class_docstr: Gradient-checking for ExtractImagePatches op.
code: def test_BHWC_Gradient(self):
      self._VariableShapeGradient([-1, -1, -1, -1])
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.eager.polymorphic_function import polymorphic_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import random_seed
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 6 for calling the ExtractImagePatchesGradTest obj's underlying member method code with example usage: obj.test_BHWC_Gradient() without return types