code: def is_feature_store_on_cuda(store):
      for feature in store._features.values():
          assert feature._tensor.is_cuda
  
imports: import os
  import tempfile
  import unittest
  from functools import reduce
  from operator import mul
  import backend
  import numpy
  import pydantic
  import pytest
  import torch
  from dgl import graphbolt
label_desc: Use image node_id 4 for calling a global function with example usage: is_feature_store_on_cuda(store) without return types