code: def test_neighbour_found_under_random_sampling(self):
      random_sphere = RandomSphere(0.1, strategy="RANDOM")
      data = random_sphere(self.data.clone())
      assert data.labels.shape[0] == 1
  
      random_sphere = RandomSphere(3, strategy="RANDOM")
      data = random_sphere(self.data.clone())
      assert data.labels.shape[0] == 6
  
file_path: torch-points3d/test/test_sphere_sampling.py
imports: import os
  import sys
  import unittest
  import numpy
  import torch
  from torch_geometric.data import Data
  from torch_points3d.core.data_transform.transforms import RandomSphere, SphereSampling
label_desc: Use image node_id 2 for calling the TestRandomSphere obj's underlying member method code with example usage: obj.test_neighbour_found_under_random_sampling() without return types