code: def _run(self, train_op, sess):
      sess.run(train_op)
  
imports: import time
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import indexed_slices
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework.test_util import create_local_cluster
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.platform import test
  from tensorflow.python.training import adam
  from tensorflow.python.training import gradient_descent
  from tensorflow.python.training import training
label_desc: Use image node_id 1 for calling the SyncReplicasOptimizerTest obj's underlying member method code with example usage: obj._run(train_op, sess) without return types