CLIPPreprocessor

[source]

CLIPPreprocessor class

keras_hub.models.CLIPPreprocessor(
    tokenizer,
    sequence_length=77,
    add_start_token=True,
    add_end_token=True,
    to_lower=True,
    **kwargs
)

CLIP preprocessing layer which tokenizes and packs inputs.

This preprocessing layer will do 2 things:

• Tokenize the inputs using the tokenizer.
• Construct a dictionary with keys "token_ids", "padding_mask".

This layer can be used directly with tf.data.Dataset.map to preprocess string data in the (x, y, sample_weight) format used by keras.Model.fit.

The call method of this layer accepts three arguments, x, y, and sample_weight. x can be a python string or tensor representing a single segment, a list of python strings representing a batch of single segments, or a list of tensors representing multiple segments to be packed together. y and sample_weight are both optional, can have any format, and will be passed through unaltered.

CLIPPreprocessor forces the input to have only one segment, as CLIP is mainly used for generation tasks. For tasks having multi-segment inputs like "glue/mnli", please use a model designed for classification purposes such as BERT or RoBERTa.

Arguments

• tokenizer: A keras_hub.models.CLIPTokenizer instance.
• sequence_length: The length of the packed inputs.
• add_start_token: If True, the preprocessor will prepend the tokenizer start token to each input sequence.
• add_end_token: If True, the preprocessor will append the tokenizer end token to each input sequence.
• to_lower: bool. Whether to lower the inputs.

Call arguments

• x: A string, tf.Tensor or list of python strings.
• y: Any label data. Will be passed through unaltered.
• sample_weight: Any label weight data. Will be passed through unaltered.
• sequence_length: Pass to override the configured sequence_length of the layer.

[source]

from_preset method

CLIPPreprocessor.from_preset(preset, config_file="preprocessor.json", **kwargs)

Instantiate a keras_hub.models.Preprocessor 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 Preprocessor subclass, you can run cls.presets.keys() to list all built-in presets available on the class.

As there are usually multiple preprocessing classes for a given model, this method should be called on a specific subclass like keras_hub.models.BertTextClassifierPreprocessor.from_preset().

Arguments

• preset: string. A built-in preset identifier, a Kaggle Models handle, a Hugging Face handle, or a path to a local directory.

Examples

# Load a preprocessor for Gemma generation.
preprocessor = keras_hub.models.CausalLMPreprocessor.from_preset(
    "gemma_2b_en",
)

# Load a preprocessor for Bert classification.
preprocessor = keras_hub.models.TextClassifierPreprocessor.from_preset(
    "bert_base_en",
)

tokenizer property

keras_hub.models.CLIPPreprocessor.tokenizer

The tokenizer used to tokenize strings.