code: def test_vector_custom():
      from pybind11_tests import El, VectorEl, VectorVectorEl
  
      v_a = VectorEl()
      v_a.append(El(1))
      v_a.append(El(2))
      assert str(v_a) == "VectorEl[El{1}, El{2}]"
  
      vv_a = VectorVectorEl()
      vv_a.append(v_a)
      vv_b = vv_a[0]
      assert str(vv_b) == "VectorEl[El{1}, El{2}]"
  
file_path: turicreate/src/external/coremltools_wrap/coremltools/deps/pybind11/tests/test_stl_binders.py
label_desc: Use image node_id 2 for calling a global function with example usage: test_vector_custom() without return types