code: def benchmark_signal_integrity(
      pipe,
      candidates,
      nbits,
      cumulative,
      in_ngroups=1,
      out_ngroups=1,
      ref_out=None,
  ):
      results = {}
      results["metadata"] = {
          "nbits": nbits,
          "out_ngroups": out_ngroups,
          "in_ngroups": in_ngroups,
          "cumulative": cumulative,
      }
  
      # If reference outputs are not provided, treat current pipe as reference
      if ref_out is None:
          ref_out = run_pipe(pipe)
  
      for candidate in tqdm(candidates):
          palettized = False
          for name, module in pipe.unet.named_modules():
              if name == candidate:
                  orig_weight = fake_palettize(
                      module,
                      nbits,
                      out_ngroups=out_ngroups,
                      in_ngroups=in_ngroups,
                  )
                  palettized = True
                  break
          if not palettized:
              raise KeyError(name)
  
          test_out = run_pipe(pipe)
  
          if not cumulative:
              restore_weight(module, orig_weight)
  
          results[candidate] = [
              float(f"{compute_psnr(r,t):.1f}")
              for r, t in zip(ref_out, test_out)
          ]
          logger.info(
              f"{nbits}-bit: {candidate} = {results[candidate]}"
          )
  
      return results
  
imports: from collections import OrderedDict
  from copy import deepcopy
  from functools import partial
  import argparse
  import gc
  import json
  import logging
  import numpy
  import os
  from PIL import Image
  from python_coreml_stable_diffusion.torch2coreml import compute_psnr, get_pipeline
  import time
  import torch
  import torch.nn
  import requests
  from tqdm import tqdm, trange
  from coremltools.converters.mil.mil import types
label_desc: Use image node_id 9 for calling a global function with example usage: benchmark_signal_integrity(pipe, candidates, nbits, cumulative, in_ngroups, out_ngroups, ref_out) and returns: results