Glossary Library

Technical GlossaryGenerative AI and LLM

Factuality

A quality dimension describing how well generated content aligns with real-world facts, source data, or verifiable truth.

Factuality emphasizes that it is not enough for text to be fluent; it must also be correct. Generative models can produce factual errors especially in summarization, question answering, and information synthesis. For this reason, factuality assessment has become an integral part of modern LLM quality evaluation.

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Generative AI

A class of AI systems capable of generating new content such as text, images, audio, video, or code.

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Perplexity

A measure, especially common in language models, that summarizes how surprised a probability model is by the data.

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Train / Validation / Test Split

A core data splitting approach used to separate model learning, tuning, and final evaluation in an honest way.