code: def file_parser(self) -> Optional[FileParserBlock]:
      return self.try_get_previous(FileParserBlock)
  
imports: import numpy
  from typing import Any
  from typing import Dict
  from typing import Tuple
  from typing import Optional
  from dataclasses import dataclass
  from cftool.misc import print_warning
  from .file import FileParserBlock
  from ....schema import DataTypes
  from ....schema import DataBundle
  from ....schema import ColumnTypes
  from ....schema import INoInitDataBlock
label_desc: Use image node_id 4 for calling the RecognizerBlock obj's underlying member method code with example usage: obj.file_parser() and returns: self