code: def opt_pre_context_tok(self):
      import projects.bb3.prompts as PROMPT
  
      if (
          (
              self.is_knowledge()
              and self is not Module.CONTEXTUAL_KNOWLEDGE
          )
          or self is Module.GROUNDED_DIALOGUE
          or self is Module.BOT_DIALOGUE
      ):
          return PROMPT.PRE_CONTEXT_TOK
      return ""
  
imports: from enum import Enum
  from typing import Dict, List
  import projects.bb3.constants
label_desc: Use image node_id 20 for calling the Module obj's underlying member method code with example usage: obj.opt_pre_context_tok() and returns: str, PROMPT