docstr: Samples parameters from the posterior distribution, when given existing parameters.
  
  :param dict params: Current parameter values.
  :param int time_step: Current time step.
  :return: New parameters from the posterior distribution.
code: def sample(self, params):
      """
      Samples parameters from the posterior distribution, when given existing parameters.
  
      :param dict params: Current parameter values.
      :param int time_step: Current time step.
      :return: New parameters from the posterior distribution.
      """
      raise NotImplementedError
  
file_path: pyro/pyro/infer/mcmc/mcmc_kernel.py
imports: from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 8 for calling the MCMCKernel obj's underlying member method code with example usage: obj.sample(params) without return types