code: def test_builder_to_backend_stress(
      self, compute_unit, backend, C, H, W
  ):
      input_shape = (1, C, H, W)
      x = np.random.random(input_shape)
  
      crop_h = [np.random.randint(H)]
      crop_h.append(np.random.randint(H - crop_h[0]))
      crop_w = [np.random.randint(W)]
      crop_w.append(np.random.randint(W - crop_w[0]))
  
      input_placeholder_dict = {"x": mb.placeholder(shape=input_shape)}
      input_value_dict = {"x": x}
  
      def build(x):
          return mb.crop(x=x, crop_height=crop_h, crop_width=crop_w)
  
      expected_output_type = (
          1,
          C,
          H - crop_h[0] - crop_h[1],
          W - crop_w[0] - crop_w[1],
          types.fp32,
      )
      expected_output = x[
          :, :, crop_h[0] : H - crop_h[1], crop_w[0] : W - crop_w[1]
      ]
  
      run_compare_builder(
          build,
          input_placeholder_dict,
          input_value_dict,
          expected_output_type,
          expected_output,
          compute_unit=compute_unit,
          backend=backend,
      )
  
imports: import functools
  import itertools
  import numpy
  import pytest
  import coremltools
  from coremltools._deps import _HAS_TORCH, MSG_TORCH_NOT_FOUND
  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 mark_api_breaking, 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 2 for calling the TestCrop obj's underlying member method code with example usage: obj.test_builder_to_backend_stress(compute_unit, backend, C, H, W) and returns: mb