class_docstr: The data view class when G.ndata[ntype] is called.
class_docstr_tok: ["The","data","view","class","when","G.ndata","[","ntype","]","is","called","."]
code: def __len__(self):
      return len(self._transpose())
  
imports: from __future__ import absolute_import
  from collections import defaultdict, namedtuple
  from collections.abc import MutableMapping
  from .None import backend
  from .base import ALL, DGLError
  from .frame import LazyFeature
label_desc: Use image node_id 6 for calling the HeteroNodeDataView obj's underlying member method code with example usage: obj.__len__() and returns: len