docstr: Get the backpointers for the current timestep.
code: def get_current_origin(self):
      "Get the backpointers for the current timestep."
      return self.prevKs[-1]
  
file_path: stanza/stanza/models/common/beam.py
imports: from __future__ import division
  import torch
  import stanza.models.common.seq2seq_constant
label_desc: Use image node_id 3 for calling the Beam obj's underlying member method code with example usage: obj.get_current_origin() and returns: self