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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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import json
import re
import warnings
from contextlib import contextmanager
from pathlib import Path
from shutil import copyfile
from typing import Any, Dict, List, Optional, Tuple, Union
import sentencepiece
from ...tokenization_utils import PreTrainedTokenizer
VOCAB_FILES_NAMES = {
"source_spm": "source.spm",
"target_spm": "target.spm",
"vocab": "vocab.json",
"tokenizer_config_file": "tokenizer_config.json",
}
PRETRAINED_VOCAB_FILES_MAP = {
"source_spm": {
"Helsinki-NLP/opus-mt-en-de": "https://huggingface.co/Helsinki-NLP/opus-mt-en-de/resolve/main/source.spm"
},
"target_spm": {
"Helsinki-NLP/opus-mt-en-de": "https://huggingface.co/Helsinki-NLP/opus-mt-en-de/resolve/main/target.spm"
},
"vocab": {
"Helsinki-NLP/opus-mt-en-de": "https://huggingface.co/Helsinki-NLP/opus-mt-en-de/resolve/main/vocab.json"
},
"tokenizer_config_file": {
"Helsinki-NLP/opus-mt-en-de": "https://huggingface.co/Helsinki-NLP/opus-mt-en-de/resolve/main/tokenizer_config.json"
},
}
PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES = {"Helsinki-NLP/opus-mt-en-de": 512}
PRETRAINED_INIT_CONFIGURATION = {}
# Example URL https://huggingface.co/Helsinki-NLP/opus-mt-en-de/resolve/main/vocab.json
[docs]class MarianTokenizer(PreTrainedTokenizer):
r"""
Construct a Marian tokenizer. Based on `SentencePiece <https://github.com/google/sentencepiece>`__.
This tokenizer inherits from :class:`~transformers.PreTrainedTokenizer` which contains most of the main methods.
Users should refer to this superclass for more information regarding those methods.
Args:
source_spm (:obj:`str`):
`SentencePiece <https://github.com/google/sentencepiece>`__ file (generally has a .spm extension) that
contains the vocabulary for the source language.
target_spm (:obj:`str`):
`SentencePiece <https://github.com/google/sentencepiece>`__ file (generally has a .spm extension) that
contains the vocabulary for the target language.
source_lang (:obj:`str`, `optional`):
A string representing the source language.
target_lang (:obj:`str`, `optional`):
A string representing the target language.
unk_token (:obj:`str`, `optional`, defaults to :obj:`"<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.
eos_token (:obj:`str`, `optional`, defaults to :obj:`"</s>"`):
The end of sequence token.
pad_token (:obj:`str`, `optional`, defaults to :obj:`"<pad>"`):
The token used for padding, for example when batching sequences of different lengths.
model_max_length (:obj:`int`, `optional`, defaults to 512):
The maximum sentence length the model accepts.
additional_special_tokens (:obj:`List[str]`, `optional`, defaults to :obj:`["<eop>", "<eod>"]`):
Additional special tokens used by the tokenizer.
sp_model_kwargs (:obj:`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::
>>> from transformers import MarianTokenizer
>>> tokenizer = MarianTokenizer.from_pretrained('Helsinki-NLP/opus-mt-en-de')
>>> src_texts = [ "I am a small frog.", "Tom asked his teacher for advice."]
>>> tgt_texts = ["Ich bin ein kleiner Frosch.", "Tom bat seinen Lehrer um Rat."] # optional
>>> inputs = tokenizer(src_texts, return_tensors="pt", padding=True)
>>> with tokenizer.as_target_tokenizer():
... labels = tokenizer(tgt_texts, return_tensors="pt", padding=True)
>>> inputs["labels"] = labels["input_ids"]
