Intermediate · NLP

Semantic Understanding

Visual diagram · (in preparation) · Math · (in preparation) · Worked example · 3 difficulty levels.

TL;DR. Grasping the meaning of language, not just its surface form.

Technical Definition

Grasping the meaning of language, not just its surface form.

How it works

Surface matching ('cat' = 'cat') is easy; semantic understanding recognizes that 'feline' and 'cat' refer to the same thing, that 'bank' means different things in different sentences, and that sarcasm flips polarity. Embeddings and LLMs have brought this much closer to reality, though true grounded understanding remains debated.

Related Concepts

• Large Language Model (LLM) — A massive neural network trained on vast text corpora to understand and generate human language with remarkable fluency.
• Embedding — A dense vector representation that captures semantic meaning, mapping discrete items like words into continuous mathematical space.
• Reasoning — An AI system's ability to draw logical, multi-step conclusions from given information.