docs: def return_single_path_base(dbpath, set_object, object_id):
      """
      Generic function which returns a path (path is relative to the path_to_set stored in the database) of an object
      specified by the object_id
  
      Parameters
      ----------
      dbpath : string, path to SQLite database file
      set_object : object (either TestSet or TrainSet) which is stored in the database
      object_id : int, id of object in database
  
      Returns
      -------
      path : string
      """
      engine = create_engine('sqlite:////' + dbpath)
      session_cl = sessionmaker(bind=engine)
      session = session_cl()
      tmp_object = session.query(set_object).get(object_id)
      session.close()
      return tmp_object.path