code: def _process_dbn(process_tuple):
      """
      Extract the best path through the state space in an observation sequence.
  
      This proxy function is necessary to process different sequences in parallel
      using the multiprocessing module.
  
      Parameters
      ----------
      process_tuple : tuple
          Tuple with (HMM, observations).
  
      Returns
      -------
      path : numpy array
          Best path through the state space.
      log_prob : float
          Log probability of the path.
  
      """
      # pylint: disable=no-name-in-module
      return process_tuple[0].viterbi(process_tuple[1])
  
imports: from __future__ import absolute_import, division, print_function
  import sys
  import warnings
  import numpy
  from .beats import threshold_activations
  from .beats_hmm import BarStateSpace, BarTransitionModel, GMMPatternTrackingObservationModel, MultiPatternStateSpace, MultiPatternTransitionModel, RNNBeatTrackingObservationModel, RNNDownBeatTrackingObservationModel
  from ..ml.hmm import HiddenMarkovModel
  from ..processors import ParallelProcessor, Processor, SequentialProcessor
  from ..utils import string_types
label_desc: Use image node_id 1 for calling a global function with example usage: _process_dbn(process_tuple) and returns: process_tuple