class_docstr: 可以将形如 ``[1, 2, 3]`` 这类的数据转为 ``[1, 2, 3]`` 。实际上该 padder 无意义。
  
  :param pad_val:
  :param ele_dtype:
  :param dtype:
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code: def __call__(self, batch_field):
      return batch_field
  
file_path: fastNLP/fastNLP/core/collators/padders/raw_padder.py
imports: from .padder import Padder
  from .utils import is_number, get_padded_numpy_array, is_number_or_numpy_number
  from .exceptions import *
label_desc: Use image node_id 2 for calling the RawNumberPadder obj's underlying member method code with example usage: obj.__call__(batch_field) and returns: batch_field