code: def _read_only(self):
      if os.path.exists(self.state_pkl):
          fh = open(self.state_pkl, "rb")
          state = pickle.load(fh)
          fh.close()
  
          self.D = state["dims"]
          self.ls = state["ls"]
          self.amp2 = state["amp2"]
          self.noise = state["noise"]
          self.mean = state["mean"]
          self.hyper_samples = state["hyper_samples"]
          self.needs_burnin = False
          return True
  
      return False
  
imports: import os
  from ..None import gp
  import sys
  from ..None import util
  import tempfile
  import pickle
  import copy
  import numpy
  import numpy.random
  import scipy.linalg
  import scipy.stats
  import scipy.optimize
  import multiprocessing
  from ..helpers import *
  from ..Locker import *
  import logging
label_desc: Use image node_id 4 for calling the GPEIOptChooser obj's underlying member method code with example usage: obj._read_only() and returns: False, True