code: def init_mesh(self) -> Meshes:
      V, F = 32, 64
      device = get_random_cuda_device()
      # random vertices
      verts = torch.rand((V, 3), dtype=torch.float32, device=device)
      # random valid faces (no self circles, e.g. (v0, v0, v1))
      faces = torch.stack([torch.randperm(V) for f in range(F)], dim=0)[
          :, :3
      ]
      faces = faces.to(device=device)
      return Meshes(verts=[verts], faces=[faces])
  
file_path: pytorch3d/tests/test_laplacian_matrices.py
imports: import unittest
  import torch
  from pytorch3d.ops import cot_laplacian, laplacian, norm_laplacian
  from pytorch3d.structures.meshes import Meshes
  from .common_testing import get_random_cuda_device, TestCaseMixin
label_desc: Use image node_id 2 for calling the TestLaplacianMatrices obj's underlying member method code with example usage: obj.init_mesh() and returns: Meshes