code: def _set_timers():
      """Initialize timers."""
      global _GLOBAL_TIMERS
      _ensure_var_is_not_initialized(_GLOBAL_TIMERS, "timers")
      _GLOBAL_TIMERS = _Timers()
  
imports: from typing import Optional, List, Union, Tuple
  import torch
  from torch.nn.parallel import DistributedDataParallel
  from apex.multi_tensor_apply import multi_tensor_applier
  from apex.transformer import parallel_state
  from apex.transformer.enums import ModelType
  from apex.transformer.microbatches import build_num_microbatches_calculator
  from apex.transformer.pipeline_parallel._timers import _Timers
label_desc: Use image node_id 13 for calling a global function with example usage: _set_timers() without return types