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Starter Kit for Flatland Challenge on AIcrowd
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Flatland Challenge Starter Kit


Instructions to make submissions to the SBB CFF Flatland Challenge.

Participants will have to submit their code, with packaging specifications, and the evaluator will automatically build a docker image and execute their agent against an arbitrary number of pre-generated flatland environments.


  • Anaconda (By following instructions here) At least version 4.5.11 is required to correctly populate environment.yml.
  • flatland-rl (By following instructions here) IMPORTANT : Please note that you will need flatland-rl version >=2.1.7 to be able to submit.


  • Clone the repository
git clone
cd flatland-challenge-starter-kit
  • Create a conda environment from the provided environment.yml
conda env create -f environment.yml
  • Activate the conda environment and install your code specific dependencies
conda activate flatland-rl
# If say you want to install PyTorch
# conda install pytorch torchvision -c pytorch
# or you can even use pip to install any additional packages
# for example : 
# pip install -U flatland-rl
# which updates the flatland-rl package to the latest version

Test Submission Locally

  • First lets begin by downloading a small set of test envs, and put them at a location of your choice. In this exercise, we assume that you will download the test-envs provided at :, and will untar them inside ./scratch/test-envs, so that you have a directory structure similar to :
└── test-envs
    ├── Test_0
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_1
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_2
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_3
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_4
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_5
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_6
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_7
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    ├── Test_8
    │   ├── Level_0.pkl
    │   └── Level_1.pkl
    └── Test_9
        ├── Level_0.pkl
        └── Level_1.pkl
  • redis-server : NOTE : Please ensure that you have a redis-server running on localhost. You can find more instructions on how to run redis here

  • Run evaluator

# In a separate tab : run local grader
flatland-evaluator --tests <path_to_your_tests_directory>

# If you downloaded the files to the location we specified above, then you should be running : 
flatland-evaluator --tests ./scratch/test-envs/
  • Run Agent(s)
# In a separate tab :
export AICROWD_TESTS_FOLDER=<path_to_your_tests_directory>
# or on Windows :
#  SET AICROWD_TESTS_FOLDER=<path_to_your_tests_directory>

How do I specify my software runtime ?

The software runtime is specified by exporting your conda env to the root of your repository by doing :

# The included environment.yml is generated by the command below, and you do not need to run it again
# if you did not add any custom dependencies

conda env export --no-build > environment.yml

# Note the `--no-build` flag, which is important if you want your anaconda env to be replicable across all

This environment.yml file will be used to recreate the conda environment inside the Docker container. This repository includes an example environment.yml

You can specify your software environment by using all the available configuration options of repo2docker. (But please remember to use aicrowd-repo2docker to have GPU support)

What should my code structure be like ?

Please follow the structure documented in the included to adapt your already existing code to the required structure for this round.

Important Concepts

Repository Structure

  • aicrowd.json Each repository should have a aicrowd.json with the following content :
  "challenge_id": "aicrowd_flatland_challenge_2019",
  "grader_id": "aicrowd_flatland_challenge_2019",
  "authors": ["your-aicrowd-username"],
  "description": "sample description about your awesome agent",
  "license": "MIT",
  "debug": false

This is used to map your submission to the said challenge, so please remember to use the correct challenge_id and grader_id as specified above.

If you set debug to true, then the evaluation will run on a separate set of 20 environments, and the logs from your submitted code (if it fails), will be made available to you to help you debug. NOTE : IMPORTANT : By default we have set debug:false, so when you have done the basic integration testing of your code, and are ready to make a final submission, please do make sure to set debug to true in aicrowd.json.

Code Entrypoint

The evaluator will use /home/aicrowd/ as the entrypoint, so please remember to have a at the root, which can instantitate any necessary environment variables, and also start executing your actual code. This repository includes a sample file. If you are using a Dockerfile to specify your software environment, please remember to create a aicrowd user, and place the entrypoint code at If you are unsure what this is all about, you can let be as is, and instead focus on the which is being called from within


To make a submission, you will have to create a private repository on

You will have to add your SSH Keys to your GitLab account by following the instructions here. If you do not have SSH Keys, you will first need to generate one.

Then you can create a submission by making a tag push to your repository on Any tag push (where the tag name begins with "submission-") to your private repository is considered as a submission
Then you can add the correct git remote, and finally submit by doing :

cd flatland-challenge-starter-kit
# Add AIcrowd git remote endpoint
git remote add aicrowd<YOUR_AICROWD_USER_NAME>/flatland-challenge-starter-kit.git
git push aicrowd master

# Create a tag for your submission and push
git tag -am "submission-v0.1" submission-v0.1
git push aicrowd master
git push aicrowd submission-v0.1

# Note : If the contents of your repository (latest commit hash) does not change,
# then pushing a new tag will **not** trigger a new evaluation.

You now should be able to see the details of your submission at :<YOUR_AICROWD_USER_NAME>/flatland-challenge-starter-kit/issues

NOTE: Remember to update your username in the link above 😉

In the link above, you should start seeing something like this take shape (the whole evaluation can take a bit of time, so please be a bit patient too 😉 ) :

Best of Luck 🎉 🎉


Sharada Mohanty

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