class_docstr: Class for loading data with batches 
class_docstr_tok: ["Class","for","loading","data","with","batches"]
code: def extract(self) -> pd.DataFrame:
      pass
  
imports: import glob
  import json
  import os
  from abc import ABC, abstractmethod
  import pandas
label_desc: Use image node_id 2 for calling the BatchLoader obj's underlying member method code with example usage: obj.extract() without return types