class_docstr: A small serializable object to wrap literal values without copying.
code: def __init__(self, data):
      self.data = data
  
imports: from collections import defaultdict
  from typing import List, Sequence
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 1 to create a new literal object  with example: obj = literal(data)