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README.md
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---
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library_name: keras-hub
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---
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library_name: keras-hub
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---
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### Model Overview
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⚠️ Whisper is currently only available via the `keras-hub-nightly` package. Use `pip install keras-hub-nightly` to try this model.
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A Whisper encoder-decoder network for speech.
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This class implements a Transformer-based encoder-decoder model as
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described in
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["Robust Speech Recognition via Large-Scale Weak Supervision"](https://arxiv.org/abs/2212.04356).
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It includes the embedding lookups and transformer layers, but not the head
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for predicting the next token.
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The default constructor gives a fully customizable, randomly initialized Whisper
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model with any number of layers, heads, and embedding dimensions. To load
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preset architectures and weights, use the `from_preset()` constructor.
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Disclaimer: Pre-trained models are provided on an "as is" basis, without
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warranties or conditions of any kind. The underlying model is provided by a
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third party and subject to a separate license, available
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[here](https://github.com/openai/whisper).
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__Arguments__
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- __vocabulary_size__: int. The size of the token vocabulary.
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- __num_layers__: int. The number of transformer encoder layers and
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transformer decoder layers.
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- __num_heads__: int. The number of attention heads for each transformer.
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The hidden size must be divisible by the number of attention heads.
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- __hidden_dim__: int. The size of the transformer encoding and pooler layers.
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- __intermediate_dim__: int. The output dimension of the first Dense layer in
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a two-layer feedforward network for each transformer.
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- __num_mels__: int. The number of mel-frequency filters. Defaults to `80`.
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- __dropout__: float. Dropout probability for the Transformer encoder.
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- __max_encoder_sequence_length__: int. The maximum sequence length that the
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audio encoder can consume. Since the second convolutional layer in
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the encoder reduces the sequence length by half (stride of 2), we
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use `max_encoder_sequence_length // 2` as the sequence length for the
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positional embedding layer.
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- __max_decoder_sequence_length__: int. The maximum sequence length that the
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text decoder can consume.
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### Example Usage
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```python
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import keras_hub
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import keras_core as keras
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import numpy as np
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```
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```python
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input_data = {
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"encoder_features": np.ones(shape=(1, 12, 80), dtype="int32"),
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"decoder_token_ids": np.ones(shape=(1, 12), dtype="int32"),
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"decoder_padding_mask": np.array(
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[[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0]]
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),
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}
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# Randomly initialized Whisper encoder-decoder model with a custom config.
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model = keras_hub.models.WhisperBackbone(
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vocabulary_size=51864,
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num_layers=4,
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num_heads=4,
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hidden_dim=256,
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intermediate_dim=512,
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max_encoder_sequence_length=128,
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max_decoder_sequence_length=128,
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)
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model(input_data)
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```
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## Example Usage with Hugging Face URI
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```python
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import keras_hub
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import keras_core as keras
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import numpy as np
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```
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```python
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input_data = {
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"encoder_features": np.ones(shape=(1, 12, 80), dtype="int32"),
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"decoder_token_ids": np.ones(shape=(1, 12), dtype="int32"),
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"decoder_padding_mask": np.array(
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[[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0]]
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),
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}
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# Randomly initialized Whisper encoder-decoder model with a custom config.
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model = keras_hub.models.WhisperBackbone(
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vocabulary_size=51864,
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num_layers=4,
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num_heads=4,
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hidden_dim=256,
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intermediate_dim=512,
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max_encoder_sequence_length=128,
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max_decoder_sequence_length=128,
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)
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model(input_data)
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```
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