[misc] add sglang support for hdfs file load (volcengine#1060)

Author: BearBiscuit05

verl/workers/fsdp_workers.py

@@ -353,7 +353,8 @@ def _build_rollout(self, trust_remote_code=False):
             # check: https://github.com/sgl-project/sglang/blob/00f42707eaddfc2c0528e5b1e0094025c640b7a0/python/sglang/srt/layers/quantization/fp8_utils.py#L76
             from verl.workers.sharding_manager.fsdp_sglang import FSDPSGLangShardingManager
             log_gpu_memory_usage(f'Before building {rollout_name} rollout', logger=None)
-            rollout = SGLangRollout(actor_module=self.config.model.path,
+            local_path = copy_to_local(self.config.model.path)
+            rollout = SGLangRollout(actor_module=local_path,
                                     config=self.config.rollout,
                                     tokenizer=self.tokenizer,
                                     model_hf_config=self.actor_model_config)