class_docstr: Pack the wildreceipt annotation to MMOCR format.
  
  Args:
      merge_bg_others (bool): If True, give the same label to "background"
              class and "others" class. Defaults to True.
      ignore_idx (int): Index for ``ignore`` class. Defaults to 0.
      others_idx (int): Index for ``others`` class. Defaults to 25.
docstr: No meta info is required for the wildreceipt dataset.
code: def add_meta(self, samples: List) -> List:
      """No meta info is required for the wildreceipt dataset."""
      return samples
  
file_path: mmocr/mmocr/datasets/preparers/packers/wildreceipt_packer.py
imports: import json
  from typing import List
  from mmocr.registry import DATA_PACKERS
  from .base import BasePacker
label_desc: Use image node_id 2 for calling the WildReceiptPacker obj's underlying member method code with example usage: obj.add_meta(samples) and returns: samples