fix(tests): gate RL tests on the datasets extra

tests/policies/test_gaussian_actor_policy.py

@@ -15,15 +15,18 @@
 # limitations under the License.
 
 import pytest
-import torch
-from torch import Tensor, nn
 
-from lerobot.configs.types import FeatureType, PolicyFeature
-from lerobot.policies.gaussian_actor.configuration_gaussian_actor import GaussianActorConfig
-from lerobot.policies.gaussian_actor.modeling_gaussian_actor import MLP, GaussianActorPolicy
-from lerobot.rl.algorithms.sac import SACAlgorithm, SACAlgorithmConfig
-from lerobot.utils.constants import ACTION, OBS_IMAGE, OBS_STATE
-from lerobot.utils.random_utils import seeded_context, set_seed
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+import torch  # noqa: E402
+from torch import Tensor, nn  # noqa: E402
+
+from lerobot.configs.types import FeatureType, PolicyFeature  # noqa: E402
+from lerobot.policies.gaussian_actor.configuration_gaussian_actor import GaussianActorConfig  # noqa: E402
+from lerobot.policies.gaussian_actor.modeling_gaussian_actor import MLP, GaussianActorPolicy  # noqa: E402
+from lerobot.rl.algorithms.sac import SACAlgorithm, SACAlgorithmConfig  # noqa: E402
+from lerobot.utils.constants import ACTION, OBS_IMAGE, OBS_STATE  # noqa: E402
+from lerobot.utils.random_utils import seeded_context, set_seed  # noqa: E402
 
 try:
     import transformers  # noqa: F401

tests/rl/test_data_mixer.py

@@ -13,11 +13,15 @@
 # limitations under the License.
 """Tests for RL data mixing (DataMixer, OnlineOfflineMixer)."""
 
-import torch
+import pytest
 
-from lerobot.rl.buffer import ReplayBuffer
-from lerobot.rl.data_sources import OnlineOfflineMixer
-from lerobot.utils.constants import OBS_STATE
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+import torch  # noqa: E402
+
+from lerobot.rl.buffer import ReplayBuffer  # noqa: E402
+from lerobot.rl.data_sources import OnlineOfflineMixer  # noqa: E402
+from lerobot.utils.constants import OBS_STATE  # noqa: E402
 
 
 def _make_buffer(capacity: int = 100, state_dim: int = 4) -> ReplayBuffer:

tests/rl/test_queue.py

@@ -18,9 +18,13 @@ import threading
 import time
 from queue import Queue
 
-from torch.multiprocessing import Queue as TorchMPQueue
+import pytest
 
-from lerobot.rl.queue import get_last_item_from_queue
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+from torch.multiprocessing import Queue as TorchMPQueue  # noqa: E402
+
+from lerobot.rl.queue import get_last_item_from_queue  # noqa: E402
 
 
 def test_get_last_item_single_item():

tests/rl/test_sac_algorithm.py

@@ -16,16 +16,19 @@
 """Tests for the RL algorithm abstraction and SACAlgorithm implementation."""
 
 import pytest
-import torch
 
-from lerobot.configs.types import FeatureType, PolicyFeature
-from lerobot.policies.gaussian_actor.configuration_gaussian_actor import GaussianActorConfig
-from lerobot.policies.gaussian_actor.modeling_gaussian_actor import GaussianActorPolicy
-from lerobot.rl.algorithms.configs import RLAlgorithmConfig, TrainingStats
-from lerobot.rl.algorithms.factory import make_algorithm
-from lerobot.rl.algorithms.sac import SACAlgorithm, SACAlgorithmConfig
-from lerobot.utils.constants import ACTION, OBS_IMAGE, OBS_STATE
-from lerobot.utils.random_utils import set_seed
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+import torch  # noqa: E402
+
+from lerobot.configs.types import FeatureType, PolicyFeature  # noqa: E402
+from lerobot.policies.gaussian_actor.configuration_gaussian_actor import GaussianActorConfig  # noqa: E402
+from lerobot.policies.gaussian_actor.modeling_gaussian_actor import GaussianActorPolicy  # noqa: E402
+from lerobot.rl.algorithms.configs import RLAlgorithmConfig, TrainingStats  # noqa: E402
+from lerobot.rl.algorithms.factory import make_algorithm  # noqa: E402
+from lerobot.rl.algorithms.sac import SACAlgorithm, SACAlgorithmConfig  # noqa: E402
+from lerobot.utils.constants import ACTION, OBS_IMAGE, OBS_STATE  # noqa: E402
+from lerobot.utils.random_utils import set_seed  # noqa: E402
 
 # ---------------------------------------------------------------------------
 # Helpers (reuse patterns from tests/policies/test_gaussian_actor_policy.py)

tests/rl/test_trainer.py

@@ -14,13 +14,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import torch
-from torch import Tensor
+import pytest
 
-from lerobot.rl.algorithms.base import RLAlgorithm
-from lerobot.rl.algorithms.configs import TrainingStats
-from lerobot.rl.trainer import RLTrainer
-from lerobot.utils.constants import ACTION, OBS_STATE
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+import torch  # noqa: E402
+from torch import Tensor  # noqa: E402
+
+from lerobot.rl.algorithms.base import RLAlgorithm  # noqa: E402
+from lerobot.rl.algorithms.configs import TrainingStats  # noqa: E402
+from lerobot.rl.trainer import RLTrainer  # noqa: E402
+from lerobot.utils.constants import ACTION, OBS_STATE  # noqa: E402
 
 
 class _DummyRLAlgorithmConfig:

tests/utils/test_process.py

@@ -22,7 +22,9 @@ from unittest.mock import patch
 
 import pytest
 
-from lerobot.rl.process import ProcessSignalHandler
+pytest.importorskip("datasets", reason="datasets is required (install lerobot[dataset])")
+
+from lerobot.rl.process import ProcessSignalHandler  # noqa: E402
 
 
 # Fixture to reset shutdown_event_counter and original signal handlers before and after each test