code: def test_half_log_det():
      import numpy as np
      from brainiak.reprsimil.brsa import BRSA
  
      a = np.asarray([[1, 0.2], [0.2, 1]])
      brsa = BRSA()
      half_log_det = np.log(np.linalg.det(a)) / 2
      assert np.isclose(
          half_log_det, brsa._half_log_det(a)
      ), "half log determinant function is wrong"
  
imports: import pytest
label_desc: Use image node_id 5 for calling a global function with example usage: test_half_log_det() without return types