small100 / tokenization_small100.py

add tokenizer code

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	# Copyright (c) 2022 Idiap Research Institute, http://www.idiap.ch/
	# Written by Alireza Mohammadshahi <alireza.mohammadshahi@idiap.ch>
	# This is a modified version of https://github.com/huggingface/transformers/blob/main/src/transformers/models/m2m_100/tokenization_m2m_100.py
	# which owns by Fariseq 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 SMALL100."""
	import json
	import os
	from pathlib import Path
	from shutil import copyfile
	from typing import Any, Dict, List, Optional, Tuple, Union

	import sentencepiece

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


	logger = logging.get_logger(__name__)

	SPIECE_UNDERLINE = "▁"

	VOCAB_FILES_NAMES = {
	"vocab_file": "vocab.json",
	"spm_file": "sentencepiece.bpe.model",
	"tokenizer_config_file": "tokenizer_config.json",
	}

	PRETRAINED_VOCAB_FILES_MAP = {
	"vocab_file": {
	"alirezamsh/small100": "https://huggingface.co/alirezamsh/small100/resolve/main/vocab.json",
	},
	"spm_file": {
	"alirezamsh/small100": "https://huggingface.co/alirezamsh/small100/resolve/main/sentencepiece.bpe.model",
	},
	"tokenizer_config_file": {
	"alirezamsh/small100": "https://huggingface.co/alirezamsh/small100/resolve/main/tokenizer_config.json",
	},
	}

	PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES = {
	"alirezamsh/small100": 1024,
	}

	# fmt: off
	FAIRSEQ_LANGUAGE_CODES = {
	"m2m100": ["af", "am", "ar", "ast", "az", "ba", "be", "bg", "bn", "br", "bs", "ca", "ceb", "cs", "cy", "da", "de", "el", "en", "es", "et", "fa", "ff", "fi", "fr", "fy", "ga", "gd", "gl", "gu", "ha", "he", "hi", "hr", "ht", "hu", "hy", "id", "ig", "ilo", "is", "it", "ja", "jv", "ka", "kk", "km", "kn", "ko", "lb", "lg", "ln", "lo", "lt", "lv", "mg", "mk", "ml", "mn", "mr", "ms", "my", "ne", "nl", "no", "ns", "oc", "or", "pa", "pl", "ps", "pt", "ro", "ru", "sd", "si", "sk", "sl", "so", "sq", "sr", "ss", "su", "sv", "sw", "ta", "th", "tl", "tn", "tr", "uk", "ur", "uz", "vi", "wo", "xh", "yi", "yo", "zh", "zu"]
	}
	# fmt: on


	class SMALL100Tokenizer(PreTrainedTokenizer):
	"""
	Construct an SMALL100 tokenizer. Based on [SentencePiece](https://github.com/google/sentencepiece).
	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.
	spm_file (`str`):
	Path to [SentencePiece](https://github.com/google/sentencepiece) file (generally has a .spm extension) that
	contains the vocabulary.
	tgt_lang (`str`, optional):
	A string representing the target language.
	eos_token (`str`, optional, defaults to `"</s>"`):
	The end of sequence token.
	sep_token (`str`, optional, defaults to `"</s>"`):
	The separator token, which is used when building a sequence from multiple sequences, e.g. two sequences for
	sequence classification or for a text and a question for question answering. It is also used as the last
	token of a sequence built with special tokens.
	unk_token (`str`, optional, defaults to `"<unk>"`):
	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.
	pad_token (`str`, optional, defaults to `"<pad>"`):
	The token used for padding, for example when batching sequences of different lengths.
	language_codes (`str`, optional):
	What language codes to use. Should be `"m2m100"`.
	sp_model_kwargs (`dict`, optional):
	Will be passed to the `SentencePieceProcessor.__init__()` method. The [Python wrapper for
	SentencePiece](https://github.com/google/sentencepiece/tree/master/python) can be used, among other things,
	to set:
	- `enable_sampling`: Enable subword regularization.
	- `nbest_size`: Sampling parameters for unigram. Invalid for BPE-Dropout.
	- `nbest_size = {0,1}`: No sampling is performed.
	- `nbest_size > 1`: samples from the nbest_size results.
	- `nbest_size < 0`: assuming that nbest_size is infinite and samples from the all hypothesis (lattice)
	using forward-filtering-and-backward-sampling algorithm.
	- `alpha`: Smoothing parameter for unigram sampling, and dropout probability of merge operations for
	BPE-dropout.
	Examples:
	```python
	>>> from tokenization_small100 import SMALL100Tokenizer
	>>> tokenizer = SMALL100Tokenizer.from_pretrained("alirezamsh/small100", tgt_lang="ro")
	>>> src_text = " UN Chief Says There Is No Military Solution in Syria"
	>>> tgt_text = "Şeful ONU declară că nu există o soluţie militară în Siria"
	>>> model_inputs = tokenizer(src_text, text_target=tgt_text, return_tensors="pt")
	>>> model(**model_inputs) # should work
	```"""

