Facts (NeMo Guardrail)

flow self check facts
  """Check if the previous answer is accurate w.r.t. the relevant chunks.

  This output rail must be enabled explicitly per output message by setting
  the $check_facts context variable to True.
  """
  if $check_facts == True
    global $check_facts
    $check_facts = False

    $accuracy = await SelfCheckFactsAction
    if $accuracy < 0.5
      if $system.config.enable_rails_exceptions
        send FactCheckRailException(message="Fact check failed. The accuracy of the previous answer was below the required threshold.")
      else
        bot refuse to respond
      abort