[BugFix] Fix broken gym tests (#1980)

.github/unittest/linux/scripts/run_all.sh

@@ -194,11 +194,11 @@ pytest test/smoke_test_deps.py -v --durations 200 -k 'test_gym or test_dm_contro
 if [ "${CU_VERSION:-}" != cpu ] ; then
   python .github/unittest/helpers/coverage_run_parallel.py -m pytest test \
     --instafail --durations 200 -vv --capture no --ignore test/test_rlhf.py \
-    --timeout=120
+    --timeout=120 --mp_fork_if_no_cuda
 else
   python .github/unittest/helpers/coverage_run_parallel.py -m pytest test \
     --instafail --durations 200 -vv --capture no --ignore test/test_rlhf.py --ignore test/test_distributed.py \
-    --timeout=120
+    --timeout=120 --mp_fork_if_no_cuda
 fi
 
 coverage combine

.github/unittest/linux_distributed/scripts/run_test.sh

@@ -23,6 +23,6 @@ export BATCHED_PIPE_TIMEOUT=60
 
 python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/smoke_test.py -v --durations 200
 python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/smoke_test_deps.py -v --durations 200 -k 'test_gym or test_dm_control_pixels or test_dm_control or test_tb'
-python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/test_distributed.py --instafail -v --durations 200
+python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/test_distributed.py --instafail -v --durations 200 --mp_fork_if_no_cuda
 coverage combine
 coverage xml -i

.github/unittest/linux_libs/scripts_gym/batch_scripts.sh

@@ -19,10 +19,10 @@ apt-get update && apt-get install -y git wget libglew-dev libx11-dev x11proto-de
 # solves "'extras_require' must be a dictionary"
 pip install setuptools==65.3.0
 
-mkdir third_party
-cd third_party
-git clone https://github.com/vmoens/gym
-cd ..
+#mkdir -p third_party
+#cd third_party
+#git clone https://github.com/vmoens/gym
+#cd ..
 
 # This version is installed initially (see environment.yml)
 for GYM_VERSION in '0.13'
@@ -38,7 +38,7 @@ do
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
 
 # gym[atari]==0.19 is broken, so we install only gym without dependencies.
@@ -57,7 +57,7 @@ do
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
 
 # gym[atari]==0.20 installs ale-py==0.8, but this version is not compatible with gym<0.26, so we downgrade it.
@@ -76,7 +76,7 @@ do
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
 
 for GYM_VERSION in '0.25'
@@ -92,7 +92,7 @@ do
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
 
 # For this version "gym[accept-rom-license]" is required.
@@ -104,65 +104,42 @@ do
   conda activate ./cloned_env
 
   echo "Testing gym version: ${GYM_VERSION}"
-  pip3 install 'gym[accept-rom-license]'==$GYM_VERSION
-  pip3 install 'gym[atari]'==$GYM_VERSION
+  pip3 install 'gym[atari,accept-rom-license]'==$GYM_VERSION
   pip3 install gym-super-mario-bros
   $DIR/run_test.sh
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
 
 # For this version "gym[accept-rom-license]" is required.
-for GYM_VERSION in '0.27'
+for GYM_VERSION in '0.27' '0.28'
 do
   # Create a copy of the conda env and work with this
   conda deactivate
   conda create --prefix ./cloned_env --clone ./env -y
   conda activate ./cloned_env
 
