class_docstr: Produce images read from a list of zip files. 
code: def reset_state(self):
      super(ImageDataFromZIPFile, self).reset_state()
      # Seems necessary to reopen the zip file in forked processes.
      self.open()
  
imports: import argparse
  import numpy
  import os
  import zipfile
  import cv2
  from tensorpack import LMDBSerializer, MapDataComponent, RNGDataFlow
label_desc: Use image node_id 3 for calling the ImageDataFromZIPFile obj's underlying member method code with example usage: obj.reset_state() without return types