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AI & Machine Learning · Foundational

Large Language Model (LLM)

A very large transformer model trained on massive text data to understand and generate natural language and code.

Definition

LLMs, with billions of parameters, are pretrained with self-supervision and then refined with instruction tuning and preference optimization. They perform many tasks through prompting alone, including drafting, summarization, coding, reasoning and tool use. Limitations include hallucination, knowledge cutoffs and context-length limits.

Exam tip

LLMs generate plausible text, not guaranteed facts; grounding with RAG reduces hallucination.

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