code: def throw_empty_pairs(src_tgt_pairs):
      """Filter [src,tgt] tuple from input list of pairs if either element is empty.
  
      Args:
        src_tgt_pairs: list of (src,tgt) pairs
  
      Returns:
        subset of input pair list for which all elements are non-empty
      """
      return [x for x in src_tgt_pairs if x[0] and x[1]]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import math
  import os
  import random
  import re
  import subprocess
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import text_encoder
  import tensorflow.compat.v1
label_desc: Use image node_id 23 for calling a global function with example usage: throw_empty_pairs(src_tgt_pairs) and returns: unknown