code: def test_base_grid():
      import torch
      from deepchem.utils.dft_utils import BaseGrid
  
      class Grid(BaseGrid):
          def __init__(self):
              super(Grid, self).__init__()
              self.ngrid = 10
              self.ndim = 3
              self.dvolume = torch.ones(self.ngrid)
              self.rgrid = torch.ones((self.ngrid, self.ndim))
  
          def get_dvolume(self):
              return self.dvolume
  
          def get_rgrid(self):
              return self.rgrid
  
      grid = Grid()
      assert torch.allclose(grid.get_dvolume(), torch.ones(10))
      assert torch.allclose(grid.get_rgrid(), torch.ones((10, 3)))
  
file_path: deepchem/deepchem/utils/test/test_dft_utils.py
imports: import pytest
  import numpy
  from typing import Union
label_desc: Use image node_id 11 for calling a global function with example usage: test_base_grid() and returns: self, self