class_docstr: time mask
code: def __init__(self, max_mask_length):
      self.max_mask_length = max_mask_length
  
imports: import random
  import cv2
  import numpy
  import torch
  from scipy import signal
label_desc: Use image node_id 1 to create a new TimeMask object  with example: obj = TimeMask(max_mask_length)