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NLP Academy · Lesson

Why LLMs Need Retrieval

Beating hallucination with real sources.

A Model With a Frozen Memory

An LLM only knows what it saw during training. After that cutoff its knowledge is frozen, so it cannot see your latest docs or private data.

The Hallucination Problem

When an LLM lacks a fact, it often invents a confident-sounding one. We call this a hallucination, and it is the core risk to trust.

All lessons in this course

  1. Why LLMs Need Retrieval
  2. Chunking and Embedding Documents
  3. Vector Search With a Vector Store
  4. Wiring Retrieval Into the Prompt
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