Tensorflow2的回調機制(callback)

# Tensorboard, earlystopping, ModelCheckpointlogdir = './dnn-callbacks'if not os.path.exists(logdir):    os.mkdir(logdir)output_model_file = os.path.join(logdir,                                 "fashion_mnist_model.h5")callbacks = [    keras.callbacks.TensorBoard(logdir),    keras.callbacks.ModelCheckpoint(output_model_file,                                    save_best_only = True),    keras.callbacks.EarlyStopping(patience=5, min_delta=1e-3),]history = model.fit(x_train_scaled, y_train, epochs=10,                    validation_data=(x_valid_scaled, y_valid),                    callbacks = callbacks)