code: def setUp(self):
      matrix = np.asarray([[4, 1], [2, 10]])
      self._confusion = ConfusionMatrix.create_from_matrix(matrix)
  
file_path: torch-points3d/test/test_confusionMatrix.py
imports: import os
  import sys
  import numpy
  import unittest
  import tempfile
  import h5py
  import numpy.testing
  import numpy.matlib
  from torch_points3d.metrics.confusion_matrix import ConfusionMatrix
label_desc: Use image node_id 1 for calling the TestConfusionMatrix obj's underlying member method code with example usage: obj.setUp() without return types