code: def file_format(self, tree):
      file_format = None
      file_format_string = tree.children[0]
  
      if file_format_string == "VIDEO":
          file_format = FileFormatType.VIDEO
      elif file_format_string == "CSV":
          file_format = FileFormatType.CSV
      elif file_format_string == "IMAGE":
          file_format = FileFormatType.IMAGE
      elif file_format_string == "DOCUMENT":
          file_format = FileFormatType.DOCUMENT
      elif file_format_string == "PDF":
          file_format = FileFormatType.PDF
  
      return file_format
  
imports: from lark.tree import Tree
  from evadb.parser.load_statement import LoadDataStatement
  from evadb.parser.types import FileFormatType
label_desc: Use image node_id 2 for calling the Load obj's underlying member method code with example usage: obj.file_format(tree) and returns: file_format