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	# coding=utf-8
	# Copyright 2018 The Open AI Team Authors and The HuggingFace Inc. team.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	"""Tokenization classes for OpenAI GPT."""


	import json
	import os
	from functools import lru_cache
	from typing import List, Optional, Tuple

	import regex as re

	from transformers.tokenization_utils import AddedToken, PreTrainedTokenizer
	from transformers.utils import logging


	logger = logging.get_logger(__name__)

	VOCAB_FILES_NAMES = {
	"vocab_file": "vocab.json",
	"merges_file": "merges.txt",
	}

	PRETRAINED_VOCAB_FILES_MAP = {
	"vocab_file": {
	"gpt2": "https://huggingface.co/gpt2/resolve/main/vocab.json",
	"gpt2-medium": "https://huggingface.co/gpt2-medium/resolve/main/vocab.json",
	"gpt2-large": "https://huggingface.co/gpt2-large/resolve/main/vocab.json",
	"gpt2-xl": "https://huggingface.co/gpt2-xl/resolve/main/vocab.json",
	"distilgpt2": "https://huggingface.co/distilgpt2/resolve/main/vocab.json",
	},
	"merges_file": {
	"gpt2": "https://huggingface.co/gpt2/resolve/main/merges.txt",
	"gpt2-medium": "https://huggingface.co/gpt2-medium/resolve/main/merges.txt",
	"gpt2-large": "https://huggingface.co/gpt2-large/resolve/main/merges.txt",
	"gpt2-xl": "https://huggingface.co/gpt2-xl/resolve/main/merges.txt",
	"distilgpt2": "https://huggingface.co/distilgpt2/resolve/main/merges.txt",
	},
	}

	PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES = {
	"mupt-110M": 8192,
	"mupt-345M": 8192,
	"mupt-770M": 8192,
	"mupt-1.3B": 8192,
	}


	@lru_cache()
	def bytes_to_unicode():
	"""
	Returns list of utf-8 byte and a mapping to unicode strings. We specifically avoids mapping to whitespace/control
	characters the bpe code barfs on.

	The reversible bpe codes work on unicode strings. This means you need a large # of unicode characters in your vocab
	if you want to avoid UNKs. When you're at something like a 10B token dataset you end up needing around 5K for
	decent coverage. This is a significant percentage of your normal, say, 32K bpe vocab. To avoid that, we want lookup
	tables between utf-8 bytes and unicode strings.
	"""
	bs = (
	list(range(ord("!"), ord("~") + 1)) + list(range(ord("¡"), ord("¬") + 1)) + list(range(ord("®"), ord("ÿ") + 1))
	)
	cs = bs[:]
	n = 0
	for b in range(2**8):
	if b not in bs:
	bs.append(b)
	cs.append(2**8 + n)
	n += 1
	cs = [chr(n) for n in cs]
	return dict(zip(bs, cs))


	def get_pairs(word):
	"""
	Return set of symbol pairs in a word.

	Word is represented as tuple of symbols (symbols being variable-length strings).
	"""
	pairs = set()
	prev_char = word[0]
	for char in word[1:]:
	pairs.add((prev_char, char))
	prev_char = char
	return pairs


	class MuPTTokenizer(PreTrainedTokenizer):
	"""
	Construct a GPT-2 tokenizer. Based on byte-level Byte-Pair-Encoding.

	This tokenizer has been trained to treat spaces like parts of the tokens (a bit like sentencepiece) so a word will
	be encoded differently whether it is at the beginning of the sentence (without space) or not:

	```python
	>>> from transformers import GPT2Tokenizer

	>>> tokenizer = GPT2Tokenizer.from_pretrained("gpt2")
	>>> tokenizer("Hello world")["input_ids"]
	[15496, 995]

	>>> tokenizer(" Hello world")["input_ids"]
	[18435, 995]
	```

	You can get around that behavior by passing `add_prefix_space=True` when instantiating this tokenizer or when you
	call it on some text, but since the model was not pretrained this way, it might yield a decrease in performance.

	<Tip>

	When used with `is_split_into_words=True`, this tokenizer will add a space before each word (even the first one).

	</Tip>

	This tokenizer inherits from [`PreTrainedTokenizer`] which contains most of the main methods. Users should refer to
	this superclass for more information regarding those methods.

