add tokenizer

added_tokens.json

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+{"<|BOS|>": 50257, "<|PAD|>": 50260, "<|UNK|>": 50259, "<|SEP|>": 50261, "<|EOS|>": 50258}

special_tokens_map.json

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+{"bos_token": "<|BOS|>", "eos_token": "<|EOS|>", "unk_token": "<|UNK|>", "sep_token": "<|SEP|>", "pad_token": "<|PAD|>"}

tokenizer_config.json

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+{"unk_token": "<|endoftext|>", "bos_token": "<|endoftext|>", "eos_token": "<|endoftext|>", "add_prefix_space": false, "model_max_length": 1024, "special_tokens_map_file": null, "name_or_path": "gpt2", "tokenizer_class": "GPT2Tokenizer"}