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Ringkasan
Keras Tuner adalah library yang membantu Anda memilih kumpulan hyperparameter yang optimal untuk program TensorFlow Anda. Proses pemilihan kumpulan hyperparameter yang tepat untuk aplikasi machine learning (ML) Anda disebut penyetelan hyperparameter atau hypertuning .
Hyperparameters adalah variabel yang mengatur proses pelatihan dan topologi model ML. Variabel ini tetap konstan selama proses pelatihan dan berdampak langsung pada kinerja program ML Anda. Hyperparameter terdiri dari dua jenis:
- Model hyperparameter yang mempengaruhi pemilihan model seperti jumlah dan lebar lapisan tersembunyi
- Hyperparameter algoritma yang mempengaruhi kecepatan dan kualitas algoritma pembelajaran seperti learning rate untuk Stochastic Gradient Descent (SGD) dan jumlah tetangga terdekat untuk ak Nearest Neighbors (KNN) classifier
Dalam tutorial ini, Anda akan menggunakan Keras Tuner untuk melakukan hypertuning untuk aplikasi klasifikasi gambar.
Mempersiapkan
import tensorflow as tf
from tensorflow import keras
Instal dan impor Keras Tuner.
pip install -q -U keras-tuner
import keras_tuner as kt
Unduh dan siapkan kumpulan datanya
Dalam tutorial ini, Anda akan menggunakan Keras Tuner untuk menemukan hyperparameter terbaik untuk model pembelajaran mesin yang mengklasifikasikan gambar pakaian dari dataset Fashion MNIST .
Muat datanya.
(img_train, label_train), (img_test, label_test) = keras.datasets.fashion_mnist.load_data()
# Normalize pixel values between 0 and 1
img_train = img_train.astype('float32') / 255.0
img_test = img_test.astype('float32') / 255.0
Tentukan modelnya
Saat Anda membangun model untuk hypertuning, Anda juga menentukan ruang pencarian hyperparameter selain arsitektur model. Model yang Anda siapkan untuk hypertuning disebut hypermodel .
Anda dapat mendefinisikan hypermodel melalui dua pendekatan:
- Dengan menggunakan fungsi pembuat model
- Dengan mensubklasifikasikan kelas
HyperModeldari Keras Tuner API
Anda juga dapat menggunakan dua kelas HyperModel yang telah ditentukan sebelumnya - HyperXception dan HyperResNet untuk aplikasi visi komputer.
Dalam tutorial ini, Anda menggunakan fungsi pembuat model untuk menentukan model klasifikasi gambar. Fungsi pembuat model mengembalikan model yang dikompilasi dan menggunakan hyperparameter yang Anda tentukan sebaris untuk menyempurnakan model.
def model_builder(hp):
model = keras.Sequential()
model.add(keras.layers.Flatten(input_shape=(28, 28)))
# Tune the number of units in the first Dense layer
# Choose an optimal value between 32-512
hp_units = hp.Int('units', min_value=32, max_value=512, step=32)
model.add(keras.layers.Dense(units=hp_units, activation='relu'))
model.add(keras.layers.Dense(10))
# Tune the learning rate for the optimizer
# Choose an optimal value from 0.01, 0.001, or 0.0001
hp_learning_rate = hp.Choice('learning_rate', values=[1e-2, 1e-3, 1e-4])
model.compile(optimizer=keras.optimizers.Adam(learning_rate=hp_learning_rate),
loss=keras.losses.SparseCategoricalCrossentropy(from_logits=True),
metrics=['accuracy'])
return model
Instansiasi tuner dan lakukan hypertuning
Instansiasi tuner untuk melakukan hypertuning. Keras Tuner memiliki empat tuner yang tersedia - RandomSearch , Hyperband , BayesianOptimization , dan Sklearn . Dalam tutorial ini, Anda menggunakan tuner Hyperband .
