docstr: Test one forward of VoxelGridImplicitFunction.
docstr_tok: ["Test","one","forward","of","VoxelGridImplicitFunction","."]
code: def test_forward(self) -> None:
      """
      Test one forward of VoxelGridImplicitFunction.
      """
      func = self._get_simple_implicit_function()
  
      n_grids, n_points = 10, 9
      raybundle = ImplicitronRayBundle(
          origins=torch.randn(n_grids, 2, 3, 3),
          directions=torch.randn(n_grids, 2, 3, 3),
          lengths=torch.randn(n_grids, 2, 3, n_points),
          xys=0,
      )
      func(raybundle)
  
file_path: pytorch3d/tests/implicitron/test_voxel_grid_implicit_function.py
imports: import unittest
  import torch
  from omegaconf import DictConfig, OmegaConf
  from pytorch3d.implicitron.models.implicit_function.voxel_grid_implicit_function import VoxelGridImplicitFunction
  from pytorch3d.implicitron.models.renderer.base import ImplicitronRayBundle
  from pytorch3d.implicitron.tools.config import expand_args_fields, get_default_args
  from pytorch3d.renderer import ray_bundle_to_ray_points
  from tests.common_testing import TestCaseMixin
label_desc: Use image node_id 3 for calling the TestVoxelGridImplicitFunction obj's underlying member method code with example usage: obj.test_forward() without return types