Our project mainly builds upon the ns3 network simulator, ns3-ai for ML integration.

About the ns3-defiance repository

We provide a framework for ML and RL research using ns3. You can find our design documentation and user documentation here.

For a practical example of how our framework is used, see this Medium article. The blog is divided into two parts and demonstrates building a balancing inverted pendulum in a network scenario using our framework.

Setup the development environment

Installation with <tt>bake</tt>

See https://github.com/DEFIANCE-project/bake-defiance for easy instructions.

Docker

If you just want a docker container with a built ns3-defiance, head to https://github.com/DEFIANCE-project/bake-defiance and follow the steps to build the full image defiance-full.

For users with a hpi login, you can add --build-arg BASE=registry.gitlab.hpi.de/bp_defiance/bake-defiance:latest-full after you logged in with docker login registry.gitlab.hpi.de instead of building defiance-full manually.

For development, we supply a Dockerfile here, in which you can build your custom changes to ns3-defiance. It builds upon defiance-full, so make sure you have built or downloaded it beforehand. Then, you can build a docker image containing your local changes with a simple docker build .. The ns3 root directory is at $NS3_HOME; the default working directory. By default, ns3 and ns3-defiance are built directly. To skip the build, add --build-arg BUILD_NS3=False.

Installation without <tt>bake</tt>

The manual way:

Requirements: Depending on your use-case, different dependencies are needed. For a complete list of all possible development dependencies, refer to our devcontainer Dockerfile

1. Clone ns3 git clone https://gitlab.com/nsnam/ns-3-dev.git -b ns-3.40
2. Some of our code needs that the environment variable NS3_HOME is set. Set it with export NS3_HOME=/ns-3-dev
3. Clone ns3-ai and ns3-defiance into ns3/contrib: ```shell-c cd ns-3-dev/ git clone https://github.com/DEFIANCE-project/ns3-ai contrib/ai git clone https://github.com/DEFIANCE-project/ns3-defiance contrib/defiance ``
4. Make sure, you have all dependencies. Running./ns3 configure –enable-python –enable-examples –enable-tests` should succeed.
5. Then, compile ns3-ai to generate the message types with protobuf: ./ns3 build ai
6. Install the python requirements with poetry install -C contrib/defiance
7. Manually install the ns3-ai message types: pip install -e ./contrib/ai/python_utils -e ./contrib/ai/model/gym-interface/py
8. Compile everything with ./ns3 build
9. You are now able to start the training of our example scenario, such as defiance-balance2 with run-agent train -n defiance-balance2. See run-agent --help for more info.

Development tools

This repo comes with additional developer tools, which may be installed with poetry install --with dev.

• We format and lint our python code with ruff. Simply run ruff check to lint and ruff format to format.
• We enforce type-checking on our code with mypy. Simply run it!
• Optional jupyter notebook support can be installed with poetry. Simply run poetry install --with ipynb!

In order to test ns3, it needs to be configured correctly. Refer to https://github.com/DEFIANCE-project/bake-defiance for a complete command suggestion.

The ns3 testsuites in the test directory can be run with ./test.py -s <test-suite>, e.g. ./test.py -s defiance-agent-application for the defiance-agent-application testsuite in /test/agent-application-test.cc. For further information refer to https://www.nsnam.org/docs/manual/html/how-to-write-tests.html.

The special ns3-ai tests need to be executed with ./contrib/defiance/tests/run-python-tests.sh

Frequent problems

When you run a ns3 simulation which uses ns3-ai, a segmentation fault occurs. A corresponding python agent is required to run the simulation. For this, you can use the run-agent cli program, i.e. run-agent train for training with ray and run-agent debug for debugging and run-agent random for a random agent. Check out run-agent -h for help.