code: def __iter__(self):
      while True:
          yield [np.random.uniform(-1, 1, size=self.shape)]
  
imports: import numpy
  import tensorflow
  from tensorpack import BatchNorm, DataFlow, ModelDescBase, StagingInput, TowerTrainer, argscope
  from tensorpack.graph_builder import DataParallelBuilder, LeastLoadedDeviceSetter
  from tensorpack.tfutils.summary import add_moving_summary
  from tensorpack.tfutils.tower import TowerContext, TowerFunc
  from tensorpack.utils import logger
  from tensorpack.utils.argtools import memoized_method
label_desc: Use image node_id 2 for calling the RandomZData obj's underlying member method code with example usage: obj.__iter__() without return types