code: def test_builder_to_backend_stress(
      self, use_cpu_only, backend, dim, chan
  ):
      shape = np.array([chan, dim, dim])
      x_val = np.random.rand(*shape)
      alpha_val = np.random.rand(chan).astype(np.float32)
  
      input_placeholders = {"x": mb.placeholder(shape=x_val.shape)}
      input_values = {"x": x_val}
  
      def build(x):
          return [mb.prelu(x=x, alpha=alpha_val)]
  
      alpha_br = np.copy(alpha_val)
      for i in range(1, len(x_val.shape)):
          alpha_br = np.expand_dims(alpha_br, i)
      x_pos = np.maximum(x_val, 0)
      b = np.minimum(x_val, 0)
  
      expected_outputs = [x_pos + b * alpha_br]
      expected_output_types = [
          o.shape[:] + (types.fp32,) for o in expected_outputs
      ]
  
      run_compare_builder(
          build,
          input_placeholders,
          input_values,
          expected_output_types,
          expected_outputs=expected_outputs,
          use_cpu_only=use_cpu_only,
          backend=backend,
      )
  
imports: from scipy import special
  import scipy
  from coremltools.converters.mil import testing_reqs
  from coremltools.converters.mil.testing_reqs import *
  from .testing_utils import run_compare_builder
label_desc: Use image node_id 6 for calling the TestPReLU obj's underlying member method code with example usage: obj.test_builder_to_backend_stress(use_cpu_only, backend, dim, chan) and returns: list