Test out all the layers on local CPU.

def mtf_bitransformer_all_layers_tiny():
  """Test out all the layers on local CPU."""
  hparams = mtf_bitransformer_tiny()
  hparams.moe_num_experts = 4
  hparams.moe_expert_x = 4
  hparams.moe_expert_y = 4
  hparams.moe_hidden_size = 512
  hparams.encoder_layers = [
      "self_att", "local_self_att", "moe_1d", "moe_2d", "drd"]
  hparams.decoder_layers = [
      "self_att", "local_self_att", "enc_att", "moe_1d", "moe_2d", "drd"]
  return hparams