code: def prior_logp(self, z):
      raise NotImplementedError(
          "prior_logp for OU SDE not yet implemented!"
      )
  
imports: import abc
  import warnings
  import numpy
  import torch
label_desc: Use image node_id 9 for calling the OUVESDE obj's underlying member method code with example usage: obj.prior_logp(z) without return types