Basic LSTM Params.

def lstm_asr_v1():
  """Basic LSTM Params."""
  hparams = lstm_bahdanau_attention()
  hparams.num_hidden_layers = 2
  hparams.hidden_size = 256
  hparams.batch_size = 36
  hparams.max_input_seq_length = 600000
  hparams.max_target_seq_length = 350
  hparams.max_length = hparams.max_input_seq_length
  hparams.min_length_bucket = hparams.max_input_seq_length // 2
  hparams.learning_rate = 0.05
  return hparams