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Kerasによる分散トレーニング

TensorFlow.orgで表示

GoogleColabで実行

GitHubでソースを表示

ノートブックをダウンロードする

概要

tf.distribute.Strategy APIは、複数の処理ユニット間であなたのトレーニングを配布するための抽象化を提供します。これにより、最小限の変更で既存のモデルとトレーニングコードを使用して分散トレーニングを実行できます。

このチュートリアルでは、使用する方法を示しtf.distribute.MirroredStrategy一台のマシン上で多くのGPU上での同期の訓練で、グラフの複製を実行します。この戦略は基本的に、モデルのすべての変数を各プロセッサにコピーします。その後、それは使用して、すべての-減らすすべてのプロセッサからの勾配を組み合わせるために、モデルのすべてのコピーに結合された値が適用されます。

あなたは使用するtf.kerasモデルと構築するためのAPIをModel.fit 、それを訓練するため。（カスタムトレーニングループとを備えた分散訓練の詳細についてはMirroredStrategy 、チェックアウトこのチュートリアルを。）

MirroredStrategy単一のマシン上で複数のGPU上でモデルを訓練します。複数の労働者に多くのGPUの同期の訓練のために、使用tf.distribute.MultiWorkerMirroredStrategy Keras Model.fitでまたはカスタムトレーニングループ。その他のオプションについては、を参照してください分散トレーニングガイド。

他のさまざまな戦略について学ぶために、そこにあるTensorFlowを持つ分散型トレーニングガイド。

設定

import tensorflow_datasets as tfds
import tensorflow as tf

import os

# Load the TensorBoard notebook extension.
%load_ext tensorboard

2021-08-04 01:24:55.165631: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0

print(tf.__version__)

2.5.0

データセットをダウンロードする

MNISTデータセットロードTensorFlowデータセットを。これは、中のデータセットを返しtf.data形式を。

設定with_info引数Trueをここに保存されているデータセット全体のためのメタデータが含まれるinfo 。特に、このメタデータオブジェクトには、トレインとテストの例の数が含まれています。

datasets, info = tfds.load(name='mnist', with_info=True, as_supervised=True)

mnist_train, mnist_test = datasets['train'], datasets['test']

2021-08-04 01:25:00.048530: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcuda.so.1
2021-08-04 01:25:00.691099: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.691993: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1733] Found device 0 with properties: 
pciBusID: 0000:00:05.0 name: Tesla V100-SXM2-16GB computeCapability: 7.0
coreClock: 1.53GHz coreCount: 80 deviceMemorySize: 15.78GiB deviceMemoryBandwidth: 836.37GiB/s
2021-08-04 01:25:00.692033: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0
2021-08-04 01:25:00.695439: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcublas.so.11
2021-08-04 01:25:00.695536: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcublasLt.so.11
2021-08-04 01:25:00.696685: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcufft.so.10
2021-08-04 01:25:00.697009: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcurand.so.10
2021-08-04 01:25:00.698067: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcusolver.so.11
2021-08-04 01:25:00.698998: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcusparse.so.11
2021-08-04 01:25:00.699164: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudnn.so.8
2021-08-04 01:25:00.699264: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.700264: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.701157: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1871] Adding visible gpu devices: 0
2021-08-04 01:25:00.701928: I tensorflow/core/platform/cpu_feature_guard.cc:142] This TensorFlow binary is optimized with oneAPI Deep Neural Network Library (oneDNN) to use the following CPU instructions in performance-critical operations:  AVX2 AVX512F FMA
To enable them in other operations, rebuild TensorFlow with the appropriate compiler flags.
2021-08-04 01:25:00.702642: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.703535: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1733] Found device 0 with properties: 
pciBusID: 0000:00:05.0 name: Tesla V100-SXM2-16GB computeCapability: 7.0
coreClock: 1.53GHz coreCount: 80 deviceMemorySize: 15.78GiB deviceMemoryBandwidth: 836.37GiB/s
2021-08-04 01:25:00.703621: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.704507: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:00.705349: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1871] Adding visible gpu devices: 0
2021-08-04 01:25:00.705388: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudart.so.11.0
2021-08-04 01:25:01.356483: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1258] Device interconnect StreamExecutor with strength 1 edge matrix:
2021-08-04 01:25:01.356521: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1264]      0 
2021-08-04 01:25:01.356530: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1277] 0:   N 
2021-08-04 01:25:01.356777: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:01.357792: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:01.358756: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:937] successful NUMA node read from SysFS had negative value (-1), but there must be at least one NUMA node, so returning NUMA node zero
2021-08-04 01:25:01.359641: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1418] Created TensorFlow device (/job:localhost/replica:0/task:0/device:GPU:0 with 14646 MB memory) -> physical GPU (device: 0, name: Tesla V100-SXM2-16GB, pci bus id: 0000:00:05.0, compute capability: 7.0)

