class_docstr: wrapper of abstrcat Frontend
docstr: call 
code: def __call__(self, *args, **kwargs):
      """call"""
      return self.call(*args, **kwargs)
  
file_path: delta/delta/data/frontend/base_frontend.py
imports: import abc
  import delta.compat
  from delta.utils.hparam import HParams
label_desc: Use image node_id 4 for calling the BaseFrontend obj's underlying member method code with example usage: obj.__call__() and returns: self