Source Code Credit

This repo contains the source code for the gym wrapper of μRTS authored by Santiago Ontañón and experiments written by Julian Pandelakis and Jessee Ruiz. The following installation instructions are those relevant to our work (no partial observations or multi-map training) and environment space (actions space and observation space) tables are the work of the maintainers of MicroRTS-Py.

Evaluation Quickstart

Installation

First, clone the github repo and follow the installation instructions. Contact Julian Pandelakis at pandelak@bc.edu or (602) 500-8778 if you have any issues with installation. You will likely have to install an older version of python than what is currently installed on your machine. Use sudo apt-get install python3.9 for the version we used.

Evaluation and video recording

```bash

Activate your poetry shell first, otherwise prefix all commands to run a program with poetry run

cd experiments python ppogridneteval.py --capture-video True \ --agent-model-path models/MicroRTSGridModeVecEnvppo_gridnet1_1733453134/4982784.pt \ --model-type ppogridnet \ --ai coacAI ``` If capture video is true, a game from the evaluation run will be saved as a .mp4 file in /experiments/videos.

Get Started

Prerequisites: * Python 3.8+ * Poetry * Java 8.0+ * FFmpeg (for video recording utilities)

```bash $ git clone --recursive https://github.com/Farama-Foundation/MicroRTS-Py.git && \ cd MicroRTS-Py poetry install

The poetry install command above creates a virtual environment for us, in which all the dependencies are installed.

We can use poetry shell to create a new shell in which this environment is activated. Once we are done working with

MicroRTS, we can leave it again using exit.

poetry shell

By default, the torch wheel is built with CUDA 10.2. If you are using newer NVIDIA GPUs (e.g., 3060 TI), you may need to specifically install CUDA 11.3 wheels by overriding the torch dependency with pip:

poetry run pip install "torch==1.12.1" --upgrade --extra-index-url https://download.pytorch.org/whl/cu113

python hello_world.py ```

If the poetry install command gets stuck on a Linux machine, it may help to first run: export PYTHON_KEYRING_BACKEND=keyring.backends.null.Keyring.

To train an agent, run the following

bash cd experiments python ppo_gridnet.py \ --total-timesteps 100000000 \ --capture-video \ --seed 1

For running a partial observable example, tune the partial_obs argument. bash cd experiments python ppo_gridnet.py \ --partial-obs \ --capture-video \ --seed 1

Technical Paper

Before diving into the code, we highly recommend reading the preprint of our paper: Gym-μRTS: Toward Affordable Deep Reinforcement Learning Research in Real-time Strategy Games.

Environment Specification

Here is a description of Gym-μRTS's observation and action space:

• Observation Space. (Box(0, 1, (h, w, 29), int32)) Given a map of size h x w, the observation is a tensor of shape (h, w, n_f), where n_f is a number of feature planes that have binary values. The observation space used in the original paper used 27 feature planes. Since then, 2 more feature planes (for terrain/walls) have been added, increasing the number of feature planes to 29, as shown below. A feature plane can be thought of as a concatenation of multiple one-hot encoded features. As an example, the unit at a cell could be encoded as follows:

  • the unit has 1 hit point -> [0,1,0,0,0]
  • the unit is not carrying any resources, -> [1,0,0,0,0]
  • the unit is owned by Player 1 -> [0,1,0]
  • the unit is a worker -> [0,0,0,0,1,0,0,0]
  • the unit is not executing any actions -> [1,0,0,0,0,0]
  • the unit is standing at free terrain cell -> [1,0]

  The 29 values of each feature plane for the position in the map of such a worker will thus be:

  [0,1,0,0,0, 1,0,0,0,0, 0,1,0, 0,0,0,0,1,0,0,0, 1,0,0,0,0,0, 1,0]

• Partial Observation Space. (Box(0, 1, (h, w, 31), int32)) under the partial observation space, there are two additional binary planes, indicating visibility for the player and their opponent, respectively. If a cell is visible to the player, the second-to-last channel will contain a value of 1. If the player knows that a cell is visible to the opponent (because the player can observe a nearby enemy unit), the last channel will contain a value of 1. Using the example above and assuming that the worker unit is not visible to the opponent, then the 31 values of each feature plane for the position in the map of such worker will thus be:

  [0,1,0,0,0, 1,0,0,0,0, 0,1,0, 0,0,0,0,1,0,0,0, 1,0,0,0,0,0, 1,0, 1,0]

• Action Space. (MultiDiscrete(concat(h * w * [[6 4 4 4 4 7 a_r]]))) Given a map of size h x w and the maximum attack range a_r=7, the action is an (7hw)-dimensional vector of discrete values as specified in the following table. The first 7 component of the action vector represents the actions issued to the unit at x=0,y=0, and the second 7 component represents actions issued to the unit at x=0,y=1, etc. In these 7 components, the first component is the action type, and the rest of components represent the different parameters different action types can take. Depending on which action type is selected, the game engine will use the corresponding parameters to execute the action. As an example, if the RL agent issues a move south action to the worker at $x=0, y=1$ in a 2x2 map, the action will be encoded in the following way:

  concat([0,0,0,0,0,0,0], [1,2,0,0,0,0,0], [0,0,0,0,0,0,0], [0,0,0,0,0,0,0]] =[0,0,0,0,0,0,0,1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]

