code: def test_ball_query_vs_python_ragged_cuda(self):
      device = get_random_cuda_device()
      self._ball_query_vs_python_ragged_helper(device)
  
imports: import unittest
  from itertools import product
  import torch
  from pytorch3d.ops import sample_points_from_meshes
  from pytorch3d.ops.ball_query import ball_query
  from pytorch3d.ops.knn import _KNN
  from pytorch3d.utils import ico_sphere
  from .common_testing import get_random_cuda_device, TestCaseMixin
label_desc: Use image node_id 8 for calling the TestBallQuery obj's underlying member method code with example usage: obj.test_ball_query_vs_python_ragged_cuda() without return types