoning explicitly. CoT is widely recognized for reasoning tasks.

OCI 2025 Generative AI documentation likely covers Chain-of-Thought under advanced prompting techniques.

Comprehensive and Detailed In-Depth Explanation:

Greedy decoding selects the word with the highest probability at each step, aiming for locally optimal choices without considering future tokens. This makes Option C correct. Option A (random selection) describes sampling, not greedy decoding. Option B (position-based) isn’t how greedy decoding works—it’s probability-driven. Option D (weighted random) aligns with top-k or top-p sampling, not greedy. Greedy decoding is fast but can lack diversity.

OCI 2025 Generative AI documentation likely explains greedy decoding under decoding strategies.

Comprehensive and Detailed In-Depth Explanation:

Embeddings in LLMs are high-dimensional vectors that encode the semantic meaning of words, phrases, or sentences, capturing relationships like similarity or context (e.g., "cat" and "kitten" being close in vector space). This allows the model to process and understand text numerically, making Option C correct. Option A is irrelevant, as embeddings don’t deal with visual attributes. Option B is incorrect, as frequency is a statistical measure, not the purpose of embeddings. Option D is partially related but too narrow—embeddings capture semantics beyond just grammar.

OCI 2025 Generative AI documentation likely discusses embeddings under data representation or vectorization topics.

Comprehensive and Detailed In-Depth Explanation:

LLMs without Retrieval Augmented Generation (RAG) depend solely on the knowledge encoded in their parameters during pretraining on a large, general text corpus. They generate responses basedon this internal knowledge without accessing external data at inference time, making Option B correct. Option A is false, as external databases are a feature of RAG, not standalone LLMs. Option C is incorrect, as LLMs can generate responses without fine-tuning via prompting or in-context learning. Option D is wrong, as vector databases are used in RAG or similar systems, not in basic LLMs. This reliance on pretraining distinguishes non-RAG LLMs from those augmented with real-time retrieval.

OCI 2025 Generative AI documentation likely contrasts RAG and non-RAG LLMs under model architecture or response generation sections.

Comprehensive and Detailed In-Depth Explanation:

T-Few fine-tuning, a Parameter-Efficient Fine-Tuning (PEFT) method, updates only a small fraction of an LLM’s weights, reducing computational cost and overfitting risk compared to Vanilla fine-tuning (all weights). This makes Option C correct. Option A describes Vanilla fine-tuning. Option B is false—T-Few updates weights, not architecture. Option D is incorrect—T-Few typically reduces training time. T-Few optimizes efficiency.

OCI 2025 Generative AI documentation likely highlights T-Few under fine-tuning options.

Comprehensive and Detailed In-Depth Explanation:

In NLP (e.g., transformers), encoders convert input text into a vector representation (encoding meaning), while decoders generate text from such vectors (e.g., in translation or generation). This makes Option C correct. Option A is false—decoders generate text. Option B reverses roles—encoders don’t predict next words, and decoders don’t encode. Option D oversimplifies—encoders handle text, not just numbers. This is the foundation of seq2seq models.

OCI 2025 Generative AI documentation likely explains encoder-decoder roles under model architecture.