流通戦略を定義する

作成MirroredStrategyオブジェクトを。これは、ディストリビューションを処理し、コンテキストマネージャ（提供されますMirroredStrategy.scopeお使いのモデルの内部を構築するために）。

strategy = tf.distribute.MirroredStrategy()

WARNING:tensorflow:Collective ops is not configured at program startup. Some performance features may not be enabled.
WARNING:tensorflow:Collective ops is not configured at program startup. Some performance features may not be enabled.
INFO:tensorflow:Using MirroredStrategy with devices ('/job:localhost/replica:0/task:0/device:GPU:0',)
INFO:tensorflow:Using MirroredStrategy with devices ('/job:localhost/replica:0/task:0/device:GPU:0',)

print('Number of devices: {}'.format(strategy.num_replicas_in_sync))

Number of devices: 1

入力パイプラインを設定します

複数のGPUを使用してモデルをトレーニングする場合、バッチサイズを増やすことで、追加の計算能力を効果的に使用できます。一般に、GPUメモリに適合する最大のバッチサイズを使用し、それに応じて学習率を調整します。

# You can also do info.splits.total_num_examples to get the total
# number of examples in the dataset.

num_train_examples = info.splits['train'].num_examples
num_test_examples = info.splits['test'].num_examples

BUFFER_SIZE = 10000

BATCH_SIZE_PER_REPLICA = 64
BATCH_SIZE = BATCH_SIZE_PER_REPLICA * strategy.num_replicas_in_sync

画像ピクセル値を正規化関数定義[0, 255]の範囲[0, 1]範囲（特徴スケーリング）。

def scale(image, label):
  image = tf.cast(image, tf.float32)
  image /= 255

  return image, label

この適用scale訓練と試験データに関数を、次に使用tf.data.Datasetトレーニングデータ（シャッフルするAPIをDataset.shuffle 、それは（）、およびバッチDataset.batch ）。あなたは、パフォーマンス（向上させるためにトレーニングデータのメモリ内キャッシュを維持していることに注意してくださいDataset.cache ）。

train_dataset = mnist_train.map(scale).cache().shuffle(BUFFER_SIZE).batch(BATCH_SIZE)
eval_dataset = mnist_test.map(scale).batch(BATCH_SIZE)

モデルを作成する

文脈でKerasモデルを作成し、コンパイルしStrategy.scope ：

with strategy.scope():
  model = tf.keras.Sequential([
      tf.keras.layers.Conv2D(32, 3, activation='relu', input_shape=(28, 28, 1)),
      tf.keras.layers.MaxPooling2D(),
      tf.keras.layers.Flatten(),
      tf.keras.layers.Dense(64, activation='relu'),
      tf.keras.layers.Dense(10)
  ])

  model.compile(loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),
                optimizer=tf.keras.optimizers.Adam(),
                metrics=['accuracy'])

INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).

コールバックを定義する

以下の定義tf.keras.callbacks ：

tf.keras.callbacks.TensorBoard ：あなたは、グラフを視覚化することができますTensorBoard、ログを書き込みます。
tf.keras.callbacks.ModelCheckpoint ：そのようなすべてのエポックの後のように、特定の周波数でモデルを保存します。
tf.keras.callbacks.LearningRateScheduler ：スケジュールは学習率は、例えば、後のすべてのエポック/バッチを変更します。

例示的な目的のために、と呼ばれるカスタムコールバックを追加PrintLRノートブックの学習率を表示します。

# Define the checkpoint directory to store the checkpoints.
checkpoint_dir = './training_checkpoints'
# Define the name of the checkpoint files.
checkpoint_prefix = os.path.join(checkpoint_dir, "ckpt_{epoch}")

# Define a function for decaying the learning rate.
# You can define any decay function you need.
def decay(epoch):
  if epoch < 3:
    return 1e-3
  elif epoch >= 3 and epoch < 7:
    return 1e-4
  else:
    return 1e-5

