def get_eval_metric_values(events):
  """Filter TensorBoard events to only include those for eval metrics.

  Args:
    events: dict of list of (step, value) tuples where keys are tags.

  Returns:
    Dict where key is task_name/metric_name and value is (step, value) tuple.
  """
  eval_values = {}
  for tag, event_values in events.items():
    if tag.startswith("eval"):
      _, task_name, metric_name = tag.split("/")
      eval_values["{}/{}".format(task_name, metric_name)] = event_values
  return eval_values