code: def max_id(fname):
      mu = 0
      mi = 0
      for line in open(fname):
          tks = line.strip().split("\t")
          if len(tks) != 4:
              continue
          mu = max(mu, int(tks[0]))
          mi = max(mi, int(tks[1]))
      return mu + 1, mi + 1
  
imports: import os
  import mxnet
  from mxnet import gluon
label_desc: Use image node_id 4 for calling a global function with example usage: max_id(fname) and returns: unknown,  unknown