   echo "Testing gym version: ${GYM_VERSION}"
-  pip3 install 'gymnasium[accept-rom-license]'==$GYM_VERSION
-
-
-  if [[ $OSTYPE != 'darwin'* ]]; then
-    # install ale-py: manylinux names are broken for CentOS so we need to manually download and
-    # rename them
-    PY_VERSION=$(python --version)
-    if [[ $PY_VERSION == *"3.7"* ]]; then
-      wget https://files.pythonhosted.org/packages/ab/fd/6615982d9460df7f476cad265af1378057eee9daaa8e0026de4cedbaffbd/ale_py-0.8.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      pip install ale_py-0.8.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      rm ale_py-0.8.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-    elif [[ $PY_VERSION == *"3.8"* ]]; then
-      wget https://files.pythonhosted.org/packages/0f/8a/feed20571a697588bc4bfef05d6a487429c84f31406a52f8af295a0346a2/ale_py-0.8.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      pip install ale_py-0.8.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      rm ale_py-0.8.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-    elif [[ $PY_VERSION == *"3.9"* ]]; then
-      wget https://files.pythonhosted.org/packages/a0/98/4316c1cedd9934f9a91b6e27a9be126043b4445594b40cfa391c8de2e5e8/ale_py-0.8.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      pip install ale_py-0.8.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      rm ale_py-0.8.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-    elif [[ $PY_VERSION == *"3.10"* ]]; then
-      wget https://files.pythonhosted.org/packages/60/1b/3adde7f44f79fcc50d0a00a0643255e48024c4c3977359747d149dc43500/ale_py-0.8.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
-      mv ale_py-0.8.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl ale_py-0.8.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      pip install ale_py-0.8.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      rm ale_py-0.8.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-    elif [[ $PY_VERSION == *"3.11"* ]]; then
-      wget https://files.pythonhosted.org/packages/60/1b/3adde7f44f79fcc50d0a00a0643255e48024c4c3977359747d149dc43500/ale_py-0.8.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
-      mv ale_py-0.8.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl ale_py-0.8.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      pip install ale_py-0.8.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-      rm ale_py-0.8.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
-    fi
-    pip install gymnasium[atari]
-  else
-    pip install gymnasium[atari]
-  fi
-  pip install mo-gymnasium
-  pip install gymnasium-robotics
+  pip3 install 'gymnasium[atari,accept-rom-license,ale-py]'==$GYM_VERSION
 
   $DIR/run_test.sh
 
   # delete the conda copy
   conda deactivate
-  conda env remove --prefix ./cloned_env
+  conda env remove --prefix ./cloned_env -y
 done
+
+# Latest gymnasium
+conda deactivate
+conda create --prefix ./cloned_env --clone ./env -y
+conda activate ./cloned_env
+
+pip3 install 'gymnasium[accept-rom-license,ale-py,atari]' mo-gymnasium gymnasium-robotics -U
+
+$DIR/run_test.sh
+
+# delete the conda copy
+conda deactivate
+conda env remove --prefix ./cloned_env -y

.github/unittest/linux_libs/scripts_gym/run_test.sh

@@ -23,6 +23,6 @@ python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/smoke_te
 
 export DISPLAY=':99.0'
 Xvfb :99 -screen 0 1400x900x24 > /dev/null 2>&1 &
-python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/test_libs.py --instafail -v --durations 200 -k "gym and not isaac" --error-for-skips
+python .github/unittest/helpers/coverage_run_parallel.py -m pytest test/test_libs.py --instafail -v --durations 200 -k "gym and not isaac" --error-for-skips --mp_fork
 coverage combine
 coverage xml -i

test/_utils_internal.py

@@ -24,7 +24,7 @@
 from torchrl.envs import MultiThreadedEnv, ObservationNorm
 from torchrl.envs.batched_envs import ParallelEnv, SerialEnv
 from torchrl.envs.libs.envpool import _has_envpool
-from torchrl.envs.libs.gym import _has_gym, GymEnv
+from torchrl.envs.libs.gym import _has_gym, gym_backend, GymEnv
 from torchrl.envs.transforms import (
     Compose,
     RewardClipping,
@@ -35,41 +35,72 @@
 # Specified for test_utils.py
 __version__ = "0.3"
 
