Getting started

Overview

Label Studio is a self-contained Web application for multi-typed data labeling and exploration. The backend is written in pure Python powered by Flask. The frontend part is a backend-agnostic React + MST app, included as a precompiled script.

Here are the main concepts behind Label Studio’s workflow:

• Tasks represent an individual dataset items. Label Studio is a multi-type labeling tool - you can import either text, image, audio URL, HTML text or any number and combination of these data resources.
• Completions are the labeling results in JSON format. They could be exported in various common formats, ready to use in machine learning pipelines.
• Predictions are the optional labeling results in the same format, but unlike completions they are used for generating pre-labeling during the annotation process, or validating the model predictions.
• Machine learning backend connects popular machine learning frameworks to Label Studio for active learning & generating model predictions on-the-fly.
• Labeling config is a simple XML tree with tags used to configure UI elements, connect input data to output labeling scheme.
• Project encompasses tasks, config, predictions and completions all-in-one in an isolated directory
• Frontend Labeling UI is accessible from any browser, distributed as precompiled js/css scripts and could be easily extendable with new labeling tags. You can also embed Label Studio UI into your applications.

Quickstart

Prerequisites

Label Studio is supported for Python 3.5 or greater, running on Linux, Windows and MacOSX.

Note: for Windows users the default installation may fail to build lxml package. Consider manually installing it from unofficial Windows binaries e.g. if you are running on x64 with Python 3.8, run pip install lxml‑4.5.0‑cp38‑cp38‑win_amd64.whl.

Running with pip

To install Label Studio via pip, you need Python>=3.5 and run:

pip install label-studio

Then launch a new project which stores all labeling data in a local directory my_labeling_project:

label-studio start my_labeling_project --init

The default browser opens automatically at http://localhost:8200.

Running with Docker

Label Studio is also distributed as a docker container. Make sure you have Docker installed on your local machine.

Install and start Label Studio at http://localhost:8200 storing all labeling data in ./my_labeling_project directory:

docker run --rm -p 8200:8200 -v `pwd`/my_labeling_project:/label-studio/my_labeling_project --name label-studio heartexlabs/label-studio:latest

Note: if ./my_labeling_project the folder exists, an exception will be thrown. Please delete this folder or use --force option.
Note: for Windows, you have to modify the volumes paths set by -v option

You can override the default startup command by appending any of available command line arguments:

docker run -p 8200:8200 -v `pwd`/my_project:/label-studio/my_project --name label-studio heartexlabs/label-studio:latest label-studio start my_project --init --force --template image_mixedlabel

If you want to build a local image, run:

docker build -t heartexlabs/label-studio:latest .

Running from source

If you want to use nighty builds, or extend the functionality, consider to download the source code using Git and run Label Studio locally:

git clone https://github.com/heartexlabs/label-studio.git
cd label-studio
python setup.py develop

Then create a new project, it stores all labeling data in a local directory my_labeling_project:

label-studio start my_labeling_project --init

The default browser will open automatically at http://localhost:8200.

Multisession mode

You can start Label Studio in multisession mode - each browser session creates it’s own project with associated session ID as a name.

In order to launch Label Studio in multisession mode and keep all projects in a separate directory session_projects, run

label-studio start-multi-session --root-dir ./session_projects

Command line arguments

You can specify input tasks, project config, machine learning backend and other options via the command line interface. Run label-studio start --help to see all available options.