message: Group update_ops before applying control dependency in Keras optimizer.
diff: @@ -639,7 +639,7 @@ class OptimizerV2(trackable.Trackable):
  # symbolic then the step update should be carried out under a graph
  # context. (eager updates execute immediately)
  with ops._get_graph_from_inputs(update_ops).as_default(): # pylint: disable=protected-access
  - with ops.control_dependencies(update_ops):
  + with ops.control_dependencies([control_flow_ops.group(update_ops)]):
  return self._iterations.assign_add(1, read_value=False)
  return self._iterations.assign_add(1)
  