code: def test_choose_grid_size(self):
      """ """
      x = torch.randn(100)
      grid_size = gpytorch.utils.grid.choose_grid_size(x, ratio=2.0)
      self.assertEqual(grid_size, 200)
  
      x = torch.randn(100, 1)
      grid_size = gpytorch.utils.grid.choose_grid_size(x, ratio=2.0)
      self.assertEqual(grid_size, 200)
  
      x = torch.randn(10000, 2)
      grid_size = gpytorch.utils.grid.choose_grid_size(x, ratio=2.0)
      self.assertEqual(grid_size, 200)
  
      x = torch.randn(16, 10000, 4)
      grid_size = gpytorch.utils.grid.choose_grid_size(x, ratio=2.0)
      self.assertEqual(grid_size, 20)
  
imports: import unittest
  import torch
  import gpytorch
label_desc: Use image node_id 2 for calling the TestGrid obj's underlying member method code with example usage: obj.test_choose_grid_size() without return types