doccano/backend/README.md

<div align="center">
  <img src="https://raw.githubusercontent.com/doccano/doccano/master/docs/images/logo/doccano.png">
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# doccano

doccano is an open source text annotation tool for humans. It provides annotation features for text classification, sequence labeling and sequence to sequence tasks. So, you can create labeled data for sentiment analysis, named entity recognition, text summarization and so on. Just create a project, upload data and start annotating. You can build a dataset in hours.

## Demo

You can try the [annotation demo](http://doccano.herokuapp.com).

![Demo image](https://raw.githubusercontent.com/doccano/doccano/master/docs/images/demo/demo.gif)

## Features

- Collaborative annotation
- Multi-language support
- Mobile support
- Emoji :smile: support
- Dark theme
- RESTful API

## Installation

To install doccano, simply run:

```bash
pip install doccano
```

By default, SQLite 3 is used for the default database. If you want to use PostgreSQL, install the additional dependencies:

```bash
pip install 'doccano[postgresql]'
```
and set `DATABASE_URL` environment variable according to your PostgreSQL credentials:
```bash
DATABASE_URL="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}:${POSTGRES_PORT}/${POSTGRES_DB}?sslmode=disable"
```

After installation, run the following commands:

```bash
# Initialize database.
doccano init
# Create a super user.
doccano createuser --username admin --password pass
# Start a web server.
doccano webserver --port 8000
```

In another terminal, run the following command:

```bash
# Start the task queue to handle file upload/download.
doccano task
```

Go to <http://127.0.0.1:8000/>.

## FAQ

- [How to create a user](https://doccano.github.io/doccano/faq/#how-to-create-a-user)
- [How to add a user to your project](https://doccano.github.io/doccano/faq/#how-to-add-a-user-to-your-project)
- [How to change the password](https://doccano.github.io/doccano/faq/#how-to-change-the-password)

See the [documentation](https://doccano.github.io/doccano/) for details.

## Contribution

As with any software, doccano is under continuous development. If you have requests for features, please file an issue describing your request. Also, if you want to see work towards a specific feature, feel free to contribute by working towards it. The standard procedure is to fork the repository, add a feature, fix a bug, then file a pull request that your changes are to be merged into the main repository and included in the next release.

Here are some tips might be helpful. [How to Contribute to Doccano Project](https://github.com/doccano/doccano/wiki/How-to-Contribute-to-Doccano-Project)

## Citation

```tex
@misc{doccano,
  title={{doccano}: Text Annotation Tool for Human},
  url={https://github.com/doccano/doccano},
  note={Software available from https://github.com/doccano/doccano},
  author={
    Hiroki Nakayama and
    Takahiro Kubo and
    Junya Kamura and
    Yasufumi Taniguchi and
    Xu Liang},
  year={2018},
}
```

## Contact

For help and feedback, please feel free to contact [the author](https://github.com/Hironsan).