Allow TF_CONFIG when remote_cluster is specified in distribute coordinator's utility for estimator.

PiperOrigin-RevId: 210666455

Author: Yuefeng Zhou

tensorflow/python/distribute/estimator_training.py

@@ -147,8 +147,8 @@ def init_run_config(config, tf_config):
   # `experimental_distribute.remote_cluster` is set.
   if (config._train_distribute and config._experimental_distribute and
       config._experimental_distribute.remote_cluster):
-    if tf_config:
-      raise ValueError('Cannot set both TF_CONFIG environment variable and '
+    if cluster_spec:
+      raise ValueError('Cannot set both "cluster_spec" of TF_CONFIG and '
                        '`experimental_distribute.remote_cluster`')
     config._distribute_coordinator_mode = dc.CoordinatorMode.STANDALONE_CLIENT
     config._cluster_spec = config._experimental_distribute.remote_cluster