docstr: Sets the parameters to initiate the MCMC run. Note that the parameters must
  have unconstrained support.
code: def initial_params(self, params):
      """
      Sets the parameters to initiate the MCMC run. Note that the parameters must
      have unconstrained support.
      """
      raise NotImplementedError
  
file_path: pyro/pyro/infer/mcmc/mcmc_kernel.py
imports: from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 7 for calling the MCMCKernel obj's underlying member method code with example usage: obj.initial_params(params) without return types