code: def __repr__(self):
      return "<unspecified>"
  
file_path: chainer/chainer/memory_layouts.py
imports: import chainer
  from chainer import function_node
  from chainer.utils import type_check
label_desc: Use image node_id 1 for calling the _Unspecified obj's underlying member method code with example usage: obj.__repr__() and returns: str