Hyperparameters for tuning revnet.

def revnet_range(rhp):
  """Hyperparameters for tuning revnet."""
  rhp.set_float('learning_rate', 0.05, 0.2, scale=rhp.LOG_SCALE)
  rhp.set_float('weight_decay', 1e-5, 1e-3, scale=rhp.LOG_SCALE)
  rhp.set_discrete('num_channels_init_block', [64, 128])
  return rhp