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This page covers clearml-data, ClearML's file-based data management solution. See Hyper-Datasets for ClearML's advanced queryable dataset management solution.

In Machine Learning, you are very likely dealing with a gargantuan amount of data that you need to put in a dataset, which you then need to be able to share, reproduce, and track.

ClearML Data Management solves two important challenges:

  • Accessibility - Making data easily accessible from every machine,
  • Versioning - Linking data and experiments for better traceability.

We believe Data is not code. It should not be stored in a git tree, because progress on datasets is not always linear. Moreover, it can be difficult and inefficient to find on a git tree the commit associated with a certain version of a dataset.

A clearml-data dataset is a collection of files, stored on a central storage location (S3 / GS / Azure / Network Storage). Datasets can be set up to inherit from other datasets, so data lineages can be created, and users can track when and how their data changes.

Dataset changes are stored using differentiable storage, meaning a version will store the change-set from its previous dataset parents.

Local copies of datasets are always cached, so the same data never needs to be downloaded twice. When a dataset is pulled it will automatically pull all parent datasets and merge them into one output folder for you to work with.


clearml-data comes built-in with the clearml python package! Just check out the Getting Started guide for more info!

Using ClearML Data#

ClearML Data offers two interfaces:

  • clearml-data - A CLI utility for creating, uploading, and managing datasets. See CLI for a reference of clearml-data commands.
  • clearml.Dataset - A python interface for creating, retrieving, managing, and using datasets. See SDK for an overview of the basic methods of the Dataset module.

For an overview of our recommendations for ClearML Data workflows and practices, see Best Practices.


ClearML's WebApp provides a visual interface to your datasets through dataset tasks. Dataset tasks are categorized as data-processing task type, and they are labeled with a DATASET system tag.

Full log (calls / CLI) of the dataset creation process can be found in a dataset's EXECUTION section.

Listing of the dataset differential snapshot, summary of files added / modified / removed and details of files in the differential snapshot (location / size / hash), is available in the ARTIFACTS section. Download the dataset by clicking Download, next to the FILE PATH.

The full dataset listing (all files included) is available in the CONFIGURATION section under Dataset Content. This allows you to quickly compare two dataset contents and visually see the difference. The dataset genealogy DAG and change-set summary table is visualized in RESULTS > PLOTS

Dataset Contents

Dataset data WebApp

View a DAG of the dataset dependencies (all previous dataset versions and their parents) in the dataset's page > ARTIFACTS > state.

Data Dependency DAG

Dataset state WebApp

Once a dataset has been finalized, view its genealogy in the dataset's page > RESULTS > PLOTS

Dataset Genealogy

Dataset genealogy and summary