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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def read_from_json(json_filename):
 """Read JSON-formatted proto into DatasetInfo proto."""

  with tf.io.gfile.GFile(json_filename) as f:
    dataset_info_json_str = f.read()
  # Parse it back into a proto.
  parsed_proto = json_format.Parse(dataset_info_json_str,
                                   dataset_info_pb2.DatasetInfo())
  return parsed_proto