class_docstr: Map container of MXNet.
  
  You do not need to create Map explicitly.
  Normally python dict will be converted automaticall to Map during mxnet function call.
  You can use convert to create a dict[Object-> Object] into a Map
class_docstr_tok: ["Map","container","of","MXNet",".","You","do","not","need","to","create","Map","explicitly",".","Normally","python","dict","will","be","converted","automaticall","to","Map","during","mxnet","function","call",".","You","can","use","convert","to","create","a","dict","[","Object-",">","Object","]","into","a","Map"]
code: def __len__(self):
      return _MapSize(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 Map obj's underlying member method code with example usage: obj.__len__() and returns: _MapSize