code: def n(self):
      return self.nphi.sum(1)
  
imports: import collections
  import functools
  import io
  import os
  import warnings
  import dgl
  import numpy
  import scipy
  import torch
label_desc: Use image node_id 6 for calling the _Dirichlet obj's underlying member method code with example usage: obj.n() and returns: self