code: def prepare_full_key(
      instance_id: str, key: str, secondary_key: Optional[str] = None
  ):
      if secondary_key is not None:
          return instance_id + "." + key + "." + secondary_key
      else:
          return instance_id + "." + key
  
file_path: pytext/pytext/models/seq_models/utils.py
imports: import logging
  from typing import Dict, List, Optional
  import torch
  import torch.nn.functional
  from torch import nn, Tensor
label_desc: Use image node_id 2 for calling a global function with example usage: prepare_full_key(instance_id, key, secondary_key) and returns: unknown, unknown