Fix render_mode attribute not being set by sb3 wrapper

pyproject.toml

@@ -25,7 +25,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 # Update dependencies in `all` if any are added or removed
-testing = ["pettingzoo[butterfly,classic]>=1.23.1", "pytest"]
+testing = ["pettingzoo[butterfly,classic]>=1.23.1", "pytest", "stable-baselines3>=2.0.0", "moviepy >=1.0.0"]
 
 [project.urls]
 Homepage = "https://farama.org"

supersuit/vector/sb3_vector_wrapper.py

@@ -12,6 +12,7 @@ def __init__(self, venv):
         self.num_envs = venv.num_envs
         self.observation_space = venv.observation_space
         self.action_space = venv.action_space
+        self.render_mode = venv.render_mode
         self.reset_infos = []
 
     def reset(self, seed=None, options=None):

test/test_vector/test_render.py

@@ -1,25 +1,49 @@
 from pettingzoo.butterfly import pistonball_v6
+from stable_baselines3.common.vec_env import VecVideoRecorder
 
-from supersuit import pettingzoo_env_to_vec_env_v1
+import supersuit as ss
+
+
+def schedule(episode_idx):
+    print(episode_idx)
+    return episode_idx <= 1
+
+
+def make_sb3_record_env():
+    env = pistonball_v6.parallel_env(render_mode="rgb_array")
+    print(env.render_mode)
+    env = ss.pettingzoo_env_to_vec_env_v1(env)
+    envs = ss.concat_vec_envs_v1(env, 1, num_cpus=0, base_class="stable_baselines3")
+    envs = VecVideoRecorder(envs, "/tmp", schedule)
+    return envs
+
+
+def test_record_video_sb3():
+    envs = make_sb3_record_env()
+    envs.reset()
+    for _ in range(100):
+        envs.step([envs.action_space.sample() for _ in range(envs.num_envs)])
+    envs.close()
 
 
 def make_env():
-    env = pistonball_v6.parallel_env()
-    env = pettingzoo_env_to_vec_env_v1(env)
+    env = pistonball_v6.parallel_env(render_mode="rgb_array")
+    env = ss.pettingzoo_env_to_vec_env_v1(env)
     return env
 
 
-# unfortunately this test does not pass
-# def test_vector_render_multiproc():
-#     env = make_env()
-#     num_envs = 3
-#     venv = concat_vec_envs_v1(env, num_envs, num_cpus=num_envs, base_class='stable_baselines3')
-#     venv.reset()
-#     arr = venv.render(mode="rgb_array")
-#     venv.reset()
-#     assert len(arr.shape) == 3 and arr.shape[2] == 3
-#     venv.reset()
-#     try:
-#         venv.close()
-#     except RuntimeError:
-#         pass
+def test_vector_render_multiproc():
+    env = make_env()
+    num_envs = 1
+    venv = ss.concat_vec_envs_v1(
+        env, num_envs, num_cpus=num_envs, base_class="stable_baselines3"
+    )
+    venv.reset()
+    arr = venv.render()
+    venv.reset()
+    assert len(arr.shape) == 3 and arr.shape[2] == 3
+    venv.reset()
+    try:
+        venv.close()
+    except RuntimeError:
+        pass