Untuk membuat instance tuner Hyperband, Anda harus menentukan hypermodel, objective untuk mengoptimalkan, dan jumlah maksimum epoch untuk dilatih ( max_epochs ).
tuner = kt.Hyperband(model_builder,
objective='val_accuracy',
max_epochs=10,
factor=3,
directory='my_dir',
project_name='intro_to_kt')
Algoritme penyetelan Hyperband menggunakan alokasi sumber daya adaptif dan penghentian awal untuk dengan cepat menyatu pada model berkinerja tinggi. Ini dilakukan dengan menggunakan braket gaya kejuaraan olahraga. Algoritme melatih sejumlah besar model untuk beberapa epoch dan hanya meneruskan separuh model dengan performa terbaik ke babak berikutnya. Hyperband menentukan jumlah model yang akan dilatih dalam braket dengan menghitung 1 + factor log ( max_epochs ) dan membulatkannya ke bilangan bulat terdekat.
Buat panggilan balik untuk menghentikan pelatihan lebih awal setelah mencapai nilai tertentu untuk kehilangan validasi.
stop_early = tf.keras.callbacks.EarlyStopping(monitor='val_loss', patience=5)
Jalankan pencarian hyperparameter. Argumen untuk metode pencarian sama dengan yang digunakan untuk tf.keras.model.fit selain callback di atas.
tuner.search(img_train, label_train, epochs=50, validation_split=0.2, callbacks=[stop_early])
# Get the optimal hyperparameters
best_hps=tuner.get_best_hyperparameters(num_trials=1)[0]
print(f"""
The hyperparameter search is complete. The optimal number of units in the first densely-connected
layer is {best_hps.get('units')} and the optimal learning rate for the optimizer
is {best_hps.get('learning_rate')}.
""")
Trial 30 Complete [00h 00m 35s] val_accuracy: 0.8925833106040955 Best val_accuracy So Far: 0.8925833106040955 Total elapsed time: 00h 07m 26s INFO:tensorflow:Oracle triggered exit The hyperparameter search is complete. The optimal number of units in the first densely-connected layer is 320 and the optimal learning rate for the optimizer is 0.001.
Latih modelnya
Temukan jumlah epoch yang optimal untuk melatih model dengan hyperparameter yang diperoleh dari pencarian.
# Build the model with the optimal hyperparameters and train it on the data for 50 epochs
model = tuner.hypermodel.build(best_hps)
history = model.fit(img_train, label_train, epochs=50, validation_split=0.2)
val_acc_per_epoch = history.history['val_accuracy']
best_epoch = val_acc_per_epoch.index(max(val_acc_per_epoch)) + 1
print('Best epoch: %d' % (best_epoch,))
Epoch 1/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.4988 - accuracy: 0.8232 - val_loss: 0.4142 - val_accuracy: 0.8517 Epoch 2/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.3717 - accuracy: 0.8646 - val_loss: 0.3437 - val_accuracy: 0.8773 Epoch 3/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.3317 - accuracy: 0.8779 - val_loss: 0.3806 - val_accuracy: 0.8639 Epoch 4/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.3079 - accuracy: 0.8867 - val_loss: 0.3321 - val_accuracy: 0.8801 Epoch 5/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2882 - accuracy: 0.8943 - val_loss: 0.3313 - val_accuracy: 0.8806 Epoch 6/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2727 - accuracy: 0.8977 - val_loss: 0.3152 - val_accuracy: 0.8857 Epoch 7/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2610 - accuracy: 0.9016 - val_loss: 0.3225 - val_accuracy: 0.8873 Epoch 8/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2474 - accuracy: 0.9060 - val_loss: 0.3198 - val_accuracy: 0.8867 Epoch 9/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2385 - accuracy: 0.9105 - val_loss: 0.3266 - val_accuracy: 0.8822 Epoch 10/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2295 - accuracy: 0.9142 - val_loss: 0.3382 - val_accuracy: 0.8835 Epoch 11/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2170 - accuracy: 0.9185 - val_loss: 0.3215 - val_accuracy: 0.8885 Epoch 12/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2102 - accuracy: 0.9202 - val_loss: 0.3194 - val_accuracy: 0.8923 Epoch 13/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2036 - accuracy: 0.9235 - val_loss: 0.3176 - val_accuracy: 0.8901 Epoch 14/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1955 - accuracy: 0.9272 - val_loss: 0.3269 - val_accuracy: 0.8912 Epoch 15/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1881 - accuracy: 0.9292 - val_loss: 0.3391 - val_accuracy: 0.8878 Epoch 16/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1821 - accuracy: 0.9321 - val_loss: 0.3272 - val_accuracy: 0.8920 