code: def l2Dist(v1, v2):
      dist = 0
      for i in range(0, len(v1["pos"])):
          dist += math.pow(v1["pos"][i] - v2["pos"][i], 2)
      return math.pow(dist, 0.5)
  
file_path: turicreate/src/python/turicreate/toolkits/_evaluate_utils.py
imports: from six.moves import reduce
  import math
  import turicreate
label_desc: Use image node_id 6 for calling a global function with example usage: l2Dist(v1, v2) and returns: math