	Args:
	vocab_file (`str`):
	Path to the vocabulary file.
	merges_file (`str`):
	Path to the merges file.
	errors (`str`, optional, defaults to `"replace"`):
	Paradigm to follow when decoding bytes to UTF-8. See
	[bytes.decode](https://docs.python.org/3/library/stdtypes.html#bytes.decode) for more information.
	unk_token (`str`, optional, defaults to `"<\|endoftext\|>"`):
	The unknown token. A token that is not in the vocabulary cannot be converted to an ID and is set to be this
	token instead.
	bos_token (`str`, optional, defaults to `"<\|endoftext\|>"`):
	The beginning of sequence token.
	eos_token (`str`, optional, defaults to `"<\|endoftext\|>"`):
	The end of sequence token.
	pad_token (`str`, optional):
	The token used for padding, for example when batching sequences of different lengths.
	add_prefix_space (`bool`, optional, defaults to `False`):
	Whether or not to add an initial space to the input. This allows to treat the leading word just as any
	other word. (GPT2 tokenizer detect beginning of words by the preceding space).
	add_bos_token (`bool`, optional, defaults to `False`):
	Whether or not to add an initial beginning of sentence token to the input. This allows to treat the leading
	word just as any other word.
	"""

	vocab_files_names = VOCAB_FILES_NAMES
	pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
	max_model_input_sizes = PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
	model_input_names = ["input_ids", "attention_mask"]

	def __init__(
	self,
	vocab_file,
	merges_file,
	errors="replace",
	unk_token="<unk>",
	bos_token="<bos>",
	eos_token="<eos>",
	pad_token="<pad>",
	add_prefix_space=False,
	add_bos_token=False,
	**kwargs,
	):
	bos_token = AddedToken(bos_token, lstrip=False, rstrip=False) if isinstance(bos_token, str) else bos_token
	eos_token = AddedToken(eos_token, lstrip=False, rstrip=False) if isinstance(eos_token, str) else eos_token
	unk_token = AddedToken(unk_token, lstrip=False, rstrip=False) if isinstance(unk_token, str) else unk_token
	pad_token = AddedToken(pad_token, lstrip=False, rstrip=False) if isinstance(pad_token, str) else pad_token

	self.add_bos_token = add_bos_token

	with open(vocab_file, encoding="utf-8") as vocab_handle:
	self.encoder = json.load(vocab_handle)
	self.decoder = {v: k for k, v in self.encoder.items()}
	self.errors = errors # how to handle errors in decoding
	self.byte_encoder = bytes_to_unicode()
	self.byte_decoder = {v: k for k, v in self.byte_encoder.items()}
	with open(merges_file, encoding="utf-8") as merges_handle:
	bpe_merges = merges_handle.read().split("\n")[1:-1]
	bpe_merges = [tuple(merge.split()) for merge in bpe_merges]
	self.bpe_ranks = dict(zip(bpe_merges, range(len(bpe_merges))))
	self.cache = {}
	self.add_prefix_space = add_prefix_space

	# Should have added re.IGNORECASE so BPE merges can happen for capitalized versions of contractions
	self.pat = re.compile(r"""'s\|'t\|'re\|'ve\|'m\|'ll\|'d\| ?\p{L}+\| ?\p{N}+\| ?[^\s\p{L}\p{N}]+\|\s+(?!\S)\|\s+""")

	super().__init__(
	errors=errors,
	unk_token=unk_token,
	bos_token=bos_token,
	eos_token=eos_token,
	pad_token=pad_token,
	add_prefix_space=add_prefix_space,
	add_bos_token=add_bos_token,
	**kwargs,
	)

	@property
	def vocab_size(self):
	return len(self.encoder)

	def get_vocab(self):
	return dict(self.encoder, **self.added_tokens_encoder)

	def bpe(self, token):
	if token in self.cache:
	return self.cache[token]
	word = tuple(token)
	pairs = get_pairs(word)

	if not pairs:
	return token

	while True:
	bigram = min(pairs, key=lambda pair: self.bpe_ranks.get(pair, float("inf")))
	if bigram not in self.bpe_ranks:
	break
	first, second = bigram
	new_word = []
	i = 0
	while i < len(word):
	try:
	j = word.index(first, i)
	except ValueError:
	new_word.extend(word[i:])
	break
	else:
	new_word.extend(word[i:j])
	i = j

	if word[i] == first and i < len(word) - 1 and word[i + 1] == second:
	new_word.append(first + second)
	i += 2
	else:
	new_word.append(word[i])
	i += 1
	new_word = tuple(new_word)
	word = new_word
	if len(word) == 1:
	break
	else:
	pairs = get_pairs(word)
	word = " ".join(word)
	self.cache[token] = word
	return word

	def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None):
	if self.add_bos_token:
	bos_token_ids = [self.bos_token_id]
	else:
	bos_token_ids = []

	output = bos_token_ids + token_ids_0

	if token_ids_1 is None:
	return output

	return output + bos_token_ids + token_ids_1

	def get_special_tokens_mask(
	self, token_ids_0: List[int], token_ids_1: Optional[List[int]] = None, already_has_special_tokens: bool = False
	) -> List[int]:
	"""
	Retrieves sequence ids from a token list that has no special tokens added. This method is called when adding
	special tokens using the tokenizer `prepare_for_model` or `encode_plus` methods.

