class_docstr: Base class for all async predictors. 
code: def _do_call(self, dp):
      fut = self.put_task(dp)
      # in Tornado, Future.result() doesn't wait
      return fut.result()
  
imports: from abc import ABCMeta, abstractmethod
  import six
  import tensorflow
  from ..input_source import PlaceholderInput
  from ..tfutils.common import get_tensors_by_names, get_op_tensor_name
  from ..tfutils.tower import PredictTowerContext
label_desc: Use image node_id 3 for calling the AsyncPredictorBase obj's underlying member method code with example usage: obj._do_call(dp) and returns: fut