code: def _reset(self):
      self.next_index = 0
      if isinstance(self.x, tf.data.Dataset):
          self.x_iter = iter(self.x)
      else:
          self.x_iter = iter(self.x)
          self.y_iter = iter(self.y)
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/openvino/tf/dataloader.py
imports: from openvino.tools.pot import DataLoader
  import tensorflow
  from bigdl.nano.utils.common import invalidInputError
label_desc: Use image node_id 4 for calling the KerasOpenVINODataLoader obj's underlying member method code with example usage: obj._reset() without return types