code: def test_product2():
      O_1 = random_orth(names="xyz")
      O_2 = random_orth(names="xyz")
      O_21 = MG.product(O_2, O_1)
  
file_path: nipy/nipy/core/reference/tests/test_matrix_groups.py
imports: import numpy
  import pytest
  from scipy.linalg import expm
  import nipy.core.reference.tests.matrix_groups
  from nipy.core.api import ArrayCoordMap
label_desc: Use image node_id 6 for calling a global function with example usage: test_product2() without return types