Epoch 17/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1771 - accuracy: 0.9332 - val_loss: 0.3536 - val_accuracy: 0.8876 Epoch 18/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1697 - accuracy: 0.9363 - val_loss: 0.3395 - val_accuracy: 0.8927 Epoch 19/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1652 - accuracy: 0.9374 - val_loss: 0.3464 - val_accuracy: 0.8937 Epoch 20/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1606 - accuracy: 0.9392 - val_loss: 0.3576 - val_accuracy: 0.8888 Epoch 21/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1539 - accuracy: 0.9417 - val_loss: 0.3724 - val_accuracy: 0.8867 Epoch 22/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1503 - accuracy: 0.9435 - val_loss: 0.3607 - val_accuracy: 0.8954 Epoch 23/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1450 - accuracy: 0.9454 - val_loss: 0.3525 - val_accuracy: 0.8919 Epoch 24/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1398 - accuracy: 0.9473 - val_loss: 0.3745 - val_accuracy: 0.8919 Epoch 25/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1370 - accuracy: 0.9478 - val_loss: 0.3616 - val_accuracy: 0.8941 Epoch 26/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1334 - accuracy: 0.9498 - val_loss: 0.3866 - val_accuracy: 0.8956 Epoch 27/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1282 - accuracy: 0.9519 - val_loss: 0.3947 - val_accuracy: 0.8924 Epoch 28/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1254 - accuracy: 0.9538 - val_loss: 0.4223 - val_accuracy: 0.8870 Epoch 29/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1222 - accuracy: 0.9536 - val_loss: 0.3805 - val_accuracy: 0.8898 Epoch 30/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1179 - accuracy: 0.9546 - val_loss: 0.4052 - val_accuracy: 0.8942 Epoch 31/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1162 - accuracy: 0.9560 - val_loss: 0.3909 - val_accuracy: 0.8955 Epoch 32/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.1152 - accuracy: 0.9572 - val_loss: 0.4160 - val_accuracy: 0.8908 Epoch 33/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1100 - accuracy: 0.9583 - val_loss: 0.4280 - val_accuracy: 0.8938 Epoch 34/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1055 - accuracy: 0.9603 - val_loss: 0.4148 - val_accuracy: 0.8963 Epoch 35/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1044 - accuracy: 0.9606 - val_loss: 0.4302 - val_accuracy: 0.8921 Epoch 36/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1046 - accuracy: 0.9605 - val_loss: 0.4205 - val_accuracy: 0.8947 Epoch 37/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0993 - accuracy: 0.9621 - val_loss: 0.4551 - val_accuracy: 0.8875 Epoch 38/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0972 - accuracy: 0.9635 - val_loss: 0.4622 - val_accuracy: 0.8914 Epoch 39/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0951 - accuracy: 0.9642 - val_loss: 0.4423 - val_accuracy: 0.8950 Epoch 40/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0947 - accuracy: 0.9637 - val_loss: 0.4498 - val_accuracy: 0.8948 Epoch 41/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0876 - accuracy: 0.9675 - val_loss: 0.4694 - val_accuracy: 0.8959 Epoch 42/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0902 - accuracy: 0.9657 - val_loss: 0.4778 - val_accuracy: 0.8938 Epoch 43/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0876 - accuracy: 0.9676 - val_loss: 0.4716 - val_accuracy: 0.8911 Epoch 44/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0884 - accuracy: 0.9674 - val_loss: 0.4827 - val_accuracy: 0.8918 Epoch 45/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0764 - accuracy: 0.9715 - val_loss: 0.5008 - val_accuracy: 0.8953 Epoch 46/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0823 - accuracy: 0.9695 - val_loss: 0.5157 - val_accuracy: 0.8874 Epoch 47/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0789 - accuracy: 0.9704 - val_loss: 0.5198 - val_accuracy: 0.8910 Epoch 48/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0778 - accuracy: 0.9716 - val_loss: 0.5031 - val_accuracy: 0.8932 Epoch 49/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0747 - accuracy: 0.9718 - val_loss: 0.4982 - val_accuracy: 0.8953 Epoch 50/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0786 - accuracy: 0.9706 - val_loss: 0.5198 - val_accuracy: 0.8976 Best epoch: 50
Instansiasi ulang hypermodel dan latih dengan jumlah epoch yang optimal dari atas.