-# Default versions of the environments.
-CARTPOLE_VERSIONED = "CartPole-v1"
-HALFCHEETAH_VERSIONED = "HalfCheetah-v4"
-PENDULUM_VERSIONED = "Pendulum-v1"
-PONG_VERSIONED = "ALE/Pong-v5"
+
+def CARTPOLE_VERSIONED():
+    # load gym
+    if gym_backend() is not None:
+        _set_gym_environments()
+        return _CARTPOLE_VERSIONED
+
+
+def HALFCHEETAH_VERSIONED():
+    # load gym
+    if gym_backend() is not None:
+        _set_gym_environments()
+        return _HALFCHEETAH_VERSIONED
+
+
+def PONG_VERSIONED():
+    # load gym
+    if gym_backend() is not None:
+        _set_gym_environments()
+        return _PONG_VERSIONED
+
+
+def PENDULUM_VERSIONED():
+    # load gym
+    if gym_backend() is not None:
+        _set_gym_environments()
+        return _PENDULUM_VERSIONED
+
+
+def _set_gym_environments():
+    global _CARTPOLE_VERSIONED, _HALFCHEETAH_VERSIONED, _PENDULUM_VERSIONED, _PONG_VERSIONED
+
+    _CARTPOLE_VERSIONED = None
+    _HALFCHEETAH_VERSIONED = None
+    _PENDULUM_VERSIONED = None
+    _PONG_VERSIONED = None
 
 
 @implement_for("gym", None, "0.21.0")
 def _set_gym_environments():  # noqa: F811
-    global CARTPOLE_VERSIONED, HALFCHEETAH_VERSIONED, PENDULUM_VERSIONED, PONG_VERSIONED
+    global _CARTPOLE_VERSIONED, _HALFCHEETAH_VERSIONED, _PENDULUM_VERSIONED, _PONG_VERSIONED
 
-    CARTPOLE_VERSIONED = "CartPole-v0"
-    HALFCHEETAH_VERSIONED = "HalfCheetah-v2"
-    PENDULUM_VERSIONED = "Pendulum-v0"
-    PONG_VERSIONED = "Pong-v4"
+    _CARTPOLE_VERSIONED = "CartPole-v0"
+    _HALFCHEETAH_VERSIONED = "HalfCheetah-v2"
+    _PENDULUM_VERSIONED = "Pendulum-v0"
+    _PONG_VERSIONED = "Pong-v4"
 
 
 @implement_for("gym", "0.21.0", None)
 def _set_gym_environments():  # noqa: F811
-    global CARTPOLE_VERSIONED, HALFCHEETAH_VERSIONED, PENDULUM_VERSIONED, PONG_VERSIONED
+    global _CARTPOLE_VERSIONED, _HALFCHEETAH_VERSIONED, _PENDULUM_VERSIONED, _PONG_VERSIONED
 
-    CARTPOLE_VERSIONED = "CartPole-v1"
-    HALFCHEETAH_VERSIONED = "HalfCheetah-v4"
-    PENDULUM_VERSIONED = "Pendulum-v1"
-    PONG_VERSIONED = "ALE/Pong-v5"
+    _CARTPOLE_VERSIONED = "CartPole-v1"
+    _HALFCHEETAH_VERSIONED = "HalfCheetah-v4"
+    _PENDULUM_VERSIONED = "Pendulum-v1"
+    _PONG_VERSIONED = "ALE/Pong-v5"
 
 
 @implement_for("gymnasium")
 def _set_gym_environments():  # noqa: F811
-    global CARTPOLE_VERSIONED, HALFCHEETAH_VERSIONED, PENDULUM_VERSIONED, PONG_VERSIONED
+    global _CARTPOLE_VERSIONED, _HALFCHEETAH_VERSIONED, _PENDULUM_VERSIONED, _PONG_VERSIONED
 
-    CARTPOLE_VERSIONED = "CartPole-v1"
-    HALFCHEETAH_VERSIONED = "HalfCheetah-v4"
-    PENDULUM_VERSIONED = "Pendulum-v1"
-    PONG_VERSIONED = "ALE/Pong-v5"
+    _CARTPOLE_VERSIONED = "CartPole-v1"
+    _HALFCHEETAH_VERSIONED = "HalfCheetah-v4"
+    _PENDULUM_VERSIONED = "Pendulum-v1"
+    _PONG_VERSIONED = "ALE/Pong-v5"
 
 
 if _has_gym:
@@ -171,7 +202,7 @@ def create_env_fn():
             return GymEnv(env_name, frame_skip=frame_skip, device=device)
 
     else:
-        if env_name == PONG_VERSIONED:
+        if env_name == PONG_VERSIONED():
 
             def create_env_fn():
                 base_env = GymEnv(env_name, frame_skip=frame_skip, device=device)
@@ -250,7 +281,7 @@ def _make_multithreaded_env(
 
     torch.manual_seed(0)
     multithreaded_kwargs = (
-        {"frame_skip": frame_skip} if env_name == PONG_VERSIONED else {}
+        {"frame_skip": frame_skip} if env_name == PONG_VERSIONED() else {}
     )
     env_multithread = MultiThreadedEnv(
         N,
@@ -274,7 +305,7 @@ def _make_multithreaded_env(
 
 def get_transform_out(env_name, transformed_in, obs_key=None):
 
