code: def testExample3(self):
      inputs = [[[2, 4, 1], [5, -3, 6]], [[7, 9, -8], [9, 0, 4]]]
      self._validateNthElement(
          inputs, dtypes.int32, 0, False, [[1, -3], [-8, 0]]
      )
      self._validateNthElement(
          inputs, dtypes.int64, 0, True, [[4, 6], [9, 9]]
      )
  
imports: import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import nn_ops
  import tensorflow.python.ops.nn_grad
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the NthElementTest obj's underlying member method code with example usage: obj.testExample3() without return types