code: def test_slice_int64(self):
      x = constant_op.constant([1.0, 2.0, 3.0], dtype=dtypes.float64)
      begin = constant_op.constant([1], dtype=dtypes.int64)
      size = constant_op.constant([1], dtype=dtypes.int64)
  
      def f(x):
          return array_ops.slice(x, begin, size)
  
      self._testGrad(f, x)
  
imports: from tensorflow.python.eager import backprop
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gradient_checker_v2
  from tensorflow.python.platform import test
label_desc: Use image node_id 12 for calling the ArrayGradTest obj's underlying member method code with example usage: obj.test_slice_int64() and returns: array_ops