code: def test_builder_to_backend_smoke(self, compute_unit, backend):
      x_val = np.array(
          [[[1.0, -7.0], [5.0, -6.0], [-3.0, -5.0]]], dtype=np.float32
      )
      input_placeholders = {"x": mb.placeholder(shape=x_val.shape)}
      input_values = {"x": x_val}
  
      def build(x):
          return [
              mb.local_response_norm(x=x, size=2),
              mb.local_response_norm(
                  x=x, size=3, alpha=0.0001, beta=0.75, k=1.0
              ),
          ]
  
      expected_output_types = [
          (1, 3, 2, types.fp32),
          (1, 3, 2, types.fp32),
      ]
      expected_outputs = [
          np.array(
              [
                  [
                      [0.99996257, -6.98716545],
                      [4.99531746, -5.99191284],
                      [-2.99898791, -4.99531746],
                  ]
              ],
              dtype=np.float32,
          ),
          np.array(
              [
                  [
                      [0.99997497, -6.99143696],
                      [4.99687672, -5.99460602],
                      [-2.99932504, -4.99687672],
                  ]
              ],
              dtype=np.float32,
          ),
      ]
  
      run_compare_builder(
          build,
          input_placeholders,
          input_values,
          expected_output_types,
          expected_outputs,
          compute_unit=compute_unit,
          backend=backend,
      )
  
imports: import itertools
  import platform
  import numpy
  import pytest
  import coremltools
  from coremltools._deps import _HAS_TF_2, _HAS_TORCH, MSG_TF2_NOT_FOUND, MSG_TORCH_NOT_FOUND
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import Function, get_new_symbol, types
  from coremltools.converters.mil.mil.ops.tests.iOS14 import backends
  from coremltools.converters.mil.mil.ops.tests.testing_utils import UNK_SYM, construct_inputs_from_placeholders, run_compare_builder
  from coremltools.converters.mil.testing_reqs import compute_units
  from coremltools.converters.mil.testing_utils import random_gen
label_desc: Use image node_id 1 for calling the TestNormalizationLocalResponseNorm obj's underlying member method code with example usage: obj.test_builder_to_backend_smoke(compute_unit, backend) and returns: list