code: def ratings_csv_to_dataframe(data_dir, dataset):
      with tf.io.gfile.GFile(
          os.path.join(data_dir, dataset, RATINGS_FILE)
      ) as f:
          return pd.read_csv(f, encoding="utf-8")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import sys
  import tempfile
  import zipfile
  import numpy
  import pandas
  import six
  from six.moves import urllib
  from absl import app
  from absl import flags
  from absl import logging
  import tensorflow
  from utils.flags import core
label_desc: Use image node_id 6 for calling a global function with example usage: ratings_csv_to_dataframe(data_dir, dataset) and returns: pd