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transformers/docs/source/en/internal/tokenization_utils.md

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+
+# Utilities for Tokenizers
+
+This page lists all the utility functions used by the tokenizers, mainly the class
+[`~tokenization_utils_base.PreTrainedTokenizerBase`] that implements the common methods between
+[`PreTrainedTokenizer`] and [`PreTrainedTokenizerFast`] and the mixin
+[`~tokenization_utils_base.SpecialTokensMixin`].
+
+Most of those are only useful if you are studying the code of the tokenizers in the library.
+
+## 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