[RLlib] Add tests for the Footsies environment #55041

kamil-kaczmarek · 2025-07-30T07:04:28Z

Why are these changes needed?

RLlib tests for Footsies: multi-agent / self-play reinforcement learning environment (for two-players).

Related issue number

n.a.

Checks

I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
I've run scripts/format.sh to lint the changes in this PR.
I've included any doc changes needed for https://docs.ray.io/en/master/.
- I've added any new APIs to the API Reference. For example, if I added a
  method in Tune, I've added it in doc/source/tune/api/ under the
  corresponding .rst file.
I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
Testing Strategy
- Unit tests
- Release tests
- This PR is not tested :(

gemini-code-assist

Summary of Changes

Hello @kamil-kaczmarek, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces the Footsies multi-agent reinforcement learning environment to RLlib. My goal is to provide all necessary components for RLlib to interact with the Footsies game server, including the environment definition, observation encoding, and utilities for managing the game binary. This integration will enable future testing and training of reinforcement learning agents within this two-player fighting game context.

Highlights

New Environment Integration: I've integrated the Footsies multi-agent fighting game as a new environment within RLlib. This supports two-player reinforcement learning scenarios.
Game Server Management: I've added functionality to automatically download, extract, and launch the Footsies game server binary. This supports various operating systems (Linux, Mac) and modes (server, windowed).
Observation and Action Spaces: I've defined the observation and action spaces for the Footsies environment, including a custom encoder for processing raw game state into structured observations and handling of special charge actions.
gRPC Communication Layer: A gRPC communication layer has been established to interact with the Footsies game server, enabling seamless stepping of the environment, retrieval of game states, and management of game resets.
Environment Constants and Utilities: I've introduced dedicated files for environment constants, game actions, action IDs, and observation feature indices, along with utility functions for action-to-bit conversion and observation encoding.

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Code Review

This pull request introduces a new multi-agent environment, Footsies, which is a great addition for RLlib examples. The implementation is thorough, including the environment itself, an encoder for observations, and logic to manage the game binary.

I've found a few critical issues related to incorrect state handling and invalid function arguments that could lead to runtime crashes. I've also identified a high-severity issue where a missing timeout could cause the application to hang. Additionally, I've provided several medium-severity suggestions to improve code maintainability, robustness, and adherence to best practices.

Please review the detailed comments. Addressing the critical and high-severity issues is highly recommended before merging.

rllib/examples/envs/classes/multi_agent/footsies/encoder.py

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

rllib/examples/envs/classes/multi_agent/footsies/encoder.py

rllib/examples/envs/classes/multi_agent/footsies/footsies_binary.py

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

rllib/examples/envs/classes/multi_agent/footsies/game/constants.py

rllib/examples/envs/classes/multi_agent/footsies/game/footsies_game.py

rllib/examples/envs/classes/multi_agent/footsies/game/proto/footsies_service.proto

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

rllib/examples/envs/classes/multi_agent/footsies/encoder.py

kamil-kaczmarek · 2025-07-31T06:20:55Z

@aslonnie for changes in pyproject.toml.

pyproject.toml

rllib/examples/envs/classes/multi_agent/footsies/encoder.py

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

rllib/BUILD

rllib/examples/envs/classes/multi_agent/footsies/game/footsies_binary.py

rllib/examples/multi_agent/multi_agent_footsies.py

rllib/examples/envs/classes/multi_agent/footsies/game/footsies_game.py

rllib/examples/envs/classes/multi_agent/footsies/game/constants.py

rllib/examples/multi_agent/multi_agent_footsies.py

Signed-off-by: Kamil Kaczmarek <[email protected]>

removes the incorrect genrule query and "preclean" function. the "preclean" function does not work with non-local genrules, because the `ci/run/bazel.py` preclean assumes all output files of the genrules under `//:all` are local genrules, and it is trying to temper with the output, which is unsafe for non-local, normal genrules. we are no longer building windows python wheels of different python versions any more. each wheel building for each python version runs on a clean windows CI machine now. Signed-off-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

