code: def test_diag_action(self, diagonal_vec, point, expected, atol):
      res = self.space.diag_action(diagonal_vec, point)
      self.assertAllClose(res, expected, atol=atol)
  
file_path: geomstats/geomstats/test_cases/geometry/full_rank_correlation_matrices.py
imports: import pytest
  import geomstats.backend
  from geomstats.geometry.matrices import Matrices
  from geomstats.test.vectorization import generate_vectorization_data
  from geomstats.test_cases.geometry.base import LevelSetTestCase
label_desc: Use image node_id 4 for calling the FullRankCorrelationMatricesTestCase obj's underlying member method code with example usage: obj.test_diag_action(diagonal_vec, point, expected, atol) without return types