class_docstr: Augmenter that replaces letters with similar mappings
code: def get_mapping(self, mapping_path: Optional[str]) -> CharReplacement:
      return CharReplacement(mapping_path)
  
file_path: AugLy/augly/text/augmenters/letter_replacement.py
imports: import json
  from typing import List, Optional
  from augly.text.augmenters.utils import get_aug_idxes, LETTER_CHAR_MAPPING, rejoin_words_and_whitespace, split_words_on_whitespace, validate_augmenter_params
  from augly.utils import pathmgr
  from augly.utils.libsndfile import install_libsndfile
  from nlpaug.augmenter.char import CharAugmenter
  from nlpaug.util import Action, Method
label_desc: Use image node_id 2 for calling the LetterReplacementAugmenter obj's underlying member method code with example usage: obj.get_mapping(mapping_path) and returns: CharReplacement