code: def get_nq_tokens(simplified_nq_example):
      """
      Returns list of blank separated tokens.
      """
  
      if "document_text" not in simplified_nq_example:
          raise ValueError(
              "`get_nq_tokens` should be called on a simplified NQ"
              "example that contains the `document_text` field."
          )
  
      return simplified_nq_example["document_text"].split(" ")
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_nq_tokens(simplified_nq_example) and returns: simplified_nq_example