# Define a callback for printing the learning rate at the end of each epoch.
class PrintLR(tf.keras.callbacks.Callback):
  def on_epoch_end(self, epoch, logs=None):
    print('\nLearning rate for epoch {} is {}'.format(epoch + 1,
                                                      model.optimizer.lr.numpy()))

# Put all the callbacks together.
callbacks = [
    tf.keras.callbacks.TensorBoard(log_dir='./logs'),
    tf.keras.callbacks.ModelCheckpoint(filepath=checkpoint_prefix,
                                       save_weights_only=True),
    tf.keras.callbacks.LearningRateScheduler(decay),
    PrintLR()
]

2021-08-04 01:25:02.054144: I tensorflow/core/profiler/lib/profiler_session.cc:126] Profiler session initializing.
2021-08-04 01:25:02.054179: I tensorflow/core/profiler/lib/profiler_session.cc:141] Profiler session started.
2021-08-04 01:25:02.054232: I tensorflow/core/profiler/internal/gpu/cupti_tracer.cc:1611] Profiler found 1 GPUs
2021-08-04 01:25:02.098001: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcupti.so.11.2
2021-08-04 01:25:02.288095: I tensorflow/core/profiler/lib/profiler_session.cc:159] Profiler session tear down.
2021-08-04 01:25:02.292220: I tensorflow/core/profiler/internal/gpu/cupti_tracer.cc:1743] CUPTI activity buffer flushed

トレーニングと評価

さて、呼び出すことによって、通常の方法でモデルをトレーニングModel.fitモデルにし、チュートリアルの最初に作成されたデータセットに渡します。この手順は、トレーニングを配布するかどうかに関係なく同じです。

EPOCHS = 12

model.fit(train_dataset, epochs=EPOCHS, callbacks=callbacks)

2021-08-04 01:25:02.342811: W tensorflow/core/grappler/optimizers/data/auto_shard.cc:461] The `assert_cardinality` transformation is currently not handled by the auto-shard rewrite and will be removed.
2021-08-04 01:25:02.389307: I tensorflow/compiler/mlir/mlir_graph_optimization_pass.cc:176] None of the MLIR Optimization Passes are enabled (registered 2)
2021-08-04 01:25:02.389734: I tensorflow/core/platform/profile_utils/cpu_utils.cc:114] CPU Frequency: 2000179999 Hz
Epoch 1/12
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
INFO:tensorflow:Reduce to /job:localhost/replica:0/task:0/device:CPU:0 then broadcast to ('/job:localhost/replica:0/task:0/device:CPU:0',).
2021-08-04 01:25:05.851687: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcudnn.so.8
2021-08-04 01:25:07.965516: I tensorflow/stream_executor/cuda/cuda_dnn.cc:359] Loaded cuDNN version 8100
2021-08-04 01:25:13.166255: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcublas.so.11
2021-08-04 01:25:13.566160: I tensorflow/stream_executor/platform/default/dso_loader.cc:53] Successfully opened dynamic library libcublasLt.so.11
1/938 [..............................] - ETA: 3:09:47 - loss: 2.2850 - accuracy: 0.1094
2021-08-04 01:25:14.615346: I tensorflow/core/profiler/lib/profiler_session.cc:126] Profiler session initializing.
2021-08-04 01:25:14.615388: I tensorflow/core/profiler/lib/profiler_session.cc:141] Profiler session started.
3/938 [..............................] - ETA: 4:21 - loss: 2.1694 - accuracy: 0.3333WARNING:tensorflow:Callback method `on_train_batch_begin` is slow compared to the batch time (batch time: 0.0045s vs `on_train_batch_begin` time: 0.0762s). Check your callbacks.
2021-08-04 01:25:15.082713: I tensorflow/core/profiler/lib/profiler_session.cc:66] Profiler session collecting data.
2021-08-04 01:25:15.085886: I tensorflow/core/profiler/internal/gpu/cupti_tracer.cc:1743] CUPTI activity buffer flushed
2021-08-04 01:25:15.122453: I tensorflow/core/profiler/internal/gpu/cupti_collector.cc:673]  GpuTracer has collected 96 callback api events and 93 activity events. 
2021-08-04 01:25:15.126946: I tensorflow/core/profiler/lib/profiler_session.cc:159] Profiler session tear down.
2021-08-04 01:25:15.138108: I tensorflow/core/profiler/rpc/client/save_profile.cc:137] Creating directory: ./logs/train/plugins/profile/2021_08_04_01_25_15
2021-08-04 01:25:15.146767: I tensorflow/core/profiler/rpc/client/save_profile.cc:143] Dumped gzipped tool data for trace.json.gz to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.trace.json.gz
2021-08-04 01:25:15.154434: I tensorflow/core/profiler/rpc/client/save_profile.cc:137] Creating directory: ./logs/train/plugins/profile/2021_08_04_01_25_15
2021-08-04 01:25:15.155169: I tensorflow/core/profiler/rpc/client/save_profile.cc:143] Dumped gzipped tool data for memory_profile.json.gz to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.memory_profile.json.gz
2021-08-04 01:25:15.155597: I tensorflow/core/profiler/rpc/client/capture_profile.cc:251] Creating directory: ./logs/train/plugins/profile/2021_08_04_01_25_15Dumped tool data for xplane.pb to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.xplane.pb
Dumped tool data for overview_page.pb to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.overview_page.pb
Dumped tool data for input_pipeline.pb to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.input_pipeline.pb
Dumped tool data for tensorflow_stats.pb to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.tensorflow_stats.pb
Dumped tool data for kernel_stats.pb to ./logs/train/plugins/profile/2021_08_04_01_25_15/kokoro-gcp-ubuntu-prod-1251741625.kernel_stats.pb

