Small range of hyperparameters.

def vqa_attention_base_range(rhp):
  """Small range of hyperparameters."""
  # After starting from base, set intervals for some parameters.
  rhp.set_float("learning_rate", 0.1, 1.0, scale=rhp.LOG_SCALE)
  rhp.set_float("clip_grad_norm", 0.1, 10, scale=rhp.LOG_SCALE)
  rhp.set_discrete("batch_size", [128, 256, 512, 1024])
  rhp.set_float("weight_decay", 0.0, 1e-4)
  rhp.set_categorical("rnn_type", ["lstm", "lstm_layernorm"])