HParams for parsing on WSJ only.

def transformer_parsing_base():
  """HParams for parsing on WSJ only."""
  hparams = transformer_base()
  hparams.attention_dropout = 0.2
  hparams.layer_prepostprocess_dropout = 0.2
  hparams.max_length = 512
  hparams.learning_rate_warmup_steps = 16000
  hparams.hidden_size = 1024
  hparams.learning_rate = 0.05
  hparams.shared_embedding_and_softmax_weights = False
  return hparams