class_docstr: A callback that runs a list of :class:`Inferencer` on some :class:`InputSource`.
code: def _build_hook(self, inf):
      out_names = inf.get_fetches()
      fetches = self._tower_handle.get_tensors(out_names)
      return InferencerToHook(inf, fetches)
  
imports: import itertools
  import sys
  from contextlib import contextmanager
  import tqdm
  from tensorflow.python.training.monitored_session import _HookedSession
  from ..compat import tfv1
  from ..dataflow.base import DataFlow
  from ..input_source import FeedInput, InputSource, QueueInput, StagingInput
  from ..tfutils.tower import PredictTowerContext
  from ..utils import logger
  from ..utils.utils import get_tqdm_kwargs
  from .base import Callback
  from .group import Callbacks
  from .inference import Inferencer
label_desc: Use image node_id 2 for calling the InferenceRunner obj's underlying member method code with example usage: obj._build_hook(inf) and returns: InferencerToHook