message: TPUEstimator: Switch to the core version of RunConfig.
diff: @@ -21,7 +21,7 @@ from __future__ import print_function
  import collections
  -from tensorflow.contrib.learn.python.learn.estimators import run_config as run_config_lib
  +from tensorflow.python.estimator import run_config as run_config_lib
  class TPUConfig(
  @@ -70,9 +70,20 @@ class TPUConfig(
  class RunConfig(run_config_lib.RunConfig):
  """RunConfig with TPU support."""
  - def __init__(self, tpu_config=None, **kwargs):
  + def __init__(self, tpu_config=None, evaluation_master='', master='',
  + **kwargs):
  super(RunConfig, self).__init__(**kwargs)
  self._tpu_config = tpu_config or TPUConfig()
  + self._evaluation_master = evaluation_master
  + self._master = master
  +
  + @property
  + def evaluation_master(self):
  + return self._evaluation_master
  +
  + @property
  + def master(self):
  + return self._master
  @property
  def tpu_config(self):
  