code: def test_base_df():
      """Test BaseDF. Checks that it doesn't raise errors."""
      from deepchem.utils.dft_utils import BaseDF
  
      class MyDF(BaseDF):
          def __init__(self):
              super(MyDF, self).__init__()
  
          def get_j2c(self):
              return torch.ones((3, 3))
  
          def get_j3c(self):
              return torch.ones((3, 3, 3))
  
      df = MyDF()
      assert torch.allclose(df.get_j2c(), torch.ones((3, 3)))
      assert torch.allclose(df.get_j3c(), torch.ones((3, 3, 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 12 for calling a global function with example usage: test_base_df() and returns: torch, torch