DefinitionIn forcev1.0.0

Training data

Data used to fit the learnable parameters of an AI system. Narrowly defined, and precisely for that reason decisive for who carries which data governance obligation.

The official source remains authoritative. This is general information about obligations and not legal advice. See this object on the map

Address and citation

This object has an address of its own that is never renamed or reused. Store the identifier in your own file, not the title or the link.

Identifier: praxikon:eu:ai-act:definition:definitie-trainingsdata
Payload hash (sha256): ef859e4087e8a7ceaa231ae837f6477f14ad93fb7a3b9faf98497d7b8313abe9

Citation line

Praxikon, "Training data", praxikon:eu:ai-act:definition:definitie-trainingsdata@1.0.0, dataset praxikon:sys:registry:dataset:ai-act-implementation-graph 2.1.0 (schema 1.4.0), effective_at 2026-08-08T00:00:00.000Z, known_at 2026-08-14T00:00:00.000Z, sha256 ef859e4087e8a7ceaa231ae837f6477f14ad93fb7a3b9faf98497d7b8313abe9

Version: 1.0.0
Legal time (effective_at): 8 August 2026
Knowledge time (known_at): 8 August 2026
Closed on: Not closed
Application date: 1 August 2024
Topics: definitions

Review status: Placed against the official source (8 August 2026). Next check due by 4 February 2027. The check date is the knowledge date of this version; no later recheck has been recorded.

What this object links to

Every relation appears below as a path: from the source with its locator, through the conditions and exceptions of the object carrying the relation, to the consequence. A locator belongs to a statement in the data and not to a relation, so the source is the source anchor of the carrying object.

What this object is about

1 of 1 shown

The object is about this role. Undifferentiated: it does not follow that the duty rests on this role.

Source
Official fact on this object, with its locator.
- EU Artificial Intelligence Act 2024/1689
  Locator: Article 3(29)
  praxikon:eu:ai-act:source:reg-eu-2024-1689
  Open official source
Via
No condition or exception recorded on this object.
Consequence
- ActorProvider of an AI system
  praxikon:eu:ai-act:actor:provider

What this object states

Official fact

Attributable to a named primary source, with a locator. Where they differ, the official source prevails.

Article 3(29) defines training data as data used for training an AI system through fitting its learnable parameters.
- Locator: Article 3(29)praxikon:eu:ai-act:source:reg-eu-2024-1689Open official source

Our interpretation

Our own reading. It can change without the law changing, and it is not the position of a supervisory authority.

The definition is deliberately technical: it covers only data that actually fit the learnable parameters. Data you pass in a prompt or place in a retrieval index are not training data, and that distinction determines whether Article 10 on data governance applies to you. Where it goes wrong: organisations that fine-tune an existing model with their own data assume they remain mere users, while they are fitting learnable parameters and quickly become a downstream provider with documentation obligations of their own. For general-purpose AI models there is additionally the public summary of training content under Article 53, applicable since 2 August 2025 and enforceable since 2 August 2026.
- Locator: Article 3(29)praxikon:eu:ai-act:source:reg-eu-2024-1689Open official source

Recommended step

A practical step we consider appropriate. Not an obligation following from the Regulation.

Record per data set its origin, the basis on which you may use it, the period over which it was collected, which processing steps were applied, and which known limitations or skews it contains. Keep training data administratively separate from validation and testing data, and explicitly log every occasion on which you fine-tune an external model.
- Locator: Article 3(29)praxikon:eu:ai-act:source:reg-eu-2024-1689Open official source

When this applies

No condition recorded on this object.

When this does not apply

No exception recorded on this object.

Referring to this object

Citation block

Copy this reference into your advice, article or file. The identifier, the version and the hash keep the statement findable later, even once the dataset has moved on.

Reference

Praxikon, "Training data",
praxikon:eu:ai-act:definition:definitie-trainingsdata@1.0.0,
dataset praxikon:sys:registry:dataset:ai-act-implementation-graph 2.1.0 (schema 1.4.0),
effective_at 2026-08-08T00:00:00.000Z, known_at 2026-08-08T00:00:00.000Z,
sha256 ef859e4087e8a7ceaa231ae837f6477f14ad93fb7a3b9faf98497d7b8313abe9,
https://www.praxikon.com/en/verkenner/definition/definitie-trainingsdata
(https://www.praxikon.com/api/v1/entities?id=praxikon%3Aeu%3Aai-act%3Adefinition%3Adefinitie-trainingsdata&effective_at=2026-08-08&known_at=2026-08-08&lang=en, accessed 2026-08-25)

Short form

praxikon:eu:ai-act:definition:definitie-trainingsdata@1.0.0 (sha256 ef859e40)

BibTeX

@misc{praxikon-eu-ai-act-definition-definitie-trainingsdata-1-0-0,
  author       = {{Praxikon}},
  title        = {Training data},
  year         = {2026},
  version      = {1.0.0},
  number       = {praxikon:eu:ai-act:definition:definitie-trainingsdata},
  howpublished = {AI Act Change \& Evidence Graph, dataset 2.1.0, schema 1.4.0},
  note         = {effective_at 2026-08-08T00:00:00.000Z; known_at 2026-08-08T00:00:00.000Z; sha256 ef859e4087e8a7ceaa231ae837f6477f14ad93fb7a3b9faf98497d7b8313abe9},
  url          = {https://www.praxikon.com/en/verkenner/definition/definitie-trainingsdata},
  urldate      = {2026-08-25},
  language     = {en}
}

CSL JSON

[
  {
    "id": "praxikon:eu:ai-act:definition:definitie-trainingsdata@1.0.0",
    "type": "dataset",
    "title": "Training data",
    "container-title": "AI Act Change & Evidence Graph",
    "publisher": "Praxikon",
    "version": "1.0.0",
    "number": "praxikon:eu:ai-act:definition:definitie-trainingsdata",
    "URL": "https://www.praxikon.com/en/verkenner/definition/definitie-trainingsdata",
    "language": "en",
    "issued": {
      "date-parts": [
        [
          2026,
          8,
          8
        ]
      ]
    },
    "accessed": {
      "date-parts": [
        [
          2026,
          8,
          25
        ]
      ]
    },
    "note": "dataset praxikon:sys:registry:dataset:ai-act-implementation-graph 2.1.0; schema 1.4.0; effective_at 2026-08-08T00:00:00.000Z; known_at 2026-08-08T00:00:00.000Z; sha256 ef859e4087e8a7ceaa231ae837f6477f14ad93fb7a3b9faf98497d7b8313abe9; retrieved_from https://www.praxikon.com/api/v1/entities?id=praxikon%3Aeu%3Aai-act%3Adefinition%3Adefinitie-trainingsdata&effective_at=2026-08-08&known_at=2026-08-08&lang=en; licence https://www.praxikon.com/nl/legal/terms"
  }
]

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