code: def sanitize_index(data, index, copy=False):
      """
      Sanitize an index type to return an ndarray of the underlying, pass
      through a non-Index.
      """
  
      if index is None:
          return data
  
      if len(data) != len(index):
          raise ValueError(
              "Length of values does not match length of index"
          )
  
      if isinstance(data, ABCIndexClass) and not copy:
          pass
      elif isinstance(data, (ABCPeriodIndex, ABCDatetimeIndex)):
          data = data._values
          if copy:
              data = data.copy()
  
      elif isinstance(data, np.ndarray):
          # coerce datetimelike types
          if data.dtype.kind in ["M", "m"]:
              data = sanitize_array(data, index, copy=copy)
  
      return data
  
imports: from collections import OrderedDict
  import numpy
  import numpy.ma
  from pandas._libs import lib
  from pandas._libs.tslibs import IncompatibleFrequency
  import pandas.compat
  from pandas.compat import get_range_parameters, lmap, lrange, raise_with_traceback, range
  from pandas.core.dtypes.cast import construct_1d_arraylike_from_scalar, construct_1d_ndarray_preserving_na, construct_1d_object_array_from_listlike, infer_dtype_from_scalar, maybe_cast_to_datetime, maybe_cast_to_integer_array, maybe_castable, maybe_convert_platform, maybe_infer_to_datetimelike, maybe_upcast
  from pandas.core.dtypes.common import is_categorical_dtype, is_datetime64tz_dtype, is_dtype_equal, is_extension_array_dtype, is_extension_type, is_float_dtype, is_integer_dtype, is_iterator, is_list_like, is_object_dtype, pandas_dtype
  from pandas.core.dtypes.generic import ABCDataFrame, ABCDatetimeIndex, ABCIndexClass, ABCPandasArray, ABCPeriodIndex, ABCSeries, ABCTimedeltaIndex
  from pandas.core.dtypes.missing import isna
  from pandas.core import algorithms, common
  from pandas.core.arrays import Categorical, ExtensionArray, period_array
  from pandas.core.index import Index, _get_objs_combined_axis, _union_indexes, ensure_index
  from pandas.core.indexes import base
  from pandas.core.internals import create_block_manager_from_arrays, create_block_manager_from_blocks
  from pandas.core.internals.arrays import extract_array
label_desc: Use image node_id 16 for calling a global function with example usage: sanitize_index(data, index, copy) and returns: data, data