No such file or directory: 'inputs/graph/track.graph' about mhp-vos HOT 1 CLOSED

When run python test_mht.py , I got this error at last:

Traceback (most recent call last):
  File "test_mht.py", line 123, in <module>
    main()
  File "test_mht.py", line 90, in main
    roi_numbers = mht.iterTracking()
  File "/home/zhangyu/Projects/MHP-VOS/mht/libs/mht.py", line 110, in iterTracking
    paths, best_solution = self.treeToGraph(i+1, treeId)
  File "/home/zhangyu/Projects/MHP-VOS/mht/libs/mht.py", line 307, in treeToGraph
    self.mwis.write_graph(str_list, str_weights)
  File "/home/zhangyu/Projects/MHP-VOS/mht/libs/mwis.py", line 36, in write_graph
    with open(self.graph_file, 'w') as f:
FileNotFoundError: [Errno 2] No such file or directory: 'inputs/graph/track.graph'

Is this graph generated from code or an offline file?
If it is generated from code, what should I do first?

Thnank you!

You can mkdir the folder inputs/graph under the folder mht

from mhp-vos.