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Update README.md with new model card content
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README.md
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library_name: keras-hub
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---
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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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ALBERT encoder network.
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This class implements a bi-directional Transformer-based encoder as
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described in
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["ALBERT: A Lite BERT for Self-supervised Learning of Language Representations"](https://arxiv.org/abs/1909.11942).
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ALBERT is a more efficient variant of BERT, and uses parameter reduction
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techniques such as cross-layer parameter sharing and factorized embedding
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parameterization. This model class includes the embedding lookups and
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transformer layers, but not the masked language model or sentence order
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prediction heads.
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The default constructor gives a fully customizable, randomly initialized
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ALBERT encoder with any number of layers, heads, and embedding dimensions.
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To load 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.
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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, must be divisible by `num_groups`. The number of
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"virtual" layers, i.e., the total number of times the input sequence
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will be fed through the groups in one forward pass. The input will
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be routed to the correct group based on the layer index.
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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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- __embedding_dim__: int. The size of the embeddings.
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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_groups__: int. Number of groups, with each group having
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`num_inner_repetitions` number of `TransformerEncoder` layers.
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- __num_inner_repetitions__: int. Number of `TransformerEncoder` layers per
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group.
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- __dropout__: float. Dropout probability for the Transformer encoder.
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- __max_sequence_length__: int. The maximum sequence length that this encoder
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can consume. If None, `max_sequence_length` uses the value from
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sequence length. This determines the variable shape for positional
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embeddings.
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- __num_segments__: int. The number of types that the 'segment_ids' input can
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take.
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### Example Usage
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```python
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import keras
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import keras_hub
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import numpy as np
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```
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Raw string data.
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```python
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features = ["The quick brown fox jumped.", "I forgot my homework."]
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labels = [0, 3]
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# Pretrained classifier.
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classifier = keras_hub.models.AlbertClassifier.from_preset(
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"albert_extra_large_en_uncased",
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num_classes=4,
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)
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classifier.fit(x=features, y=labels, batch_size=2)
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classifier.predict(x=features, batch_size=2)
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# Re-compile (e.g., with a new learning rate).
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classifier.compile(
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loss=keras.losses.SparseCategoricalCrossentropy(from_logits=True),
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optimizer=keras.optimizers.Adam(5e-5),
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jit_compile=True,
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)
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# Access backbone programmatically (e.g., to change `trainable`).
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classifier.backbone.trainable = False
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# Fit again.
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classifier.fit(x=features, y=labels, batch_size=2)
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```
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Preprocessed integer data.
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```python
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features = {
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"token_ids": np.ones(shape=(2, 12), dtype="int32"),
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"segment_ids": np.array([[0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0]] * 2),
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"padding_mask": np.array([[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0]] * 2),
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}
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labels = [0, 3]
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# Pretrained classifier without preprocessing.
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classifier = keras_hub.models.AlbertClassifier.from_preset(
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"albert_extra_large_en_uncased",
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num_classes=4,
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preprocessor=None,
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)
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classifier.fit(x=features, y=labels, batch_size=2)
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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
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import keras_hub
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import numpy as np
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```
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Raw string data.
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```python
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features = ["The quick brown fox jumped.", "I forgot my homework."]
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labels = [0, 3]
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# Pretrained classifier.
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classifier = keras_hub.models.AlbertClassifier.from_preset(
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"hf://keras/albert_extra_large_en_uncased",
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num_classes=4,
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)
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classifier.fit(x=features, y=labels, batch_size=2)
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classifier.predict(x=features, batch_size=2)
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# Re-compile (e.g., with a new learning rate).
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classifier.compile(
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loss=keras.losses.SparseCategoricalCrossentropy(from_logits=True),
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optimizer=keras.optimizers.Adam(5e-5),
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jit_compile=True,
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)
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# Access backbone programmatically (e.g., to change `trainable`).
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classifier.backbone.trainable = False
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# Fit again.
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classifier.fit(x=features, y=labels, batch_size=2)
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```
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Preprocessed integer data.
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```python
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features = {
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"token_ids": np.ones(shape=(2, 12), dtype="int32"),
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"segment_ids": np.array([[0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0]] * 2),
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"padding_mask": np.array([[1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0]] * 2),
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}
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labels = [0, 3]
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# Pretrained classifier without preprocessing.
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classifier = keras_hub.models.AlbertClassifier.from_preset(
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"hf://keras/albert_extra_large_en_uncased",
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num_classes=4,
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preprocessor=None,
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)
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classifier.fit(x=features, y=labels, batch_size=2)
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```
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