code: def select_matchedfilter_class(curr_exe):
      
      exe_to_class_map = {
          'pycbc_inspiral'          : PyCBCInspiralExecutable,
          'pycbc_inspiral_skymax'   : PyCBCInspiralExecutable,
          'pycbc_multi_inspiral'    : PyCBCMultiInspiralExecutable,
      }
      try:
          return exe_to_class_map[curr_exe]
      except KeyError:
          # also conceivable to introduce a default class??
          raise NotImplementedError(
              "No job class exists for executable %s, exiting" % curr_exe)
docs: This function returns a class that is appropriate for setting up
      matched-filtering jobs within workflow.
  
      Parameters
      ----------
      curr_exe : string
          The name of the matched filter executable to be used.
  
      Returns
      --------
      exe_class : Sub-class of pycbc.workflow.core.Executable that holds utility
          functions appropriate for the given executable.  Instances of the class
          ('jobs') **must** have methods
          * job.create_node()
          and
          * job.get_valid_times(ifo, )