# keys [input_ids, attention_mask, labels].
>>> outputs = model(**inputs) should work
"""
vocab_files_names = VOCAB_FILES_NAMES
pretrained_vocab_files_map = PRETRAINED_VOCAB_FILES_MAP
pretrained_init_configuration = PRETRAINED_INIT_CONFIGURATION
max_model_input_sizes = PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
model_input_names = ["input_ids", "attention_mask"]
language_code_re = re.compile(">>.+<<") # type: re.Pattern
def __init__(
self,
vocab,
source_spm,
target_spm,
source_lang=None,
target_lang=None,
unk_token="<unk>",
eos_token="</s>",
pad_token="<pad>",
model_max_length=512,
sp_model_kwargs: Optional[Dict[str, Any]] = None,
**kwargs
) -> None:
self.sp_model_kwargs = {} if sp_model_kwargs is None else sp_model_kwargs
super().__init__(
# bos_token=bos_token, unused. Start decoding with config.decoder_start_token_id
source_lang=source_lang,
target_lang=target_lang,
unk_token=unk_token,
eos_token=eos_token,
pad_token=pad_token,
model_max_length=model_max_length,
sp_model_kwargs=self.sp_model_kwargs,
**kwargs,
)
assert Path(source_spm).exists(), f"cannot find spm source {source_spm}"
self.encoder = load_json(vocab)
if self.unk_token not in self.encoder:
raise KeyError("<unk> token must be in vocab")
assert self.pad_token in self.encoder
self.decoder = {v: k for k, v in self.encoder.items()}
self.source_lang = source_lang
self.target_lang = target_lang
self.supported_language_codes: list = [k for k in self.encoder if k.startswith(">>") and k.endswith("<<")]
self.spm_files = [source_spm, target_spm]
# load SentencePiece model for pre-processing
self.spm_source = load_spm(source_spm, self.sp_model_kwargs)
self.spm_target = load_spm(target_spm, self.sp_model_kwargs)
self.current_spm = self.spm_source
# Multilingual target side: default to using first supported language code.
self._setup_normalizer()
def _setup_normalizer(self):
try:
from sacremoses import MosesPunctNormalizer
self.punc_normalizer = MosesPunctNormalizer(self.source_lang).normalize
except (ImportError, FileNotFoundError):
warnings.warn("Recommended: pip install sacremoses.")
self.punc_normalizer = lambda x: x
def normalize(self, x: str) -> str:
"""Cover moses empty string edge case. They return empty list for '' input!"""
return self.punc_normalizer(x) if x else ""
def _convert_token_to_id(self, token):
return self.encoder.get(token, self.encoder[self.unk_token])
def remove_language_code(self, text: str):
"""Remove language codes like >>fr<< before sentencepiece"""
match = self.language_code_re.match(text)
code: list = [match.group(0)] if match else []
return code, self.language_code_re.sub("", text)
def _tokenize(self, text: str) -> List[str]:
code, text = self.remove_language_code(text)
pieces = self.current_spm.encode(text, out_type=str)
return code + pieces
def _convert_id_to_token(self, index: int) -> str:
"""Converts an index (integer) in a token (str) using the decoder."""
return self.decoder.get(index, self.unk_token)
def batch_decode(self, sequences, **kwargs):
"""
Convert a list of lists of token ids into a list of strings by calling decode.
Args:
sequences (:obj:`Union[List[int], List[List[int]], np.ndarray, torch.Tensor, tf.Tensor]`):
List of tokenized input ids. Can be obtained using the ``__call__`` method.
skip_special_tokens (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to remove special tokens in the decoding.
clean_up_tokenization_spaces (:obj:`bool`, `optional`, defaults to :obj:`True`):
Whether or not to clean up the tokenization spaces.
use_source_tokenizer (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to use the source tokenizer to decode sequences (only applicable in sequence-to-sequence
problems).
kwargs (additional keyword arguments, `optional`):
Will be passed to the underlying model specific decode method.
Returns:
:obj:`List[str]`: The list of decoded sentences.
"""
return super().batch_decode(sequences, **kwargs)
def decode(self, token_ids, **kwargs):
"""
Converts a sequence of ids in a string, using the tokenizer and vocabulary with options to remove special
tokens and clean up tokenization spaces.
Similar to doing ``self.convert_tokens_to_string(self.convert_ids_to_tokens(token_ids))``.
