Điều chỉnh phân phối với Gemma bằng Keras

# If you are using Kaggle, you don't need to login again.
!pip install ipywidgets
import kagglehub

kagglehub.login()

VBox(children=(HTML(value='<center> <img\nsrc=https://www.kaggle.com/static/images/site-logo.png\nalt=\'Kaggle…

pip install -q -U keras-nlp
# Work around an import error with tensorflow-hub. The library is not used.
pip install -q -U tensorflow-hub
# Install tensorflow-cpu so tensorflow does not attempt to access the TPU.
pip install -q -U tensorflow-cpu tensorflow-text
# Install keras 3 last. See https://keras.io/getting_started for details.
pip install -q -U keras

import jax

jax.devices()

[TpuDevice(id=0, process_index=0, coords=(0,0,0), core_on_chip=0),
 TpuDevice(id=1, process_index=0, coords=(0,0,0), core_on_chip=1),
 TpuDevice(id=2, process_index=0, coords=(1,0,0), core_on_chip=0),
 TpuDevice(id=3, process_index=0, coords=(1,0,0), core_on_chip=1),
 TpuDevice(id=4, process_index=0, coords=(0,1,0), core_on_chip=0),
 TpuDevice(id=5, process_index=0, coords=(0,1,0), core_on_chip=1),
 TpuDevice(id=6, process_index=0, coords=(1,1,0), core_on_chip=0),
 TpuDevice(id=7, process_index=0, coords=(1,1,0), core_on_chip=1)]

import os

# The Keras 3 distribution API is only implemented for the JAX backend for now
os.environ["KERAS_BACKEND"] = "jax"
# Pre-allocate 90% of TPU memory to minimize memory fragmentation and allocation
# overhead
os.environ["XLA_PYTHON_CLIENT_MEM_FRACTION"] = "0.9"

import keras
import keras_nlp

# Uncomment the line below if you want to enable mixed precision training on GPUs
# keras.mixed_precision.set_global_policy('mixed_bfloat16')

# Create a device mesh with (1, 8) shape so that the weights are sharded across
# all 8 TPUs.
device_mesh = keras.distribution.DeviceMesh(
    (1, 8),
    ["batch", "model"],
    devices=keras.distribution.list_devices())

model_dim = "model"

layout_map = keras.distribution.LayoutMap(device_mesh)

# Weights that match 'token_embedding/embeddings' will be sharded on 8 TPUs
layout_map["token_embedding/embeddings"] = (model_dim, None)
# Regex to match against the query, key and value matrices in the decoder
# attention layers
layout_map["decoder_block.*attention.*(query|key|value).*kernel"] = (
    model_dim, None, None)

layout_map["decoder_block.*attention_output.*kernel"] = (
    model_dim, None, None)
layout_map["decoder_block.*ffw_gating.*kernel"] = (None, model_dim)
layout_map["decoder_block.*ffw_linear.*kernel"] = (model_dim, None)

model_parallel = keras.distribution.ModelParallel(
    layout_map=layout_map, batch_dim_name="batch")

keras.distribution.set_distribution(model_parallel)
gemma_lm = keras_nlp.models.GemmaCausalLM.from_preset("gemma_7b_en")

Attaching 'config.json' from model 'keras/gemma/keras/gemma_7b_en/1' to your Kaggle notebook...
Attaching 'config.json' from model 'keras/gemma/keras/gemma_7b_en/1' to your Kaggle notebook...
Attaching 'model.weights.h5' from model 'keras/gemma/keras/gemma_7b_en/1' to your Kaggle notebook...
Attaching 'tokenizer.json' from model 'keras/gemma/keras/gemma_7b_en/1' to your Kaggle notebook...
Attaching 'assets/tokenizer/vocabulary.spm' from model 'keras/gemma/keras/gemma_7b_en/1' to your Kaggle notebook...
normalizer.cc(51) LOG(INFO) precompiled_charsmap is empty. use identity normalization.

decoder_block_1 = gemma_lm.backbone.get_layer('decoder_block_1')
print(type(decoder_block_1))
for variable in decoder_block_1.weights:
  print(f'{variable.path:<58}  {str(variable.shape):<16}  {str(variable.value.sharding.spec)}')

<class 'keras_nlp.src.models.gemma.gemma_decoder_block.GemmaDecoderBlock'>
decoder_block_1/pre_attention_norm/scale                    (3072,)           PartitionSpec(None,)
decoder_block_1/attention/query/kernel                      (16, 3072, 256)   PartitionSpec(None, 'model', None)
decoder_block_1/attention/key/kernel                        (16, 3072, 256)   PartitionSpec(None, 'model', None)
decoder_block_1/attention/value/kernel                      (16, 3072, 256)   PartitionSpec(None, 'model', None)
decoder_block_1/attention/attention_output/kernel           (16, 256, 3072)   PartitionSpec(None, None, 'model')
decoder_block_1/pre_ffw_norm/scale                          (3072,)           PartitionSpec(None,)
decoder_block_1/ffw_gating/kernel                           (3072, 24576)     PartitionSpec('model', None)
decoder_block_1/ffw_gating_2/kernel                         (3072, 24576)     PartitionSpec('model', None)
decoder_block_1/ffw_linear/kernel                           (24576, 3072)     PartitionSpec(None, 'model')

gemma_lm.generate("Best comedy movies in the 90s ", max_length=64)

