code: def test_packed_matrix(self):
      output = example_test.run_example(
          "custom_struct/packed_matrix.py"
      )
      assert re.match(
          r"Kernel output matches expected value for type 'float'.\r?\n"
          r"Kernel output matches expected value for type 'double'.",
          output.decode("utf-8"),
      )
  
imports: import re
  import unittest
  from example_tests import example_test
label_desc: Use image node_id 2 for calling the TestCustomStruct obj's underlying member method code with example usage: obj.test_packed_matrix() without return types