code: def compute_index(self, *args):
      assert self.index_map is not None
      assert self.block_shape is not None
      out = self.index_map(*args)
      if not isinstance(out, tuple):
          out = (out,)
      return out
  
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 2 for calling the BlockSpec obj's underlying member method code with example usage: obj.compute_index() and returns: out