def METHOD_NAME(self):
    super().METHOD_NAME()
    self.tokenizers = [GPT2Tokenizer.from_pretrained(checkpoint) for checkpoint in (TOKENIZER_CHECKPOINTS)]
    self.tf_tokenizers = [TFGPT2Tokenizer.from_pretrained(checkpoint) for checkpoint in TOKENIZER_CHECKPOINTS]
    assert len(self.tokenizers) == len(self.tf_tokenizers)
    self.test_sentences = [
        "This is a straightforward English test sentence.",
        "This one has some weird characters\rto\nsee\r\nif  those\u00E9break things.",
        "Now we're going to add some Chinese: 一 二 三 一二三",
        "And some much more rare Chinese: 齉 堃 齉堃",
        "Je vais aussi écrire en français pour tester les accents",
        "Classical Irish also has some unusual characters, so in they go: Gaelaċ, ꝼ",
    ]
    self.paired_sentences = list(zip(self.test_sentences, self.test_sentences[::-1]))