Qwen3Tokenizer

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Qwen3Tokenizer class

keras_hub.models.Qwen3Tokenizer(vocabulary=None, merges=None, **kwargs)

Tokenizer for Qwen3 models.

This tokenizer implements byte-pair encoding (BPE) for Qwen3 models, handling special tokens like BOS (beginning of sequence) and EOS (end of sequence).

Arguments

• vocabulary: Dictionary mapping tokens to token IDs, or path to vocabulary file.
• merges: List of BPE merges, or path to merges file.
• bos_token: Beginning of sequence token. Defaults to None.
• eos_token: End of sequence token. Defaults to "<|endoftext|>".
• misc_special_tokens: Set of additional special tokens. Defaults to empty set.

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from_preset method

Qwen3Tokenizer.from_preset(preset, config_file="tokenizer.json", **kwargs)

Instantiate a keras_hub.models.Tokenizer from a model preset.

A preset is a directory of configs, weights and other file assets used to save and load a pre-trained model. The preset can be passed as one of:

1. a built-in preset identifier like 'bert_base_en'
2. a Kaggle Models handle like 'kaggle://user/bert/keras/bert_base_en'
3. a Hugging Face handle like 'hf://user/bert_base_en'
4. a path to a local preset directory like './bert_base_en'

For any Tokenizer subclass, you can run cls.presets.keys() to list all built-in presets available on the class.

This constructor can be called in one of two ways. Either from the base class like keras_hub.models.Tokenizer.from_preset(), or from a model class like keras_hub.models.GemmaTokenizer.from_preset(). If calling from the base class, the subclass of the returning object will be inferred from the config in the preset directory.

Arguments

• preset: string. A built-in preset identifier, a Kaggle Models handle, a Hugging Face handle, or a path to a local directory.
• load_weights: bool. If True, the weights will be loaded into the model architecture. If False, the weights will be randomly initialized.

Examples

# Load a preset tokenizer.
tokenizer = keras_hub.tokenizer.Tokenizer.from_preset("bert_base_en")

# Tokenize some input.
tokenizer("The quick brown fox tripped.")

# Detokenize some input.
tokenizer.detokenize([5, 6, 7, 8, 9])