Remove empty arg/kwargs from es_trainer_lib

This just passed empty strings which meant that implemented workers needed to
accept these arguments for no reason. We should not be passing any arguments
and let all the configuration on the worker side happen through gin.

Reviewers: mtrofin

Reviewed By: mtrofin

Pull Request: #432

Author: boomanaiden154

compiler_opt/es/es_trainer_lib.py

@@ -215,8 +215,7 @@ def train(additional_compilation_flags=(),
                learner_config.total_steps)
 
   with local_worker_manager.LocalWorkerPoolManager(
-      worker_class, learner_config.total_num_perturbations, arg="",
-      kwarg="") as pool:
+      worker_class, learner_config.total_num_perturbations) as pool:
     for _ in range(learner_config.total_steps):
       learner.run_step(pool)