code: def calc_pos(fancy_index_shape, pos, xp=np):
      if isinstance(pos, dict):
          pos = xp.concatenate(list(pos.values()))
      select_pos = xp.empty(fancy_index_shape, dtype=int)
      select_pos.flat[pos] = xp.arange(select_pos.size)
      return select_pos
  
imports: import inspect
  import itertools
  import operator
  from collections import OrderedDict
  from collections.abc import Iterable
  from functools import lru_cache, reduce, wraps
  from math import ceil
  from numbers import Integral
  from typing import Dict, List, Union
  import numpy
  from ..core import ExecutableTuple, recursive_tile
  from ..utils import lazy_import
  from ..lib.mmh3 import hash_from_buffer
label_desc: Use image node_id 18 for calling a global function with example usage: calc_pos(fancy_index_shape, pos, xp) and returns: select_pos