Beginner · Data

Dataset

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

TL;DR. An organized collection of examples used to train, validate, or test a model.

Technical Definition

An organized collection of examples used to train, validate, or test a model.

How it works

Datasets can be tabular, text, image, audio, video, or multimodal. Quality, size, diversity, and label accuracy directly determine model quality. Famous datasets — MNIST, ImageNet, Common Crawl, LAION — have shaped entire research subfields.

Related Concepts

• Training Data — The portion of a dataset used to fit a model's parameters.
• Validation Data — A held-out subset used to tune hyperparameters and detect overfitting during training.
• Test Data — A separate, untouched dataset used only at the end to estimate real-world performance.