code: def get_src_tgt_len_ratio(
      self,
  ):
      pass
  
imports: from openprompt.data_utils.utils import InputExample
  import os
  import json, csv
  from abc import ABC, abstractmethod
  from collections import defaultdict, Counter
  from typing import List, Dict, Callable
  from openprompt.utils.logging import logger
  from openprompt.data_utils.data_processor import DataProcessor
  from tqdm import tqdm
label_desc: Use image node_id 3 for calling the UltraChatProcessor obj's underlying member method code with example usage: obj.get_src_tgt_len_ratio() without return types