code: def test_offsets(self):
      self.assertClose(self.results_cpu[2].shape, offsets.shape, atol=0)
      self.assertClose(self.results_cpu[2], offsets, atol=0)
  
      # Offsets should be independent of input_size.
      self.assertClose(
          self.results_cpu[2], self.results1_cpu[2], atol=0
      )
  
imports: import unittest
  import torch
  from pytorch3d.common.compat import meshgrid_ij
  from pytorch3d.renderer.cameras import FoVPerspectiveCameras
  from pytorch3d.renderer.splatter_blend import _compute_occlusion_layers, _compute_splatted_colors_and_weights, _compute_splatting_colors_and_weights, _get_splat_kernel_normalization, _normalize_and_compose_all_layers, _offset_splats, _precompute, _prepare_pixels_and_colors
  from .common_testing import TestCaseMixin
label_desc: Use image node_id 2 for calling the TestPrecompute obj's underlying member method code with example usage: obj.test_offsets() without return types