code: def test_init(self):
      x = B(1.0)
      assert_(str(x) == "1.0")
      y = C(2.0)
      assert_(str(y) == "2.0")
      z = D(3.0)
      assert_(str(z) == "3.0")
  
imports: import functools
  from unittest import skipIf
  import pytest
  import torch._numpy
  from torch._numpy.testing import assert_
  from torch.testing._internal.common_utils import run_tests, TestCase
label_desc: Use image node_id 1 for calling the TestInherit obj's underlying member method code with example usage: obj.test_init() without return types