code: def GetHistToStateMap(self):
      # This function, called from PrintAsFst, returns a map from
      # history to integer FST-state.
      hist_to_state = dict()
      fst_state_counter = 0
      for n in range(0, args.ngram_order):
          for hist in self.counts[n].keys():
              hist_to_state[hist] = fst_state_counter
              fst_state_counter += 1
      return hist_to_state
  
imports: import argparse
  import math
  import sys
  from collections import defaultdict
label_desc: Use image node_id 7 for calling the NgramCounts obj's underlying member method code with example usage: obj.GetHistToStateMap() and returns: hist_to_state