-    if env_name == PONG_VERSIONED:
+    if env_name == PONG_VERSIONED():
         if obs_key is None:
             obs_key = "pixels"
 

test/conftest.py

@@ -2,16 +2,16 @@
 #
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
-
 import os
-
+import sys
 import time
 import warnings
 from collections import defaultdict
 
 import pytest
 
 CALL_TIMES = defaultdict(lambda: 0.0)
+IS_OSX = sys.platform == "darwin"
 
 
 def pytest_sessionfinish(maxprint=50):
@@ -97,6 +97,20 @@ def pytest_addoption(parser):
         "--runslow", action="store_true", default=False, help="run slow tests"
     )
 
+    parser.addoption(
+        "--mp_fork",
+        action="store_true",
+        default=False,
+        help="Use 'fork' start method for mp dedicated tests.",
+    )
+
+    parser.addoption(
+        "--mp_fork_if_no_cuda",
+        action="store_true",
+        default=False,
+        help="Use 'fork' start method for mp dedicated tests only if there is no cuda device available.",
+    )
+
 
 def pytest_configure(config):
     config.addinivalue_line("markers", "slow: mark test as slow to run")
@@ -110,3 +124,11 @@ def pytest_collection_modifyitems(config, items):
     for item in items:
         if "slow" in item.keywords:
             item.add_marker(skip_slow)
+
+
+@pytest.fixture
+def maybe_fork_ParallelEnv(request):
+    # Feature available from 0.4 only
+    from torchrl.envs import ParallelEnv
+
+    return ParallelEnv

test/smoke_test_deps.py

@@ -48,7 +48,7 @@ def test_gym():
     assert _has_gym
     from _utils_internal import PONG_VERSIONED
 
-    env = GymEnv(PONG_VERSIONED)
+    env = GymEnv(PONG_VERSIONED())
     env.reset()
 
 

test/test_collector.py

@@ -598,7 +598,7 @@ def make_env():
         # This is currently necessary as the methods in GymWrapper may have mismatching backend
         # versions.
         with set_gym_backend(gym_backend()):
-            return TransformedEnv(GymEnv(PONG_VERSIONED, frame_skip=4), StepCounter())
+            return TransformedEnv(GymEnv(PONG_VERSIONED(), frame_skip=4), StepCounter())
 
     if parallel:
         env = ParallelEnv(2, make_env)
@@ -1076,7 +1076,9 @@ def test_collector_vecnorm_envcreator(static_seed):
     from torchrl.envs.libs.gym import GymEnv
 
     num_envs = 4
-    env_make = EnvCreator(lambda: TransformedEnv(GymEnv(PENDULUM_VERSIONED), VecNorm()))
+    env_make = EnvCreator(
+        lambda: TransformedEnv(GymEnv(PENDULUM_VERSIONED()), VecNorm())
+    )
     env_make = ParallelEnv(num_envs, env_make)
 
     policy = RandomPolicy(env_make.action_spec)
@@ -1293,7 +1295,7 @@ def test_collector_output_keys(
 
     policy = SafeModule(**policy_kwargs)
 
-    env_maker = lambda: GymEnv(PENDULUM_VERSIONED)
+    env_maker = lambda: GymEnv(PENDULUM_VERSIONED())
 
     policy(env_maker().reset())
 
@@ -1432,7 +1434,7 @@ class TestAutoWrap:
     def env_maker(self):
         from torchrl.envs.libs.gym import GymEnv
 
-        return lambda: GymEnv(PENDULUM_VERSIONED)
+        return lambda: GymEnv(PENDULUM_VERSIONED())
 
     def _create_collector_kwargs(self, env_maker, collector_class, policy):
         collector_kwargs = {