Bingsu / ko_BBPE_tokenizer_roberta

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Introduction of ko_BBPE_tokenizer_roberta

Model Details of ko_BBPE_tokenizer_roberta

라이브러리 버전
  • transformers: 4.21.1
  • datasets: 2.4.0
  • tokenizers: 0.12.1
훈련 코드
from datasets import load_dataset
from tokenizers import ByteLevelBPETokenizer

tokenizer = ByteLevelBPETokenizer(unicode_normalizer="nfkc", trim_offsets=True)
ds = load_dataset("Bingsu/my-korean-training-corpus", use_auth_token=True)
# 공개된 데이터를 사용할 경우
# ds = load_dataset("cc100", lang="ko")  # 50GB


# 이 데이터는 35GB이고, 데이터가 너무 많으면 컴퓨터가 터져서 일부만 사용했습니다.
ds_sample = ds["train"].train_test_split(0.35, seed=20220819)["test"]


def gen_text(batch_size: int = 5000):
    for i in range(0, len(ds_sample), batch_size):
        yield ds_sample[i : i + batch_size]["text"]


tokenizer.train_from_iterator(
    gen_text(),
    vocab_size=50265,  # roberta-base와 같은 크기
    min_frequency=2,
    special_tokens=[
        "<s>",
        "<pad>",
        "</s>",
        "<unk>",
        "<mask>",
    ],
)
tokenizer.save("my_tokenizer.json")

약 7시간 소모 (i5-12600 non-k) image

이후 토크나이저의 post-processor를 RobertaProcessing으로 교체합니다.

from tokenizers import Tokenizer
from tokenizers.processors import RobertaProcessing

tokenizer = Tokenizer.from_file("my_tokenizer.json")
tokenizer.post_processor = RobertaProcessing(
    ("</s>", tokenizer.token_to_id("</s>")),
    ("<s>", tokenizer.token_to_id("<s>")),
    add_prefix_space=False,
)

tokenizer.save("my_tokenizer2.json")

add_prefix_space=False 옵션은 roberta-base 를 그대로 따라하기 위한 것입니다.

그리고 model_max_length 설정을 해주었습니다.

from transformers import RobertaTokenizerFast

rt = RobertaTokenizerFast(tokenizer_file="tokenizer.json")
rt.save_pretrained("./my_roberta_tokenizer")

저장된 폴더의 tokenizer_config.json 파일에 "model_max_length": 512, 를 추가.

사용법
1.
from transformers import AutoTokenizer

tokenizer = AutoTokenizer.from_pretrained("Bingsu/BBPE_tokenizer_test")

# tokenizer는 RobertaTokenizerFast 클래스가 됩니다.
2.

tokenizer.json 파일을 먼저 다운받습니다.

from transformers import BartTokenizerFast, BertTokenizerFast

bart_tokenizer = BartTokenizerFast(tokenizer_file="tokenizer.json")
bert_tokenizer = BertTokenizerFast(tokenizer_file="tokenizer.json")

roberta와 같이 BBPE를 사용한 bart는 물론이고 bert에도 불러올 수 있습니다. 다만 이렇게 불러왔을 경우, model_max_len이 지정이 되어있지 않으니 지정해야 합니다.

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