The CheckAlive functionality checks if a node is alive given a node address. However, multiple nodes can have the same address. The change substituted usages of node address for checking a node's alive status with node id which is unique. Signed-off-by: avibasnet31 <[email protected]> Co-authored-by: Dhyey Shah <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

…ag support (#54886) This pr ensures that the new metric record API behaviour matches the legacy API behaviour especially wrt tag support (only tags registered during metric definition will be recorded + changes to ensure that global tags overwrite locally specified tag values). New test cases have been added to cover these cases and some other missing cases. Signed-off-by: sampan <[email protected]> Co-authored-by: sampan <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

migrating the below files from `_private` to `_common` as part of #53478 - usage (migrating the whole folder as it only had the usage_lib and usage_constants) - three variables from ray_constants - LOGGING_ROTATE_BYTES - LOGGING_ROTATE_BACKUP_COUNT - DEFAULT_MAX_CONCURRENCY_ASYNC --------- Signed-off-by: harshit <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

## Why are these changes needed?  - Return `SampleInfo` with `None` values for empty fragments，prevents errors in downstream processing. ## Related issue number Run the test with debug output to see the full error: ``` def test_read_parquet_with_zero_row_groups(shutdown_only, tmp_path): """Test reading a parquet file with 0 row groups.""" # Create an empty parquet file (0 row groups) empty_path = os.path.join(tmp_path, "empty.parquet") schema = pa.schema({"": pa.int64()}) with pq.ParquetWriter(empty_path, schema) as writer: pass parquet_file = pq.ParquetFile(empty_path) assert parquet_file.num_row_groups == 0 #Test reading the empty parquet file dataset = ray.data.read_parquet(empty_path) assert dataset.count() == 0 ``` ``` values = self.deserialize_objects(serialized_objects, object_refs) if not return_exceptions: # Raise exceptions instead of returning them to the user. for i, value in enumerate(values): if isinstance(value, RayError): if isinstance(value, ray.exceptions.ObjectLostError): global_worker.core_worker.log_plasma_usage() if isinstance(value, RayTaskError): > raise value.as_instanceof_cause() E ray.exceptions.RayTaskError(ArrowIndexError): ray::_sample_fragment() E File "/opt/anaconda3/envs/github_rayenv/lib/python3.10/site-packages/ray/data/_internal/datasource/parquet_datasource.py", line 536, in _sample_fragment E fragment = fragment.subset(row_group_ids=[0]) E File "pyarrow/_dataset_parquet.pyx", line 484, in pyarrow._dataset_parquet.ParquetFileFragment.subset E File "pyarrow/error.pxi", line 154, in pyarrow.lib.pyarrow_internal_check_status E File "pyarrow/error.pxi", line 91, in pyarrow.lib.check_status E pyarrow.lib.ArrowIndexError: ParquetFileFragment references row group 0 but /private/var/folders/kd/vvlnk55927s6l7lty1x2szbr0000gp/T/pytest-of-jyxc-dz-0100532/pytest-11/test_read_parquet_with_zero_ro0/empty.parquet only has 0 row groups /opt/anaconda3/envs/github_rayenv/lib/python3.10/site-packages/ray/_private/worker.py:948: RayTaskError(ArrowIndexError) ```  ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( Signed-off-by: dragongu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

…obal limit (#54986)   ## Why are these changes needed?  If an actor pool operator uses GPUs and concurrency is set higher than the total number of GPUs in the cluster, the resource manager calculates a negative resource budget due to a bug. This PR fixes that issue. ## Related issue number  ## Checks - [ ] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( --------- Signed-off-by: Balaji Veeramani <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

Signed-off-by: Yiwen Xiang <[email protected]> Signed-off-by: Yevet <[email protected]> Co-authored-by: Kai-Hsun Chen <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