Args:
token_ids (:obj:`Union[int, List[int], np.ndarray, torch.Tensor, tf.Tensor]`):
List of tokenized input ids. Can be obtained using the ``__call__`` method.
skip_special_tokens (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to remove special tokens in the decoding.
clean_up_tokenization_spaces (:obj:`bool`, `optional`, defaults to :obj:`True`):
Whether or not to clean up the tokenization spaces.
use_source_tokenizer (:obj:`bool`, `optional`, defaults to :obj:`False`):
Whether or not to use the source tokenizer to decode sequences (only applicable in sequence-to-sequence
problems).
kwargs (additional keyword arguments, `optional`):
Will be passed to the underlying model specific decode method.
Returns:
:obj:`str`: The decoded sentence.
"""
return super().decode(token_ids, **kwargs)
def convert_tokens_to_string(self, tokens: List[str]) -> str:
"""Uses source spm if _decode_use_source_tokenizer is True, and target spm otherwise"""
if self._decode_use_source_tokenizer:
return self.spm_source.DecodePieces(tokens)
else:
return self.spm_target.DecodePieces(tokens)
def build_inputs_with_special_tokens(self, token_ids_0, token_ids_1=None) -> List[int]:
"""Build model inputs from a sequence by appending eos_token_id."""
if token_ids_1 is None:
return token_ids_0 + [self.eos_token_id]
# We don't expect to process pairs, but leave the pair logic for API consistency
return token_ids_0 + token_ids_1 + [self.eos_token_id]
[docs] @contextmanager
def as_target_tokenizer(self):
"""
Temporarily sets the tokenizer for encoding the targets. Useful for tokenizer associated to
sequence-to-sequence models that need a slightly different processing for the labels.
"""
self.current_spm = self.spm_target
yield
self.current_spm = self.spm_source
@property
def vocab_size(self) -> int:
return len(self.encoder)
def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]:
save_dir = Path(save_directory)
assert save_dir.is_dir(), f"{save_directory} should be a directory"
save_json(
self.encoder,
save_dir / ((filename_prefix + "-" if filename_prefix else "") + self.vocab_files_names["vocab"]),
)
for orig, f in zip(["source.spm", "target.spm"], self.spm_files):
dest_path = save_dir / ((filename_prefix + "-" if filename_prefix else "") + Path(f).name)
if not dest_path.exists():
copyfile(f, save_dir / orig)
return tuple(
save_dir / ((filename_prefix + "-" if filename_prefix else "") + f) for f in self.vocab_files_names
)
def get_vocab(self) -> Dict:
vocab = self.encoder.copy()
vocab.update(self.added_tokens_encoder)
return vocab
def __getstate__(self) -> Dict:
state = self.__dict__.copy()
state.update({k: None for k in ["spm_source", "spm_target", "current_spm", "punc_normalizer"]})
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.spm_source, self.spm_target = (load_spm(f, self.sp_model_kwargs) for f in self.spm_files)
self.current_spm = self.spm_source
self._setup_normalizer()
def num_special_tokens_to_add(self, **unused):
"""Just EOS"""
return 1
def _special_token_mask(self, seq):
all_special_ids = set(self.all_special_ids) # call it once instead of inside list comp
all_special_ids.remove(self.unk_token_id) # <unk> is only sometimes special
return [1 if x in all_special_ids else 0 for x in seq]
def get_special_tokens_mask(
self, token_ids_0: List, token_ids_1: Optional[List] = None, already_has_special_tokens: bool = False
) -> List[int]:
"""Get list where entries are [1] if a token is [eos] or [pad] else 0."""
if already_has_special_tokens:
return self._special_token_mask(token_ids_0)
elif token_ids_1 is None:
return self._special_token_mask(token_ids_0) + [1]
else:
return self._special_token_mask(token_ids_0 + token_ids_1) + [1]
def load_spm(path: str, sp_model_kwargs: Dict[str, Any]) -> sentencepiece.SentencePieceProcessor:
spm = sentencepiece.SentencePieceProcessor(**sp_model_kwargs)
spm.Load(path)
return spm
def save_json(data, path: str) -> None:
with open(path, "w") as f:
json.dump(data, f, indent=2)
def load_json(path: str) -> Union[Dict, List]:
with open(path, "r") as f:
return json.load(f)