[Feat][RL][1/2] Native Weight Syncing API: NCCL (#31943)

Signed-off-by: ahao-anyscale <ahao@anyscale.com>
Signed-off-by: Aaron Hao <ahao@anyscale.com>
Co-authored-by: SumanthRH <sumanthrh99@gmail.com>

vllm/config/weight_transfer.py

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from dataclasses import dataclass
+from typing import Literal
+
+from vllm.config.utils import config
+
+
+@config
+@dataclass
+class WeightTransferConfig:
+    """Configuration for weight transfer during RL training."""
+
+    backend: Literal["nccl"] = "nccl"
+    """The backend to use for weight transfer."""