code: def preprocess_tsinghua_electricity(self):
      self.final_file_path = os.path.join(
          os.path.expanduser(self.path), "electricity.csv"
      )
      invalidInputError(
          os.path.exists(self.final_file_path),
          "tsinghua_electricity does not support automatic downloading, "
          "users should download manually from "
          "https://github.com/thuml/Autoformer#get-started and put to "
          f"{self.path}/electricity.csv",
      )
      self.df = pd.read_csv(self.final_file_path, parse_dates=["date"])
      return self
  
imports: import os
  import re
  import zipfile
  import tarfile
  import requests
  import logging
  import pandas
  import numpy
  from bigdl.chronos.data.tsdataset import TSDataset
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 9 for calling the PublicDataset obj's underlying member method code with example usage: obj.preprocess_tsinghua_electricity() and returns: self