code: def testEmptyFails(self):
      with ops.Graph().as_default() as g:
          with self.session(graph=g):
              x = array_ops.placeholder(dtypes.float32)
              with g.gradient_override_map({"Identity": "BadGrad"}):
                  y = array_ops.identity(x)
              bad = r"Empty gradient has wrong shape: expected \(0, 3\), got \(3, 0\)"
              with self.assertRaisesRegex(ValueError, bad):
                  gradient_checker.compute_gradient(
                      x, (0, 3), y, (0, 3)
                  )
              with self.assertRaisesRegex(ValueError, bad):
                  gradient_checker.compute_gradient_error(
                      x, (0, 3), y, (0, 3)
                  )
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  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 math_ops
  from tensorflow.python.ops import nn_ops
  import tensorflow.python.ops.nn_grad
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 9 for calling the GradientCheckerTest obj's underlying member method code with example usage: obj.testEmptyFails() without return types