code: def is_in_valid_multiindex_types(x) -> bool:
      """Check that the input type belongs to the valid multiindex types."""
      return isinstance(x, VALID_MULTIINDEX_TYPES) or is_integer_index(
          x
      )
  
file_path: sktime/sktime/datatypes/_panel/_check.py
imports: import numpy
  import pandas
  from pandas.core.dtypes.cast import is_nested_object
  from sktime.datatypes._common import _req, _ret
  from sktime.datatypes._series._check import _index_equally_spaced, check_pddataframe_series
  from sktime.utils.validation._dependencies import _check_soft_dependencies
  from sktime.utils.validation.series import is_in_valid_index_types, is_integer_index
label_desc: Use image node_id 1 for calling a global function with example usage: is_in_valid_multiindex_types(x) and returns: unknown