message: Remove duplicate Optimizer combinations.
diff: @@ -137,9 +137,6 @@ optimizers_v1_and_v2 = optimizers_v1 + optimizers_v2
  graph_and_eager_modes = ["graph", "eager"]
  -optimizers_v1_and_v2 = optimizers_v1 + optimizers_v2
  -
  -
  def distributions_and_v1_optimizers():
  """A common set of combination with DistributionStrategies and Optimizers."""
  return combinations.combine(
  