code: def test_builder_to_backend_smoke(self, compute_unit, backend):
      x = np.array([[1, 2, 3], [4, 5, 6]], dtype=np.float32)
      y = np.array([[-1, 2, -3], [4, -5, 6]], dtype=np.float32)
      input_placeholders = {
          "x": mb.placeholder(shape=x.shape),
          "y": mb.placeholder(shape=y.shape),
      }
      input_values = {"x": x, "y": y}
  
      def build(x, y):
          return mb.equal(x=x, y=y), mb.equal(x=-3.0, y=y)
  
      expected_output_types = [
          (2, 3, types.bool),
          (2, 3, types.bool),
      ]
      expected_outputs = [
          np.array([[0, 1, 0], [1, 0, 1]], dtype=bool),
          np.array([[0, 0, 1], [0, 0, 0]], dtype=bool),
      ]
  
      run_compare_builder(
          build,
          input_placeholders,
          input_values,
          expected_output_types,
          expected_outputs,
          compute_unit=compute_unit,
          backend=backend,
      )
  
imports: import itertools
  import numpy
  import pytest
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import get_new_symbol, types
  from coremltools.converters.mil.mil.ops.tests.iOS14 import backends
  from coremltools.converters.mil.mil.ops.tests.testing_utils import run_compare_builder
  from coremltools.converters.mil.testing_reqs import compute_units
  from coremltools.converters.mil.testing_utils import ssa_fn
label_desc: Use image node_id 1 for calling the TestEqual obj's underlying member method code with example usage: obj.test_builder_to_backend_smoke(compute_unit, backend) and returns: mb,  mb