hypermodel = tuner.hypermodel.build(best_hps)
# Retrain the model
hypermodel.fit(img_train, label_train, epochs=best_epoch, validation_split=0.2)
Epoch 1/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.4987 - accuracy: 0.8236 - val_loss: 0.4065 - val_accuracy: 0.8488 Epoch 2/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.3738 - accuracy: 0.8652 - val_loss: 0.3847 - val_accuracy: 0.8613 Epoch 3/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.3344 - accuracy: 0.8775 - val_loss: 0.3568 - val_accuracy: 0.8750 Epoch 4/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.3065 - accuracy: 0.8865 - val_loss: 0.3326 - val_accuracy: 0.8811 Epoch 5/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2880 - accuracy: 0.8930 - val_loss: 0.3208 - val_accuracy: 0.8843 Epoch 6/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.2744 - accuracy: 0.8981 - val_loss: 0.3313 - val_accuracy: 0.8810 Epoch 7/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2585 - accuracy: 0.9019 - val_loss: 0.3352 - val_accuracy: 0.8790 Epoch 8/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2445 - accuracy: 0.9078 - val_loss: 0.3151 - val_accuracy: 0.8849 Epoch 9/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.2366 - accuracy: 0.9113 - val_loss: 0.3167 - val_accuracy: 0.8881 Epoch 10/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.2241 - accuracy: 0.9162 - val_loss: 0.3258 - val_accuracy: 0.8857 Epoch 11/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.2158 - accuracy: 0.9194 - val_loss: 0.3087 - val_accuracy: 0.8927 Epoch 12/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.2091 - accuracy: 0.9218 - val_loss: 0.3287 - val_accuracy: 0.8904 Epoch 13/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1998 - accuracy: 0.9243 - val_loss: 0.3131 - val_accuracy: 0.8950 Epoch 14/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1937 - accuracy: 0.9271 - val_loss: 0.3177 - val_accuracy: 0.8925 Epoch 15/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1859 - accuracy: 0.9303 - val_loss: 0.3334 - val_accuracy: 0.8918 Epoch 16/50 1500/1500 [==============================] - 4s 2ms/step - loss: 0.1779 - accuracy: 0.9334 - val_loss: 0.3299 - val_accuracy: 0.8929 Epoch 17/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1743 - accuracy: 0.9348 - val_loss: 0.3391 - val_accuracy: 0.8920 Epoch 18/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1687 - accuracy: 0.9366 - val_loss: 0.3302 - val_accuracy: 0.8974 Epoch 19/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1628 - accuracy: 0.9385 - val_loss: 0.3641 - val_accuracy: 0.8868 Epoch 20/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1597 - accuracy: 0.9405 - val_loss: 0.3523 - val_accuracy: 0.8942 Epoch 21/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1534 - accuracy: 0.9434 - val_loss: 0.3584 - val_accuracy: 0.8951 Epoch 22/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1507 - accuracy: 0.9441 - val_loss: 0.3577 - val_accuracy: 0.8923 Epoch 23/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1453 - accuracy: 0.9452 - val_loss: 0.3807 - val_accuracy: 0.8957 Epoch 24/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1392 - accuracy: 0.9476 - val_loss: 0.3711 - val_accuracy: 0.8960 Epoch 25/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1364 - accuracy: 0.9494 - val_loss: 0.3731 - val_accuracy: 0.8940 Epoch 26/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1315 - accuracy: 0.9511 - val_loss: 0.3805 - val_accuracy: 0.8932 Epoch 27/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1319 - accuracy: 0.9507 - val_loss: 0.3966 - val_accuracy: 0.8880 Epoch 28/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1266 - accuracy: 0.9534 - val_loss: 0.3994 - val_accuracy: 0.8920 Epoch 29/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1207 - accuracy: 0.9546 - val_loss: 