code: def add_seq_group(self, seq_group: SequenceGroup) -> None:
      # Add sequence groups to the waiting queue.
      self.waiting.append(seq_group)
  
imports: import enum
  import time
  from typing import Dict, Iterable, List, Optional, Tuple, Union
  from bigdl.llm.vllm.config import SchedulerConfig
  from bigdl.llm.vllm.core.policy import PolicyFactory
  from bigdl.llm.vllm.logger import init_logger
  from bigdl.llm.vllm.sequence import SequenceData, SequenceStatus
  from bigdl.llm.vllm.sequence import Sequence, SequenceGroup, SequenceGroupMetadata
  from bigdl.llm.utils.common import invalidInputError
label_desc: Use image node_id 2 for calling the FixedWindowScheduler obj's underlying member method code with example usage: obj.add_seq_group(seq_group) without return types