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

	prefix_tokens: List[int] = []
	suffix_tokens: List[int] = []

	def __init__(
	self,
	vocab_file,
	spm_file,
	tgt_lang=None,
	bos_token="<s>",
	eos_token="</s>",
	sep_token="</s>",
	pad_token="<pad>",
	unk_token="<unk>",
	language_codes="m2m100",
	sp_model_kwargs: Optional[Dict[str, Any]] = None,
	num_madeup_words=8,
	**kwargs,
	) -> None:
	self.sp_model_kwargs = {} if sp_model_kwargs is None else sp_model_kwargs

	self.language_codes = language_codes
	fairseq_language_code = FAIRSEQ_LANGUAGE_CODES[language_codes]
	self.lang_code_to_token = {lang_code: f"__{lang_code}__" for lang_code in fairseq_language_code}

	kwargs["additional_special_tokens"] = kwargs.get("additional_special_tokens", [])
	kwargs["additional_special_tokens"] += [
	self.get_lang_token(lang_code)
	for lang_code in fairseq_language_code
	if self.get_lang_token(lang_code) not in kwargs["additional_special_tokens"]
	]

	super().__init__(
	tgt_lang=tgt_lang,
	bos_token=bos_token,
	eos_token=eos_token,
	sep_token=sep_token,
	unk_token=unk_token,
	pad_token=pad_token,
	language_codes=language_codes,
	sp_model_kwargs=self.sp_model_kwargs,
	num_madeup_words=num_madeup_words,
	**kwargs,
	)

	self.vocab_file = vocab_file
	self.encoder = load_json(vocab_file)
	self.decoder = {v: k for k, v in self.encoder.items()}
	self.spm_file = spm_file
	self.sp_model = load_spm(spm_file, self.sp_model_kwargs)

	self.encoder_size = len(self.encoder)

	self.lang_token_to_id = {
	self.get_lang_token(lang_code): self.encoder_size + i for i, lang_code in enumerate(fairseq_language_code)
	}
	self.lang_code_to_id = {lang_code: self.encoder_size + i for i, lang_code in enumerate(fairseq_language_code)}
	self.id_to_lang_token = {v: k for k, v in self.lang_token_to_id.items()}

	self._tgt_lang = tgt_lang if tgt_lang is not None else "en"
	self.cur_lang_id = self.get_lang_id(self._tgt_lang)
	self.set_lang_special_tokens(self._tgt_lang)

	self.num_madeup_words = num_madeup_words

	@property
	def vocab_size(self) -> int:
	return len(self.encoder) + len(self.lang_token_to_id) + self.num_madeup_words

	@property
	def tgt_lang(self) -> str:
	return self._tgt_lang

	@tgt_lang.setter
	def tgt_lang(self, new_tgt_lang: str) -> None:
	self._tgt_lang = new_tgt_lang
	self.set_lang_special_tokens(self._tgt_lang)

	def _tokenize(self, text: str) -> List[str]:
	return self.sp_model.encode(text, out_type=str)

	def _convert_token_to_id(self, token):
	if token in self.lang_token_to_id:
	return self.lang_token_to_id[token]
	return self.encoder.get(token, self.encoder[self.unk_token])

	def _convert_id_to_token(self, index: int) -> str:
	"""Converts an index (integer) in a token (str) using the decoder."""
	if index in self.id_to_lang_token:
	return self.id_to_lang_token[index]
	return self.decoder.get(index, self.unk_token)

	def convert_tokens_to_string(self, tokens: List[str]) -> str:
	"""Converts a sequence of tokens (strings for sub-words) in a single string."""
	return self.sp_model.decode(tokens)

	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]:
	"""
	Retrieve 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` method.
	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
	)

	prefix_ones = [1] * len(self.prefix_tokens)
	suffix_ones = [1] * len(self.suffix_tokens)
	if token_ids_1 is None:
	return prefix_ones + ([0] * len(token_ids_0)) + suffix_ones
	return prefix_ones + ([0] * len(token_ids_0)) + ([0] * len(token_ids_1)) + suffix_ones

