class_docstr: Algebatic data type(ADT) object.
  
  Parameters
  ----------
  tag : int
      The tag of ADT.
  
  fields : list[Object] or tuple[Object]
      The source tuple.
class_docstr_tok: ["Algebatic","data","type","(","ADT",")","object",".","Parameters","--","--","--","--","--","tag",":","int","The","tag","of","ADT",".","fields",":","list","[","Object","]","or","tuple","[","Object","]","The","source","tuple","."]
code: def __len__(self):
      return _GetADTSize(self)
  
file_path: mxnet/python/mxnet/container.py
imports: from ._ffi.object import Object, register_object, getitem_helper, PyNativeObject
  from ._ffi.function import _init_api
label_desc: Use image node_id 4 for calling the ADT obj's underlying member method code with example usage: obj.__len__() and returns: _GetADTSize