class_docstr: Class which encapsulates common functionality between all frozen
  multivariate distributions.
code: def random_state(self):
      return self._dist._random_state
  
imports: import numpy
  import scipy.linalg
  from scipy._lib import doccer
  from scipy.special import gammaln
  from scipy._lib._util import check_random_state
  from scipy.stats import mvn
label_desc: Use image node_id 1 for calling the multi_rv_frozen obj's underlying member method code with example usage: obj.random_state() and returns: self