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```python
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import tempfile                                                                   
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from tokenizers import Tokenizer, models, processors                              
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from transformers.tokenization_utils_fast import PreTrainedTokenizerFast          
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vocab = [(chr(i), i) for i in range(256)]                                         
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tokenizer = Tokenizer(models.Unigram(vocab))                                      
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tokenizer.add_special_tokens(["<bos>", "<eos>"])                                  
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tokenizer.post_processor = processors.TemplateProcessing(                         
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    single="<bos> $0 <eos>", special_tokens=[("<bos>", 256), ("<eos>", 257)]      
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)                                                                                 
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with tempfile.NamedTemporaryFile() as f:                                          
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    tokenizer.save(f.name)                                                        
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    real_tokenizer = PreTrainedTokenizerFast(tokenizer_file=f.name, eos_token="<eos>", bos_token="<bos>")   
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real_tokenizer._tokenizer.save("dummy.json")     
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``` 
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Small change.
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