code: def test_byte_pair_encoding(separator, input, results):
      pairs_table = cudf.Series(
          [
              "t he",
              "h e",
              "e n",
              "i t",
              "i s",
              "e s",
              "en t",
              "c e",
              "es t",
              "en ce",
              "t h",
              "h i",
              "th is",
              "t est",
              "s i",
              "s ent",
          ]
      )
      encoder = BytePairEncoder(pairs_table)
  
      strings = cudf.Series([input, None, "", input])
  
      expected = cudf.Series([results, None, "", results])
  
      actual = encoder(strings, separator)
      assert type(expected) == type(actual)
      assert_eq(expected, actual)
  
imports: import random
  import string
  import numpy
  import pytest
  import cudf
  from cudf.core.byte_pair_encoding import BytePairEncoder
  from cudf.core.tokenize_vocabulary import TokenizeVocabulary
  from cudf.testing._utils import assert_eq
label_desc: Use image node_id 26 for calling a global function with example usage: test_byte_pair_encoding(separator, input, results) without return types