code: def test_cuda(self):
      device = get_random_cuda_device()
      self._simple_alphacomposite(alpha_composite, device)
      self._simple_wsum(weighted_sum, device)
      self._simple_wsumnorm(norm_weighted_sum, device)
  
file_path: pytorch3d/tests/test_compositing.py
imports: import unittest
  import torch
  from pytorch3d.renderer.compositing import alpha_composite, norm_weighted_sum, weighted_sum
  from .common_testing import get_random_cuda_device, TestCaseMixin
label_desc: Use image node_id 6 for calling the TestAccumulatePoints obj's underlying member method code with example usage: obj.test_cuda() without return types