code: def test_matrix_from_vector(self, vec, expected, atol):
      mat = self.space.matrix_from_vector(vec)
      self.assertAllClose(mat, expected, atol=atol)
  
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.euclidean import Euclidean
  from geomstats.geometry.general_linear import SquareMatrices
  from geomstats.geometry.special_euclidean import SpecialEuclidean, homogeneous_representation
  from geomstats.test.random import LieGroupVectorRandomDataGenerator
  from geomstats.test.test_case import assert_allclose
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.lie_group import LieGroupTestCase
  from geomstats.test_cases.geometry.mixins import ProjectionTestCaseMixins
label_desc: Use image node_id 2 for calling the SpecialEuclideanVectorsTestCase obj's underlying member method code with example usage: obj.test_matrix_from_vector(vec, expected, atol) without return types