code: def _tile_ref(
      ref: state.AbstractRef, block_shape: tuple[int, ...] | None
  ) -> state.AbstractRef:
      if block_shape is None:
          return ref
      shape = tuple(s for s in block_shape if s is not None)
      return state.shaped_array_ref(shape, ref.dtype)
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  import contextlib
  import dataclasses
  import functools
  from typing import Any, Callable
  from collections.abc import Iterator
  from jax._src import api_util
  from jax._src import core
  from jax._src import linear_util
  from jax._src import state
  from jax._src import tree_util
  from jax._src import util
  from jax._src.interpreters import partial_eval
  from jax._src.state import discharge
  import jax.numpy
label_desc: Use image node_id 5 for calling a global function with example usage: _tile_ref(ref, block_shape) and returns: state, ref