BioCypher project template

A quick way to set up a BioCypher-driven knowledge graph pipeline.

Using the GitHub Template functionality

You can use this template in GitHub directly. Just select biocypher/project-template as your template when creating a new repository on GitHub.

⚙️ Installation (local, for docker see below)

1. Clone this repository and rename to your project name. {bash} git clone https://github.com/biocypher/project-template.git mv project-template my-project cd my-project
2. Make the repository your own. {bash} rm -rf .git git init git add . git commit -m "Initial commit" # (you can add your remote repository here)
3. Install the dependencies using Poetry. (Or feel free to use your own dependency management system. We provide a pyproject.toml to define dependencies.) {bash} poetry install
4. You are ready to go! {bash} poetry shell python create_knowledge_graph.py

🛠 Usage

Structure

The project template is structured as follows: . │ # Project setup │ ├── LICENSE ├── README.md ├── pyproject.toml │ │ # Docker setup │ ├── Dockerfile ├── docker │   ├── biocypher_entrypoint_patch.sh │   ├── create_table.sh │   └── import.sh ├── docker-compose.yml ├── docker-variables.env │ │ # Project pipeline │ ├── create_knowledge_graph.py ├── config │   ├── biocypher_config.yaml │   ├── biocypher_docker_config.yaml │   └── schema_config.yaml └── template_package └── adapters └── example_adapter.py

The main components of the BioCypher pipeline are the create_knowledge_graph.py, the configuration in the config directory, and the adapter module in the template_package directory. The latter can be used to publish your own adapters (see below). You can also use other adapters from anywhere on GitHub, PyPI, or your local machine.

The BioCypher ecosystem relies on the collection of adapters (planned, in development, or already available) to inform the community about the available data sources and to facilitate the creation of knowledge graphs. If you think your adapter could be useful for others, please create an issue for it on the main BioCypher repository.

In addition, the docker setup is provided to run the pipeline (from the same python script) in a docker container, and subsequently load the knowledge graph into a Neo4j instance (also from a docker container). This is useful if you want to run the pipeline on a server, or if you want to run it in a reproducible environment.

Running the pipeline

python create_knowledge_graph.py will create a knowledge graph from the example data included in this repository (borrowed from the BioCypher tutorial). To do that, it uses the following components:

• create_knowledge_graph.py: the main script that orchestrates the pipeline. It brings together the BioCypher package with the data sources. To build a knowledge graph, you need at least one adapter (see below). For common resources, there may already be an adapter available in the BioCypher package or in a separate repository. You can also write your own adapter, should none be available for your data.

• example_adapter.py (in template_package.adapters): a module that defines the adapter to the data source. In this case, it is a random generator script. If you want to create your own adapters, we recommend to use the example adapter as a blueprint and create one python file per data source, approproately named. You can then import the adapter in create_knowledge_graph.py and add it to the pipeline. This way, you ensure that others can easily install and use your adapters.

• schema_config.yaml: a configuration file (found in the config directory) that defines the schema of the knowledge graph. It is used by BioCypher to map the data source to the knowledge representation on the basis of ontology (see this part of the BioCypher tutorial).

• biocypher_config.yaml: a configuration file (found in the config directory) that defines some BioCypher parameters, such as the mode, the separators used, and other options. More on its use can be found in the Documentation.

Publishing your own adapters

After adding your adapter(s) to the adapters directory, you may want to publish them for easier reuse. To create a package to distribute your own adapter(s), we recommend using Poetry. Poetry, after setup, allows you to publish your package to PyPI using few simple commands. To set up your package, rename the template_package directory to your desired package name and update the pyproject.toml file accordingly. Most importantly, update the name,author, and version fields. You can also add a description and a license. Then, you can publish your package to PyPI using the following commands:

{bash} poetry build poetry publish

If you don't want to publish your package to PyPI, you can also install it from GitHub using the respective functions of poetry or pip.

🐳 Docker

This repo also contains a docker compose workflow to create the example database using BioCypher and load it into a dockerised Neo4j instance automatically. To run it, simply execute docker compose up -d in the root directory of the project. This will start up a single (detached) docker container with a Neo4j instance that contains the knowledge graph built by BioCypher as the DB neo4j (the default DB), which you can connect to and browse at localhost:7474. Authentication is deactivated by default and can be modified in the docker_variables.env file (in which case you need to provide the .env file to the deploy stage of the docker-compose.yml).

Regarding the BioCypher build procedure, the biocypher_docker_config.yaml file is used instead of the biocypher_config.yaml (configured in scripts/build.sh). Everything else is the same as in the local setup. The first container (build) installs and runs the BioCypher pipeline, the second container (import) installs Neo4j and runs the import, and the third container (deploy) deploys the Neo4j instance on localhost. The files are shared using a Docker Volume. This three-stage setup strictly is not necessary for the mounting of a read-write instance of Neo4j, but is required if the purpose is to provide a read-only instance (e.g. for a web app) that is updated regularly; for an example, see the meta graph repository. The read-only setting is configured in the docker-compose.yml file (NEO4J_dbms_databases_default__to__read__only: "false") and is deactivated by default.