code: def __call__(self, id):
      return self.callback(id)
  
file_path: CNTK/bindings/python/cntk/internal/__init__.py
imports: from .swig_helper import typemap, map_if_possible
  from .sanitize import *
  from .sanitize import _as_tuple
  import cntk
label_desc: Use image node_id 2 for calling the _DeserializerFactory obj's underlying member method code with example usage: obj.__call__(id) and returns: self