fix: support cuda:0, cuda:1 in string selection (#2256)

* fix

* update func 2

* update nightly

* fix quality

* ignore test_dynamixel

.github/workflows/nightly.yml

@@ -189,5 +189,5 @@ jobs:
           python -c "import torch; print(f'PyTorch CUDA available: {torch.cuda.is_available()}'); print(f'Number of GPUs: {torch.cuda.device_count()}')"
 
       - name: Run multi-GPU training tests
-        run: pytest tests/training/test_multi_gpu.py -vv --maxfail=3
+        run: pytest tests -vv --maxfail=10 --ignore=tests/motors/test_dynamixel.py
         timeout-minutes: 10

src/lerobot/configs/policies.py

@@ -58,7 +58,7 @@ class PreTrainedConfig(draccus.ChoiceRegistry, HubMixin, abc.ABC):  # type: igno
     input_features: dict[str, PolicyFeature] = field(default_factory=dict)
     output_features: dict[str, PolicyFeature] = field(default_factory=dict)
 
-    device: str | None = None  # cuda | cpu | mp
+    device: str | None = None  # e.g. "cuda", "cuda:0", "cpu", or "mps"
     # `use_amp` determines whether to use Automatic Mixed Precision (AMP) for training and evaluation. With AMP,
     # automatic gradient scaling is used.
     use_amp: bool = False

src/lerobot/utils/utils.py

@@ -57,25 +57,23 @@ def auto_select_torch_device() -> torch.device:
 def get_safe_torch_device(try_device: str, log: bool = False) -> torch.device:
     """Given a string, return a torch.device with checks on whether the device is available."""
     try_device = str(try_device)
-    match try_device:
-        case "cuda":
-            assert torch.cuda.is_available()
-            device = torch.device("cuda")
-        case "mps":
-            assert torch.backends.mps.is_available()
-            device = torch.device("mps")
-        case "xpu":
-            assert torch.xpu.is_available()
-            device = torch.device("xpu")
-        case "cpu":
-            device = torch.device("cpu")
-            if log:
-                logging.warning("Using CPU, this will be slow.")
-        case _:
-            device = torch.device(try_device)
-            if log:
-                logging.warning(f"Using custom {try_device} device.")
-
+    if try_device.startswith("cuda"):
+        assert torch.cuda.is_available()
+        device = torch.device(try_device)
+    elif try_device == "mps":
+        assert torch.backends.mps.is_available()
+        device = torch.device("mps")
+    elif try_device == "xpu":
+        assert torch.xpu.is_available()
+        device = torch.device("xpu")
+    elif try_device == "cpu":
+        device = torch.device("cpu")
+        if log:
+            logging.warning("Using CPU, this will be slow.")
+    else:
+        device = torch.device(try_device)
+        if log:
+            logging.warning(f"Using custom {try_device} device.")
     return device
 
 
@@ -108,7 +106,7 @@ def get_safe_dtype(dtype: torch.dtype, device: str | torch.device):
 
 def is_torch_device_available(try_device: str) -> bool:
     try_device = str(try_device)  # Ensure try_device is a string
-    if try_device == "cuda":
+    if try_device.startswith("cuda"):
         return torch.cuda.is_available()
     elif try_device == "mps":
         return torch.backends.mps.is_available()