code: def _make_value_matrix(self):
      index = self._df.index.tolist()
      values = self._df.values.tolist()
      value_matrix = []
      for transform, results in zip(index, values):
          row = [transform] + self._highlight_best_result(results)
          value_matrix.append(row)
      return value_matrix
  
imports: from PIL import Image
  import cv2
  import argparse
  import os
  import pkg_resources
  import sys
  import math
  import numpy
  from augbench.constants import DEFAULT_BENCHMARKING_LIBRARIES
  from pytablewriter import MarkdownTableWriter
  from pytablewriter.style import Style
label_desc: Use image node_id 4 for calling the MarkdownGenerator obj's underlying member method code with example usage: obj._make_value_matrix() and returns: value_matrix