code: def _load_rule_sets(self) -> List[Replacement]:
      return [
          r.to_replacement()
          for r in sum(
              [parse_ruleset(r) for r in self.params.rulesets], []
          )
      ]
  
imports: import json
  import logging
  import re
  from dataclasses import dataclass, field
  from pathlib import Path
  from typing import List, Type, Optional, Dict, Tuple, Union, Callable
  from dataclasses_json import dataclass_json
  from paiargparse import pai_dataclass, pai_meta
  from tfaip.data.pipeline.processor.dataprocessor import DataProcessorParams
  from tfaip.util.enum import StrEnum
  from calamari_ocr import calamari_ocr_dir
  from calamari_ocr.ocr.dataset.textprocessors import TextProcessor
label_desc: Use image node_id 4 for calling the TextRegularizerProcessor obj's underlying member method code with example usage: obj._load_rule_sets() and returns: unknown