…undle` (#54996)   ## Why are these changes needed? This is documented feature to allow custom `resources_per_bundle`. We used to set `num_gpus=1` which might raise exception if user provide `GPU < 1` in the config. `num_gpus < 1` can be useful if we want to use only partial of the GPU ## Related issue number  ## Checks - [x] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [x] I've run `scripts/format.sh` to lint the changes in this PR. - [ ] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [x] Unit tests - [ ] Release tests - [ ] This PR is not tested :( --------- Signed-off-by: Linkun Chen <[email protected]> Signed-off-by: lkchen <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

Signed-off-by: Ryan O'Leary <[email protected]> Signed-off-by: Ryan O'Leary <[email protected]> Co-authored-by: Jiajun Yao <[email protected]> Co-authored-by: Mengjin Yan <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

## Why are these changes needed? As title said Before <img width="1808" height="270" alt="image" src="https://github.com/user-attachments/assets/cb35f7a5-ae82-4969-aa33-cb139fd63ed5" /> After <img width="1147" height="257" alt="image" src="https://github.com/user-attachments/assets/c122004b-79b2-4e7b-b24e-53a428e430d6" />  ## Related issue number  ## Checks - [x] I've signed off every commit(by using the -s flag, i.e., `git commit -s`) in this PR. - [ ] I've run `scripts/format.sh` to lint the changes in this PR. - [x] I've included any doc changes needed for https://docs.ray.io/en/master/. - [ ] I've added any new APIs to the API Reference. For example, if I added a method in Tune, I've added it in `doc/source/tune/api/` under the corresponding `.rst` file. - [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/ - Testing Strategy - [ ] Unit tests - [ ] Release tests - [ ] This PR is not tested :( --------- Signed-off-by: Potato <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

… not load (#55017) Signed-off-by: cong.qian <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

Signed-off-by: joshlee <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

adding raydepsets to test rules (only ci tests will be run when changes are made here) --------- Signed-off-by: elliot-barn <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

refactoring expand operation for raydepsets to allow for depsets and requirement files as input. this makes depset expansion inherit the input depset's requirements --------- Signed-off-by: elliot-barn <[email protected]> Co-authored-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

using fewer local genrules Signed-off-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

unify bazel build file naming conventions across the repository Signed-off-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

…e env runner and eval env runner Signed-off-by: Kamil Kaczmarek <[email protected]>

Signed-off-by: Kamil Kaczmarek <[email protected]>

ArturNiederfahrenhorst

Just some nits. Awesome PR!

ArturNiederfahrenhorst · 2025-08-28T17:40:59Z

rllib/BUILD

+        "multi_gpu",
+        "team:rllib",
+    ],
+)


As discussed in a meeting, there is probably a greater distinction in code coverage and system dynamics between [num_learners=0, num_learners=2] than [num_learners=1, num_learners=2] so we may want to use the former.

ArturNiederfahrenhorst · 2025-08-28T17:47:26Z

rllib/tuned_examples/ppo/multi_agent_footsies_ppo.py

+About:
+    - Example is based on the Footsies environment (https://github.com/chasemcd/FootsiesGym).
+    - Footsies is a two-player fighting game where each player controls a character and tries to hit the opponent while avoiding being hit.
+    - Footsies is a zero-sum game, when one player wins (+1 reward) the other loses (-1 reward).


Is this actually true? I thought there could be situation where both players die?

rllib/examples/multi_agent/self_play_footsies.py

ArturNiederfahrenhorst · 2025-08-28T18:03:32Z

rllib/examples/envs/classes/multi_agent/footsies/encoder.py

+        :param input_buffer: The input buffer to encode
+        :type input_buffer: list[int]
+        :return: The encoded one-hot vector
+        :rtype: np.ndarray


We don't use this style of docstrings. Can we move to https://google.github.io/styleguide/pyguide.html#383-functions-and-methods , please?

