code: def convert_feature(features):
      feature_idx = []
      feature = []
      idx = 0
      for t in features:
          idx += len(t)
          feature_idx.append(idx)
          for f in t:
              feature.append(f)
      return feature_idx, feature
  
file_path: euler/euler/tools/util.py
imports: import struct
  import ctypes
  import os
  import threading
label_desc: Use image node_id 4 for calling a global function with example usage: convert_feature(features) and returns: feature_idx,  feature