fix: Improve CUDA version detection and error handling (#1599)

* fix: Improve CUDA version detection and error handling

* lint fix

* lint fix

bitsandbytes/cuda_specs.py

@@ -21,26 +21,55 @@ def get_compute_capabilities() -> list[tuple[int, int]]:
 
 
 @lru_cache(None)
-def get_cuda_version_tuple() -> tuple[int, int]:
+def get_cuda_version_tuple() -> Optional[tuple[int, int]]:
+    """Get CUDA/HIP version as a tuple of (major, minor)."""
+    try:
         if torch.version.cuda:
-        return tuple(map(int, torch.version.cuda.split(".")[0:2]))
+            version_str = torch.version.cuda
         elif torch.version.hip:
-        return tuple(map(int, torch.version.hip.split(".")[0:2]))
+            version_str = torch.version.hip
+        else:
+            return None
 
+        parts = version_str.split(".")
+        if len(parts) >= 2:
+            return tuple(map(int, parts[:2]))
+        return None
+    except (AttributeError, ValueError, IndexError):
         return None
 
 
-def get_cuda_version_string() -> str:
-    major, minor = get_cuda_version_tuple()
+def get_cuda_version_string() -> Optional[str]:
+    """Get CUDA/HIP version as a string."""
+    version_tuple = get_cuda_version_tuple()
+    if version_tuple is None:
+        return None
+    major, minor = version_tuple
     return f"{major * 10 + minor}"
 
 
 def get_cuda_specs() -> Optional[CUDASpecs]:
+    """Get CUDA/HIP specifications."""
     if not torch.cuda.is_available():
         return None
 
+    try:
+        compute_capabilities = get_compute_capabilities()
+        if not compute_capabilities:
+            return None
+
+        version_tuple = get_cuda_version_tuple()
+        if version_tuple is None:
+            return None
+
+        version_string = get_cuda_version_string()
+        if version_string is None:
+            return None
+
         return CUDASpecs(
-        highest_compute_capability=(get_compute_capabilities()[-1]),
-        cuda_version_string=(get_cuda_version_string()),
-        cuda_version_tuple=get_cuda_version_tuple(),
+            highest_compute_capability=compute_capabilities[-1],
+            cuda_version_string=version_string,
+            cuda_version_tuple=version_tuple,
         )
+    except Exception:
+        return None