code: def testDirectInPlace(self):
      operators = [
          CreateOperator("Direct", "in", "in"),
          CreateOperator("Direct", "in", "out"),
      ]
      desired_grad_operators = [
          CreateOperator("DirectGradient", "out_grad", "in_grad"),
          CreateOperator("DirectGradient", "in_grad", "in_grad"),
      ]
      gradients, _ = GradientRegistry.GetBackwardPass(
          operators, {"out": "out_grad"}
      )
      self.assertOperatorListEqual(gradients, desired_grad_operators)
  
imports: from hypothesis import given, settings
  import hypothesis.strategies
  import unittest
  from caffe2.proto import caffe2_pb2
  from caffe2.python import core, test_util, workspace
  from caffe2.python.core import CreateOperator, GradientRegistry, IR
  import numpy
label_desc: Use image node_id 6 for calling the TestGradientCalculation obj's underlying member method code with example usage: obj.testDirectInPlace() without return types