code: def _Elog(self, _ID=slice(None)):
      return torch.digamma(self._posterior(_ID)) - torch.digamma(
          self.posterior_sum.unsqueeze(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 4 for calling the _Dirichlet obj's underlying member method code with example usage: obj._Elog(_ID) and returns: unknown