Here are tables summarizing observation features and action components, where $a_r=7$ is the maximum attack range, and - means not applicable.

| Observation Features | Planes | Description | |-----------------------------|--------------------|----------------------------------------------------------| | Hit Points | 5 | 0, 1, 2, 3, $\geq 4$ | | Resources | 5 | 0, 1, 2, 3, $\geq 4$ | | Owner | 3 | -,player 1, player 2 | | Unit Types | 8 | -, resource, base, barrack, worker, light, heavy, ranged | | Current Action | 6 | -, move, harvest, return, produce, attack | | Terrain | 2 | free, wall |

| Action Components | Range | Description | |-----------------------------|--------------------|----------------------------------------------------------| | Source Unit | $[0,h \times w-1]$ | the location of the unit selected to perform an action | | Action Type | $[0,5]$ | NOOP, move, harvest, return, produce, attack | | Move Parameter | $[0,3]$ | north, east, south, west | | Harvest Parameter | $[0,3]$ | north, east, south, west | | Return Parameter | $[0,3]$ | north, east, south, west | | Produce Direction Parameter | $[0,3]$ | north, east, south, west | | Produce Type Parameter | $[0,6]$ | resource, base, barrack, worker, light, heavy, ranged | | Relative Attack Position | $[0,a_r^2 - 1]$ | the relative location of the unit that will be attacked |

Evaluation

You can evaluate trained agents against a built-in bot:

bash cd experiments python ppo_gridnet_eval.py \ --agent-model-path gym-microrts-static-files/agent_sota.pt \ --ai coacAI

Alternatively, you can evaluate the trained RL bots against themselves

bash cd experiments python ppo_gridnet_eval.py \ --agent-model-path gym-microrts-static-files/agent_sota.pt \ --agent2-model-path gym-microrts-static-files/agent_sota.pt

Evaluate Trueskill of the agents

This repository already contains a preset Trueskill database in experiments/league.db. To evaluate a new AI, try running the following command, which will iteratively find good matches for agent.pt until the engine is confident agent.pt's Trueskill (by having the agent's Trueskill sigma below --highest-sigma 1.4).

bash cd experiments python league.py --evals gym-microrts-static-files/agent_sota.pt --highest-sigma 1.4 --update-db False

To recreate the preset Trueskill database, start a round-robin Trueskill evaluation among built-in AIs by removing the database in experiments/league.db. bash cd experiments rm league.csv league.db python league.py --evals randomBiasedAI workerRushAI lightRushAI coacAI

Known issues

[ ] Rendering does not exactly work in macos. See https://github.com/jpype-project/jpype/issues/906

Papers written using Gym-μRTS

• AIIDE 2022 Strategy Games Workshop: Transformers as Policies for Variable Action Environments
• CoG 2021: Gym-μRTS: Toward Affordable Deep Reinforcement Learning Research in Real-time Strategy Games,
• AAAI RLG 2021: Generalization in Deep Reinforcement Learning with Real-time Strategy Games,
• AIIDE 2020 Strategy Games Workshop: Action Guidance: Getting the Best of Training Agents with Sparse Rewards and Shaped Rewards,
• AIIDE 2019 Strategy Games Workshop: Comparing Observation and Action Representations for Deep Reinforcement Learning in MicroRTS,

Cite this project

To cite the Gym-µRTS simulator:

bibtex @inproceedings{huang2021gym, author = {Shengyi Huang and Santiago Onta{\~{n}}{\'{o}}n and Chris Bamford and Lukasz Grela}, title = {Gym-{\(\mathrm{\mu}\)}RTS: Toward Affordable Full Game Real-time Strategy Games Research with Deep Reinforcement Learning}, booktitle = {2021 {IEEE} Conference on Games (CoG), Copenhagen, Denmark, August 17-20, 2021}, pages = {671--678}, publisher = {{IEEE}}, year = {2021}, url = {https://doi.org/10.1109/CoG52621.2021.9619076}, doi = {10.1109/CoG52621.2021.9619076}, timestamp = {Fri, 10 Dec 2021 10:41:01 +0100}, biburl = {https://dblp.org/rec/conf/cig/HuangO0G21.bib}, bibsource = {dblp computer science bibliography, https://dblp.org} }

To cite the invalid action masking technique used in our training script:

bibtex @inproceedings{huang2020closer, author = {Shengyi Huang and Santiago Onta{\~{n}}{\'{o}}n}, editor = {Roman Bart{\'{a}}k and Fazel Keshtkar and Michael Franklin}, title = {A Closer Look at Invalid Action Masking in Policy Gradient Algorithms}, booktitle = {Proceedings of the Thirty-Fifth International Florida Artificial Intelligence Research Society Conference, {FLAIRS} 2022, Hutchinson Island, Jensen Beach, Florida, USA, May 15-18, 2022}, year = {2022}, url = {https://doi.org/10.32473/flairs.v35i.130584}, doi = {10.32473/flairs.v35i.130584}, timestamp = {Thu, 09 Jun 2022 16:44:11 +0200}, biburl = {https://dblp.org/rec/conf/flairs/HuangO22.bib}, bibsource = {dblp computer science bibliography, https://dblp.org} }