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# Utilities for Tokenizers

このページには、トークナイザーによって使用されるすべてのユーティリティ関数 (主にクラス) がリストされます。
[`~tokenization_utils_base.PreTrainedTokenizerBase`] 間の共通メソッドを実装します。
[`PreTrainedTokenizer`] と [`PreTrainedTokenizerFast`] およびミックスイン
[`~tokenization_utils_base.SpecialTokensMixin`]。

これらのほとんどは、ライブラリ内のトークナイザーのコードを学習する場合にのみ役に立ちます。

## PreTrainedTokenizerBase

[[autodoc]] tokenization_utils_base.PreTrainedTokenizerBase
    - __call__
    - all

## SpecialTokensMixin

[[autodoc]] tokenization_utils_base.SpecialTokensMixin

## Enums and namedtuples

[[autodoc]] tokenization_utils_base.TruncationStrategy

[[autodoc]] tokenization_utils_base.CharSpan

[[autodoc]] tokenization_utils_base.TokenSpan