	Args:
	token_ids_0 (`List[int]`):
	List of IDs.
	token_ids_1 (`List[int]`, optional):
	Optional second list of IDs for sequence pairs.
	already_has_special_tokens (`bool`, optional, defaults to `False`):
	Whether or not the token list is already formatted with special tokens for the model.

	Returns:
	`List[int]`: A list of integers in the range [0, 1]: 1 for a special token, 0 for a sequence token.
	"""
	if already_has_special_tokens:
	return super().get_special_tokens_mask(
	token_ids_0=token_ids_0, token_ids_1=token_ids_1, already_has_special_tokens=True
	)

	if not self.add_bos_token:
	return super().get_special_tokens_mask(
	token_ids_0=token_ids_0, token_ids_1=token_ids_1, already_has_special_tokens=False
	)

	if token_ids_1 is None:
	return [1] + ([0] * len(token_ids_0))
	return [1] + ([0] * len(token_ids_0)) + [1] + ([0] * len(token_ids_1))

	def _tokenize(self, text):
	"""Tokenize a string."""
	bpe_tokens = []
	for token in re.findall(self.pat, text):
	token = "".join(
	self.byte_encoder[b] for b in token.encode("utf-8")
	) # Maps all our bytes to unicode strings, avoiding control tokens of the BPE (spaces in our case)
	bpe_tokens.extend(bpe_token for bpe_token in self.bpe(token).split(" "))
	return bpe_tokens

	def _convert_token_to_id(self, token):
	"""Converts a token (str) in an id using the vocab."""
	return self.encoder.get(token, self.encoder.get(self.unk_token))

	def _convert_id_to_token(self, index):
	"""Converts an index (integer) in a token (str) using the vocab."""
	return self.decoder.get(index)

	def convert_tokens_to_string(self, tokens):
	"""Converts a sequence of tokens (string) in a single string."""
	text = "".join(tokens)
	text = bytearray([self.byte_decoder[c] for c in text]).decode("utf-8", errors=self.errors)
	return text

	def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]:
	if not os.path.isdir(save_directory):
	logger.error(f"Vocabulary path ({save_directory}) should be a directory")
	return
	vocab_file = os.path.join(
	save_directory, (filename_prefix + "-" if filename_prefix else "") + VOCAB_FILES_NAMES["vocab_file"]
	)
	merge_file = os.path.join(
	save_directory, (filename_prefix + "-" if filename_prefix else "") + VOCAB_FILES_NAMES["merges_file"]
	)

	with open(vocab_file, "w", encoding="utf-8") as f:
	f.write(json.dumps(self.encoder, indent=2, sort_keys=True, ensure_ascii=False) + "\n")

	index = 0
	with open(merge_file, "w", encoding="utf-8") as writer:
	writer.write("#version: 0.2\n")
	for bpe_tokens, token_index in sorted(self.bpe_ranks.items(), key=lambda kv: kv[1]):
	if index != token_index:
	logger.warning(
	f"Saving vocabulary to {merge_file}: BPE merge indices are not consecutive."
	" Please check that the tokenizer is not corrupted!"
	)
	index = token_index
	writer.write(" ".join(bpe_tokens) + "\n")
	index += 1

	return vocab_file, merge_file

	def prepare_for_tokenization(self, text, is_split_into_words=False, **kwargs):
	add_prefix_space = kwargs.pop("add_prefix_space", self.add_prefix_space)
	if is_split_into_words or add_prefix_space:
	text = " " + text
	return (text, kwargs)

	@property
	def default_chat_template(self):
	"""
	A simple chat template that ignores role information and just concatenates messages with EOS tokens.
	"""
	logger.warning_once(
	"\nNo chat template is defined for this tokenizer - using the default template "
	f"for the {self.__class__.__name__} class. If the default is not appropriate for "
	"your model, please set `tokenizer.chat_template` to an appropriate template. "
	"See https://huggingface.co/docs/transformers/main/chat_templating for more information.\n"
	)
	return "{% for message in messages %}" "{{ message.content }}{{ eos_token }}" "{% endfor %}"