'Best comedy movies in the 90s 1. The Naked Gun 2½: The Smell of Fear (1991) 2. Wayne’s World (1992) 3. The Naked Gun 33⅓: The Final Insult (1994)'

import tensorflow_datasets as tfds

imdb_train = tfds.load(
    "imdb_reviews",
    split="train",
    as_supervised=True,
    batch_size=2,
)
# Drop labels.
imdb_train = imdb_train.map(lambda x, y: x)

imdb_train.unbatch().take(1).get_single_element().numpy()

Downloading and preparing dataset 80.23 MiB (download: 80.23 MiB, generated: Unknown size, total: 80.23 MiB) to /root/tensorflow_datasets/imdb_reviews/plain_text/1.0.0...
Dl Completed...: 0 url [00:00, ? url/s]
Dl Size...: 0 MiB [00:00, ? MiB/s]
Generating splits...:   0%|          | 0/3 [00:00<?, ? splits/s]
Generating train examples...:   0%|          | 0/25000 [00:00<?, ? examples/s]
Shuffling /root/tensorflow_datasets/imdb_reviews/plain_text/1.0.0.incompleteAJDUZT/imdb_reviews-train.tfrecord…
Generating test examples...:   0%|          | 0/25000 [00:00<?, ? examples/s]
Shuffling /root/tensorflow_datasets/imdb_reviews/plain_text/1.0.0.incompleteAJDUZT/imdb_reviews-test.tfrecord*…
Generating unsupervised examples...:   0%|          | 0/50000 [00:00<?, ? examples/s]
Shuffling /root/tensorflow_datasets/imdb_reviews/plain_text/1.0.0.incompleteAJDUZT/imdb_reviews-unsupervised.t…
Dataset imdb_reviews downloaded and prepared to /root/tensorflow_datasets/imdb_reviews/plain_text/1.0.0. Subsequent calls will reuse this data.
b"This was an absolutely terrible movie. Don't be lured in by Christopher Walken or Michael Ironside. Both are great actors, but this must simply be their worst role in history. Even their great acting could not redeem this movie's ridiculous storyline. This movie is an early nineties US propaganda piece. The most pathetic scenes were those when the Columbian rebels were making their cases for revolutions. Maria Conchita Alonso appeared phony, and her pseudo-love affair with Walken was nothing but a pathetic emotional plug in a movie that was devoid of any real meaning. I am disappointed that there are movies like this, ruining actor's like Christopher Walken's good name. I could barely sit through it."

# Use a subset of the dataset for faster training.
imdb_train = imdb_train.take(2000)

# Enable LoRA for the model and set the LoRA rank to 4.
gemma_lm.backbone.enable_lora(rank=4)

# Fine-tune on the IMDb movie reviews dataset.

# Limit the input sequence length to 128 to control memory usage.
gemma_lm.preprocessor.sequence_length = 128
# Use AdamW (a common optimizer for transformer models).
optimizer = keras.optimizers.AdamW(
    learning_rate=5e-5,
    weight_decay=0.01,
)
# Exclude layernorm and bias terms from decay.
optimizer.exclude_from_weight_decay(var_names=["bias", "scale"])

gemma_lm.compile(
    loss=keras.losses.SparseCategoricalCrossentropy(from_logits=True),
    optimizer=optimizer,
    weighted_metrics=[keras.metrics.SparseCategoricalAccuracy()],
)
gemma_lm.summary()
gemma_lm.fit(imdb_train, epochs=1)

/usr/local/lib/python3.10/site-packages/jax/_src/interpreters/mlir.py:756: UserWarning: Some donated buffers were not usable: ShapedArray(float32[256000,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), 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ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,384,256]), ShapedArray(float32[16,256,384]), ShapedArray(float32[384,24576]), ShapedArray(float32[384,24576]), ShapedArray(float32[24576,384]), ShapedArray(float32[16,384,256]), 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See an explanation at https://jax.readthedocs.io/en/latest/faq.html#buffer_donation.
  warnings.warn("Some donated buffers were not usable:"
2000/2000 ━━━━━━━━━━━━━━━━━━━━ 358s 163ms/step - loss: 2.7145 - sparse_categorical_accuracy: 0.4329
<keras.src.callbacks.history.History at 0x7e9cac7f41c0>

gemma_lm.generate("Best comedy movies in the 90s ", max_length=64)

"Best comedy movies in the 90s \n\nThis is the movie that made me want to be a director. It's a great movie, and it's still funny today. The acting is superb, the writing is excellent, the music is perfect for the movie, and the story is great."