code: def get_priority(
      self,
      now: float,
      seq_group: SequenceGroup,
  ) -> float:
      return now - seq_group.arrival_time
  
file_path: BigDL/python/llm/src/bigdl/llm/vllm/core/policy.py
imports: from typing import List
  from bigdl.llm.vllm.sequence import SequenceGroup
  from bigdl.llm.utils.common import invalidInputError
label_desc: Use image node_id 1 for calling the FCFS obj's underlying member method code with example usage: obj.get_priority(now, seq_group) and returns: unknown