class_docstr: RunState is used to save the result of every running step
  Args:
      length (int): the number of fetch result
code: def __init__(self, length: int):
      self.run_time_begin = time.time()
      self.run_step = 0
      self.run_examples = 0
      self.run_results = [0] * length
      self.run_time_used = 0
      self.run_speed = 0.0
  
file_path: PaddleHub/paddlehub/compat/task/task_utils.py
imports: import copy
  import time
  from typing import Any
  import paddle.utils.unique_name
label_desc: Use image node_id 1 to create a new RunState object from inherited base classes: object with example: obj = RunState(length)