code: def _to_ipv6(ip: Optional[_BaseAddress]) -> Optional[IPv6Address]:
      if isinstance(ip, IPv6Address):
          return ip
      if isinstance(ip, IPv4Address):
          return IPv6Address("::ffff:" + str(ip))
      return None
  
imports: import csv
  import hashlib
  import logging
  import tempfile
  import time
  from ipaddress import IPv4Address, IPv6Address, _BaseAddress, ip_address
  from pathlib import Path
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import numpy
  import pandas
  from pandas.api.types import is_bool_dtype
  from pandas.api.types import is_datetime64_any_dtype
  from pandas.api.types import is_float_dtype, is_integer_dtype, is_numeric_dtype, is_string_dtype
  from pandas.core.dtypes.common import is_period_dtype
  from upgini.errors import ValidationError
  from upgini.http import ProgressStage, SearchProgress, get_rest_client
  from upgini.metadata import EVAL_SET_INDEX, SYSTEM_COLUMNS, SYSTEM_RECORD_ID, TARGET, DataType, FeaturesFilter, FileColumnMeaningType, FileColumnMetadata, FileMetadata, FileMetrics, ModelTaskType, NumericInterval, RuntimeParameters, SearchCustomization
  from upgini.normalizer.phone_normalizer import PhoneNormalizer
  from upgini.resource_bundle import bundle
  from upgini.sampler.random_under_sampler import RandomUnderSampler
  from upgini.search_task import SearchTask
  from upgini.utils import combine_search_keys
  from upgini.utils.email_utils import EmailSearchKeyConverter
  from upgini.utils.warning_counter import WarningCounter
label_desc: Use image node_id 19 for calling the Dataset obj's underlying member method code with example usage: obj._to_ipv6(ip) and returns: None, ip, IPv6Address