WARNING:tensorflow:Callback method `on_train_batch_begin` is slow compared to the batch time (batch time: 0.0045s vs `on_train_batch_begin` time: 0.0762s). Check your callbacks.
WARNING:tensorflow:Callback method `on_train_batch_end` is slow compared to the batch time (batch time: 0.0045s vs `on_train_batch_end` time: 0.0155s). Check your callbacks.
WARNING:tensorflow:Callback method `on_train_batch_end` is slow compared to the batch time (batch time: 0.0045s vs `on_train_batch_end` time: 0.0155s). Check your callbacks.
938/938 [==============================] - 16s 4ms/step - loss: 0.1997 - accuracy: 0.9421

Learning rate for epoch 1 is 0.0010000000474974513
Epoch 2/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0656 - accuracy: 0.9805

Learning rate for epoch 2 is 0.0010000000474974513
Epoch 3/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0461 - accuracy: 0.9857

Learning rate for epoch 3 is 0.0010000000474974513
Epoch 4/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0244 - accuracy: 0.9935

Learning rate for epoch 4 is 9.999999747378752e-05
Epoch 5/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0217 - accuracy: 0.9943

Learning rate for epoch 5 is 9.999999747378752e-05
Epoch 6/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0199 - accuracy: 0.9948

Learning rate for epoch 6 is 9.999999747378752e-05
Epoch 7/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0182 - accuracy: 0.9955

Learning rate for epoch 7 is 9.999999747378752e-05
Epoch 8/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0156 - accuracy: 0.9963

Learning rate for epoch 8 is 9.999999747378752e-06
Epoch 9/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0154 - accuracy: 0.9964

Learning rate for epoch 9 is 9.999999747378752e-06
Epoch 10/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0152 - accuracy: 0.9965

Learning rate for epoch 10 is 9.999999747378752e-06
Epoch 11/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0150 - accuracy: 0.9966

Learning rate for epoch 11 is 9.999999747378752e-06
Epoch 12/12
938/938 [==============================] - 3s 3ms/step - loss: 0.0149 - accuracy: 0.9967

Learning rate for epoch 12 is 9.999999747378752e-06
<tensorflow.python.keras.callbacks.History at 0x7f4e5c176dd0>

保存されたチェックポイントを確認します。

# Check the checkpoint directory.
ls {checkpoint_dir}

checkpoint           ckpt_4.data-00000-of-00001
ckpt_1.data-00000-of-00001   ckpt_4.index
ckpt_1.index             ckpt_5.data-00000-of-00001
ckpt_10.data-00000-of-00001  ckpt_5.index
ckpt_10.index            ckpt_6.data-00000-of-00001
ckpt_11.data-00000-of-00001  ckpt_6.index
ckpt_11.index            ckpt_7.data-00000-of-00001
ckpt_12.data-00000-of-00001  ckpt_7.index
ckpt_12.index            ckpt_8.data-00000-of-00001
ckpt_2.data-00000-of-00001   ckpt_8.index
ckpt_2.index             ckpt_9.data-00000-of-00001
ckpt_3.data-00000-of-00001   ckpt_9.index
ckpt_3.index

