Version with Noam's decay scheme.

def slicenet_params1_noam():
  """Version with Noam's decay scheme."""
  hparams = slicenet_params1()
  hparams.learning_rate_decay_scheme = "noam"
  hparams.learning_rate = 1.0
  hparams.learning_rate_warmup_steps = 4000
  hparams.initializer = "uniform_unit_scaling"
  hparams.optimizer_adam_epsilon = 1e-9
  hparams.optimizer_adam_beta1 = 0.9
  hparams.optimizer_adam_beta2 = 0.98
  return hparams