code: def setUp(self):
      self.model = MockModel()
  
imports: import unittest
  import numpy
  import numpy.testing
  import torch
  import os
  import sys
  from collections import defaultdict
  from omegaconf import DictConfig
  from torch_points3d.models.base_model import BaseModel, BaseInternalLossModule
  from torch_points3d.modules.PointNet.modules import PointNetSTN3D
label_desc: Use image node_id 1 for calling the TestInternalLosses obj's underlying member method code with example usage: obj.setUp() without return types