どれだけのモデルが実行を確認し、最新のチェックポイントと呼びロードするにはModel.evaluate試験データに：

model.load_weights(tf.train.latest_checkpoint(checkpoint_dir))

eval_loss, eval_acc = model.evaluate(eval_dataset)

print('Eval loss: {}, Eval accuracy: {}'.format(eval_loss, eval_acc))

2021-08-04 01:25:49.277864: W tensorflow/core/grappler/optimizers/data/auto_shard.cc:461] The `assert_cardinality` transformation is currently not handled by the auto-shard rewrite and will be removed.
157/157 [==============================] - 2s 4ms/step - loss: 0.0371 - accuracy: 0.9875
Eval loss: 0.03712465986609459, Eval accuracy: 0.987500011920929

出力を視覚化するには、TensorBoardを起動し、ログを表示します。

%tensorboard --logdir=logs

ls -sh ./logs

total 4.0K
4.0K train

SavedModelにエクスポート

使用して、プラットフォームに依存しないSavedModel形式にグラフや変数をエクスポートModel.save 。お使いのモデルが保存された後、あなたはの有無にかかわらず、それを読み込むことができStrategy.scope 。

path = 'saved_model/'

model.save(path, save_format='tf')

2021-08-04 01:25:51.983973: W tensorflow/python/util/util.cc:348] Sets are not currently considered sequences, but this may change in the future, so consider avoiding using them.
INFO:tensorflow:Assets written to: saved_model/assets
INFO:tensorflow:Assets written to: saved_model/assets

さて、なしモデルをロードStrategy.scope ：

unreplicated_model = tf.keras.models.load_model(path)

unreplicated_model.compile(
    loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),
    optimizer=tf.keras.optimizers.Adam(),
    metrics=['accuracy'])

eval_loss, eval_acc = unreplicated_model.evaluate(eval_dataset)

print('Eval loss: {}, Eval Accuracy: {}'.format(eval_loss, eval_acc))

157/157 [==============================] - 0s 2ms/step - loss: 0.0371 - accuracy: 0.9875
Eval loss: 0.03712465986609459, Eval Accuracy: 0.987500011920929

でモデルをロードStrategy.scope ：

with strategy.scope():
  replicated_model = tf.keras.models.load_model(path)
  replicated_model.compile(loss=tf.keras.losses.SparseCategoricalCrossentropy(from_logits=True),
                           optimizer=tf.keras.optimizers.Adam(),
                           metrics=['accuracy'])

  eval_loss, eval_acc = replicated_model.evaluate(eval_dataset)
  print ('Eval loss: {}, Eval Accuracy: {}'.format(eval_loss, eval_acc))

2021-08-04 01:25:53.544239: W tensorflow/core/grappler/optimizers/data/auto_shard.cc:461] The `assert_cardinality` transformation is currently not handled by the auto-shard rewrite and will be removed.
157/157 [==============================] - 2s 2ms/step - loss: 0.0371 - accuracy: 0.9875
Eval loss: 0.03712465986609459, Eval Accuracy: 0.987500011920929

追加のリソース

Kerasと異なる流通戦略を使用してより多くの例Model.fit API：

TPUのBERT使用GLUEタスク解決チュートリアル用途tf.distribute.MirroredStrategyのGPUとの訓練のためのtf.distribute.TPUStrategy -onのTPUを。
保存と流通戦略使用してモデルをロードする方法でSavedModel APIを使用するチュートリアルdemonstatesをtf.distribute.Strategy 。
公式TensorFlowモデルは、複数の流通戦略を実行するように設定することができます。

TensorFlow配布戦略の詳細については、以下をご覧ください。

tf.distribute.Strategyによるカスタムトレーニング方法を使用するチュートリアルショーtf.distribute.MirroredStrategyカスタムトレーニングループとシングル労働者の訓練のために。
Keras付きマルチ労働者のトレーニング方法を使用するチュートリアルショーMultiWorkerMirroredStrategyしModel.fit 。
KerasとMultiWorkerMirroredStrategyとカスタムトレーニングループチュートリアルショーがどのように使用するMultiWorkerMirroredStrategy Kerasと、カスタム・トレーニング・ループを。
TensorFlowの中に分散トレーニングガイドは、利用可能な流通戦略の概要を説明します。
tf.functionの持つ優れた性能ガイドは、以下のような他の戦略とツールに関する情報提供TensorFlowプロファイラあなたがTensorFlowモデルのパフォーマンスを最適化するために使用することができます。