0.3918 - val_accuracy: 0.8959 Epoch 30/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1174 - accuracy: 0.9567 - val_loss: 0.4043 - val_accuracy: 0.8928 Epoch 31/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1191 - accuracy: 0.9546 - val_loss: 0.4114 - val_accuracy: 0.8951 Epoch 32/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1140 - accuracy: 0.9563 - val_loss: 0.4149 - val_accuracy: 0.8962 Epoch 33/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1121 - accuracy: 0.9574 - val_loss: 0.4373 - val_accuracy: 0.8931 Epoch 34/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1085 - accuracy: 0.9598 - val_loss: 0.4353 - val_accuracy: 0.8939 Epoch 35/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1056 - accuracy: 0.9591 - val_loss: 0.4325 - val_accuracy: 0.8938 Epoch 36/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1066 - accuracy: 0.9600 - val_loss: 0.4700 - val_accuracy: 0.8899 Epoch 37/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1019 - accuracy: 0.9615 - val_loss: 0.4440 - val_accuracy: 0.8947 Epoch 38/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0973 - accuracy: 0.9635 - val_loss: 0.4481 - val_accuracy: 0.8959 Epoch 39/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.1008 - accuracy: 0.9622 - val_loss: 0.4772 - val_accuracy: 0.8954 Epoch 40/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0919 - accuracy: 0.9653 - val_loss: 0.4723 - val_accuracy: 0.8916 Epoch 41/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0921 - accuracy: 0.9653 - val_loss: 0.4867 - val_accuracy: 0.8953 Epoch 42/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0919 - accuracy: 0.9657 - val_loss: 0.4710 - val_accuracy: 0.8936 Epoch 43/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0873 - accuracy: 0.9664 - val_loss: 0.4844 - val_accuracy: 0.8905 Epoch 44/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0884 - accuracy: 0.9669 - val_loss: 0.4972 - val_accuracy: 0.8963 Epoch 45/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0849 - accuracy: 0.9685 - val_loss: 0.4790 - val_accuracy: 0.8969 Epoch 46/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0831 - accuracy: 0.9687 - val_loss: 0.5028 - val_accuracy: 0.8945 Epoch 47/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0793 - accuracy: 0.9698 - val_loss: 0.5031 - val_accuracy: 0.8945 Epoch 48/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0806 - accuracy: 0.9693 - val_loss: 0.5065 - val_accuracy: 0.8990 Epoch 49/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0751 - accuracy: 0.9714 - val_loss: 0.5719 - val_accuracy: 0.8924 Epoch 50/50 1500/1500 [==============================] - 3s 2ms/step - loss: 0.0785 - accuracy: 0.9707 - val_loss: 0.5123 - val_accuracy: 0.8985 <keras.callbacks.History at 0x7fb39810a150>
Untuk menyelesaikan tutorial ini, evaluasi hypermodel pada data uji.
eval_result = hypermodel.evaluate(img_test, label_test)
print("[test loss, test accuracy]:", eval_result)
313/313 [==============================] - 1s 2ms/step - loss: 0.5632 - accuracy: 0.8908 [test loss, test accuracy]: [0.5631944537162781, 0.8907999992370605]
Direktori my_dir/intro_to_kt berisi log terperinci dan pos pemeriksaan untuk setiap percobaan (konfigurasi model) yang dijalankan selama pencarian hyperparameter. Jika Anda menjalankan kembali pencarian hyperparameter, Keras Tuner menggunakan status yang ada dari log ini untuk melanjutkan pencarian. Untuk menonaktifkan perilaku ini, berikan argumen overwrite=True tambahan saat membuat instance tuner.
Ringkasan
Dalam tutorial ini, Anda belajar bagaimana menggunakan Keras Tuner untuk menyetel hyperparameters untuk sebuah model. Untuk mempelajari lebih lanjut tentang Keras Tuner, lihat sumber daya tambahan berikut:
Lihat juga Dasbor HParams di TensorBoard untuk menyesuaikan hyperparameter model Anda secara interaktif.