add model

special_tokens_map.json

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+{"eos_token": "<eos>", "unk_token": "<unk>", "additional_special_tokens": ["<formula>"]}

tokenizer_config.json

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+{"special": null, "min_freq": 0, "max_size": null, "lower_case": false, "delimiter": null, "never_split": null, "unk_token": "<unk>", "eos_token": "<eos>", "additional_special_tokens": ["<formula>"], "language": "en", "special_tokens_map_file": null, "tokenizer_file": null, "name_or_path": "transfo-xl-wt103"}