class_docstr: Tests for ops in horovod.tensorflow that add/remove process sets after initialization.
docstr: Prevent that one process shuts down Horovod too early
docstr_tok: ["Prevent","that","one","process","shuts","down","Horovod","too","early"]
code: def tearDown(self):
      """Prevent that one process shuts down Horovod too early"""
      with tf.device("/cpu:0"):
          b = hvd.allreduce(
              tf.constant([0.0]), name="global_barrier_after_test"
          )
          _ = self.evaluate(b)
  
file_path: horovod/test/parallel/test_tensorflow_process_sets_dynamic.py
imports: import tensorflow
  import horovod.tensorflow
  from base_test_tensorflow import *
label_desc: Use image node_id 2 for calling the TensorFlowProcessSetsDynamicTests obj's underlying member method code with example usage: obj.tearDown() without return types