ArturNiederfahrenhorst · 2025-08-28T18:08:08Z

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

+        return {agent: {} for agent in self.agents}
+
+    def get_obs(self, game_state):
+        return self.encoder.encode(game_state)


Note for the future: Let's move this out into a connector!

ArturNiederfahrenhorst · 2025-08-28T18:28:15Z

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

+
+            if self.special_charge_queue[agent_id] >= 0:
+                self.special_charge_queue[agent_id] -= 1
+                actions[agent_id] = self._convert_to_charge_action(actions[agent_id])


Just out of curiosity, because I think this is weird: If we let two policies control the two agents and one casts SPECIAL_CHARGE, we override the action that the model choses and then we just learn on that?

rllib/examples/envs/classes/multi_agent/footsies/footsies_env.py

rllib/examples/envs/classes/multi_agent/footsies/utils.py

Signed-off-by: Kamil Kaczmarek <[email protected]>

dstrodtman

Stamping to unblock, but added feedback comments in Slack: https://anyscaleteam.slack.com/archives/C01SDRHDNPP/p1756993479333839?thread_ts=1756993080.660019&cid=C01SDRHDNPP

simonsays1980

LGTM

kamil-kaczmarek self-assigned this Jul 30, 2025

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kamil-kaczmarek changed the title ~~[RLlib] - add tests for the Footsies environment~~ [RLlib] Add tests for the Footsies environment Jul 31, 2025

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kamil-kaczmarek and others added 20 commits August 4, 2025 16:56

added game binary handler, and README

f94c93a

Signed-off-by: Kamil Kaczmarek <[email protected]>

replace json file with dict in constants

bf81f8e

Signed-off-by: Kamil Kaczmarek <[email protected]>

added game files

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footsies encoder, env and typing

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Signed-off-by: Kamil Kaczmarek <[email protected]>

[Docs][KubeRay] add a guide for deploying deepseek on GKE (#54850)

04f808d

Signed-off-by: Yiwen Xiang <[email protected]> Signed-off-by: Yevet <[email protected]> Co-authored-by: Kai-Hsun Chen <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

[Dashboard] Do not store cache to prevent issues where dashboard does…

dd49c0d

… not load (#55017) Signed-off-by: cong.qian <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

[core] Enforce use of raylet client pool (#54925)

775eb5b

Signed-off-by: joshlee <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

[ci] raydepsets: updating test rules (#55028)

846ec8e

adding raydepsets to test rules (only ci tests will be run when changes are made here) --------- Signed-off-by: elliot-barn <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

[ci] remove all copy_to_workspace usage. (#55031)

efa0586

using fewer local genrules Signed-off-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

[ci] rename all doc BUILD files to BUILD.bazel (#55034)

b59ef9f

unify bazel build file naming conventions across the repository Signed-off-by: Lonnie Liu <[email protected]> Signed-off-by: Kamil Kaczmarek <[email protected]>

kamil-kaczmarek and others added 5 commits August 28, 2025 14:59

adding RLModule to the learner_group also automatically adds it to th…

e3ece75

…e env runner and eval env runner Signed-off-by: Kamil Kaczmarek <[email protected]>

Merge branch 'master' into kk-self-play

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fix

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fix

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Merge branch 'master' into kk-self-play

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kamil-kaczmarek and others added 11 commits September 2, 2025 23:20

make experiments scope smaller

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Signed-off-by: Kamil Kaczmarek <[email protected]>

lint

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fix

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simplify

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Merge branch 'master' into kk-self-play

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simplify self play footsies example

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fix

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lint

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Merge branch 'master' into kk-self-play

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reconfigure tests

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Merge branch 'master' into kk-self-play

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[RLlib] Add tests for the Footsies environment #55041

[RLlib] Add tests for the Footsies environment #55041

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kamil-kaczmarek commented Jul 30, 2025 •

edited

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