code: def _ensure_index(x: Any) -> int | tuple[int, ...]:
      """Ensure x is either an index or a tuple of indices."""
      x = core.concrete_or_error(
          None, x, "expected a static index or sequence of indices."
      )
      try:
          return operator.index(x)
      except TypeError:
          return tuple(map(operator.index, x))
  
imports: from __future__ import annotations
  from collections.abc import Iterable, Sequence
  import inspect
  import operator
  from functools import partial
  from typing import Any, Callable
  import warnings
  import numpy
  from jax._src import core
  from jax._src import dtypes
  from jax._src.abstract_arrays import numpy_scalar_types
  from jax._src.core import ShapedArray
  from jax._src.tree_util import PyTreeDef, tree_flatten, tree_unflatten, tree_map, tree_structure, treedef_children, generate_key_paths, keystr, broadcast_prefix, prefix_errors
  from jax._src.tree_util import _replace_nones
  from jax._src import linear_util
  from jax._src.linear_util import TracingDebugInfo
  from jax._src.util import safe_map, WrapKwArgs, Hashable, HashableFunction, Unhashable
  from jax._src import traceback_util
label_desc: Use image node_id 1 for calling a global function with example usage: _ensure_index(x) and returns: operator, tuple