[Core] Logprobs support in Multi-step (#7652)

vllm/executor/multiproc_gpu_executor.py

@@ -14,7 +14,8 @@ from vllm.executor.gpu_executor import create_worker
 from vllm.executor.multiproc_worker_utils import (ProcessWorkerWrapper,
                                                   ResultHandler, WorkerMonitor)
 from vllm.logger import init_logger
-from vllm.sequence import ExecuteModelRequest, SamplerOutput
+from vllm.model_executor.layers.sampler import SamplerOutput
+from vllm.sequence import ExecuteModelRequest
 from vllm.triton_utils import maybe_set_triton_cache_manager
 from vllm.utils import (_run_task_with_lock, cuda_device_count_stateless,
                         get_distributed_init_method, get_open_port,