code: def count_models(self):
      return len(self.data101_from_zerocost)
  
imports: import os
  import random
  from src.common.constant import Config
  from src.tools.io_tools import read_json, write_json
  from src.query_api.singleton import Singleton
  from src.tools.io_tools import read_pickle
  from src.tools.compute import generate_global_rank
label_desc: Use image node_id 4 for calling the Gt101 obj's underlying member method code with example usage: obj.count_models() and returns: len