docstr: Relevant logging information to be printed at regular intervals
  of the MCMC run. Returns `None` by default.
  
  :return: String containing the diagnostic summary. e.g. acceptance rate
  :rtype: string
code: def logging(self):
      """
      Relevant logging information to be printed at regular intervals
      of the MCMC run. Returns `None` by default.
  
      :return: String containing the diagnostic summary. e.g. acceptance rate
      :rtype: string
      """
      return None
  
file_path: pyro/pyro/infer/mcmc/mcmc_kernel.py
imports: from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 3 for calling the MCMCKernel obj's underlying member method code with example usage: obj.logging() and returns: None