class_docstr: View for graph nodes at at high level.
class_docstr_tok: ["View","for","graph","nodes","at","at","high","level","."]
code: def __len__(self):
      return self._graph.get_node_num()
  
imports: from collections import namedtuple
  from typing import Any, List, Union
  import torch
  from .utils import slice_to_list
label_desc: Use image node_id 3 for calling the NodeView obj's underlying member method code with example usage: obj.__len__() and returns: self