	def build_inputs_with_special_tokens(
	self, token_ids_0: List[int], token_ids_1: Optional[List[int]] = None
	) -> List[int]:
	"""
	Build model inputs from a sequence or a pair of sequence for sequence classification tasks by concatenating and
	adding special tokens. An MBART sequence has the following format, where `X` represents the sequence:
	- `input_ids` (for encoder) `X [eos, src_lang_code]`
	- `decoder_input_ids`: (for decoder) `X [eos, tgt_lang_code]`
	BOS is never used. Pairs of sequences are not the expected use case, but they will be handled without a
	separator.
	Args:
	token_ids_0 (`List[int]`):
	List of IDs to which the special tokens will be added.
	token_ids_1 (`List[int]`, optional):
	Optional second list of IDs for sequence pairs.
	Returns:
	`List[int]`: List of [input IDs](../glossary#input-ids) with the appropriate special tokens.
	"""
	if token_ids_1 is None:
	if self.prefix_tokens is None:
	return token_ids_0 + self.suffix_tokens
	else:
	return self.prefix_tokens + token_ids_0 + self.suffix_tokens
	# We don't expect to process pairs, but leave the pair logic for API consistency
	if self.prefix_tokens is None:
	return token_ids_0 + token_ids_1 + self.suffix_tokens
	else:
	return self.prefix_tokens + token_ids_0 + token_ids_1 + self.suffix_tokens

	def get_vocab(self) -> Dict:
	vocab = {self.convert_ids_to_tokens(i): i for i in range(self.vocab_size)}
	vocab.update(self.added_tokens_encoder)
	return vocab

	def __getstate__(self) -> Dict:
	state = self.__dict__.copy()
	state["sp_model"] = None
	return state

	def __setstate__(self, d: Dict) -> None:
	self.__dict__ = d

	# for backward compatibility
	if not hasattr(self, "sp_model_kwargs"):
	self.sp_model_kwargs = {}

	self.sp_model = load_spm(self.spm_file, self.sp_model_kwargs)

	def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]:
	save_dir = Path(save_directory)
	if not save_dir.is_dir():
	raise OSError(f"{save_directory} should be a directory")
	vocab_save_path = save_dir / (
	(filename_prefix + "-" if filename_prefix else "") + self.vocab_files_names["vocab_file"]
	)
	spm_save_path = save_dir / (
	(filename_prefix + "-" if filename_prefix else "") + self.vocab_files_names["spm_file"]
	)

	save_json(self.encoder, vocab_save_path)

	if os.path.abspath(self.spm_file) != os.path.abspath(spm_save_path) and os.path.isfile(self.spm_file):
	copyfile(self.spm_file, spm_save_path)
	elif not os.path.isfile(self.spm_file):
	with open(spm_save_path, "wb") as fi:
	content_spiece_model = self.sp_model.serialized_model_proto()
	fi.write(content_spiece_model)

	return (str(vocab_save_path), str(spm_save_path))

	def prepare_seq2seq_batch(
	self,
	src_texts: List[str],
	tgt_texts: Optional[List[str]] = None,
	tgt_lang: str = "ro",
	**kwargs,
	) -> BatchEncoding:
	self.tgt_lang = tgt_lang
	self.set_lang_special_tokens(self.tgt_lang)
	return super().prepare_seq2seq_batch(src_texts, tgt_texts, **kwargs)

	def _build_translation_inputs(self, raw_inputs, tgt_lang: Optional[str], **extra_kwargs):
	"""Used by translation pipeline, to prepare inputs for the generate function"""
	if tgt_lang is None:
	raise ValueError("Translation requires a `tgt_lang` for this model")
	self.tgt_lang = tgt_lang
	inputs = self(raw_inputs, add_special_tokens=True, **extra_kwargs)
	return inputs

	def _switch_to_input_mode(self):
	self.set_lang_special_tokens(self.tgt_lang)

	def _switch_to_target_mode(self):
	self.prefix_tokens = None
	self.suffix_tokens = [self.eos_token_id]

	def set_lang_special_tokens(self, src_lang: str) -> None:
	"""Reset the special tokens to the tgt lang setting. No prefix and suffix=[eos, tgt_lang_code]."""
	lang_token = self.get_lang_token(src_lang)
	self.cur_lang_id = self.lang_token_to_id[lang_token]
	self.prefix_tokens = [self.cur_lang_id]
	self.suffix_tokens = [self.eos_token_id]

	def get_lang_token(self, lang: str) -> str:
	return self.lang_code_to_token[lang]

	def get_lang_id(self, lang: str) -> int:
	lang_token = self.get_lang_token(lang)
	return self.lang_token_to_id[lang_token]


	def load_spm(path: str, sp_model_kwargs: Dict[str, Any]) -> sentencepiece.SentencePieceProcessor:
	spm = sentencepiece.SentencePieceProcessor(**sp_model_kwargs)
	spm.Load(str(path))
	return spm


	def load_json(path: str) -> Union[Dict, List]:
	with open(path, "r") as f:
	return json.load(f)


	def save_json(data, path: str) -> None:
	with open(path, "w") as f:
	json.dump(data, f, indent=2)