Convert list elements to laid-out-tensors when possible.

  Args:
    xs: a list
  Returns:
    a list

def convert_args_to_laid_out_tensors(xs):
  """Convert list elements to laid-out-tensors when possible.

  Args:
    xs: a list
  Returns:
    a list
  """
  ret = []
  for x in xs:
    if hasattr(x, "to_laid_out_tensor"):
      ret.append(x.to_laid_out_tensor())
    else:
      ret.append(x)
  return ret