Question

我正在使用ModelCheckpoint在每个时期每500个批次保存检查点。 https://www.tensorflow.org/api_docs/python/tf/keras/callbacks/ModelCheckpoint在此处记录。

我如何设置filepath以包括批次号？我知道我可以在{epoch}中使用logs和参数。

Answer 1

假设您使用的是带有 tf.keras.callbacks.ModelCheckpoint 的 save_freq = int（需要在一定数量的批次后保存），您可以创建一个继承自 ModelCheckpoint 的类并修改该类方法on_train_batch_end

class CustomCallback(tf.keras.callbacks.ModelCheckpoint):
    def __init__(self, filepath, save_freq):
        self.model_name = filepath
        self.save_freq = save_freq
        super().__init__(self.model_name, save_freq=self.save_freq)
            
    def on_train_batch_end(self, batch, logs=None):
        if self._should_save_on_batch(batch):
            filename = self.model_name + "epoch_" + str(self._current_epoch+1) + "_batch_ " + str(batch+1) + '.tf'
            self.model.save_weights(filename)
            print("\nsaved checkpoint: " + filename + "\n")

然后在model.fit中添加这个类的一个实例。

SAVE_FREQ = 200 # number of batches 
custom_callback = CustomCallback(filepath="checkpoint_", save_freq=SAVE_FREQ)
model.fit(..., callbacks=[custom_callback])

这会将纪元和批次编号添加到检查点文件名中。

Epoch 1/3
199/422 [=============>................] - ETA: 6s - loss: 0.0261 - accuracy: 0.9915
saved checkpoint: checkpoint_epoch_0_batch_200.tf

399/422 [===========================>..] - ETA: 0s - loss: 0.0263 - accuracy: 0.9914
saved checkpoint: checkpoint_epoch_0_batch_400.tf

422/422 [==============================] - 13s 31ms/step - loss: 0.0264 - accuracy: 0.9914 - val_loss: 0.0311 - val_accuracy: 0.9920
Epoch 2/3
177/422 [===========>..................] - ETA: 7s - loss: 0.0254 - accuracy: 0.9913
saved checkpoint: checkpoint_epoch_1_batch_178.tf

377/422 [=========================>....] - ETA: 1s - loss: 0.0252 - accuracy: 0.9912
saved checkpoint: checkpoint_epoch_1_batch_378.tf

422/422 [==============================] - 13s 32ms/step - loss: 0.0252 - accuracy: 0.9912 - val_loss: 0.0306 - val_accuracy: 0.9925
Epoch 3/3
156/422 [==========>...................] - ETA: 7s - loss: 0.0253 - accuracy: 0.9914
saved checkpoint: checkpoint_epoch_2_batch_156.tf

355/422 [========================>.....] - ETA: 2s - loss: 0.0246 - accuracy: 0.9919
saved checkpoint: checkpoint_epoch_2_batch_356.tf

422/422 [==============================] - 13s 31ms/step - loss: 0.0245 - accuracy: 0.9919 - val_loss: 0.0294 - val_accuracy: 0.9922

Answer 2

这可能会有所帮助，但问题尚不清楚。在回调类下，有许多功能可以满足您的需求。

示例代码

class WeightsSaver(Callback):
  def __init__(self, N):
    self.N = N
    self.epoch = 0

  def on_epoch_end(self, epoch, logs={}):
    if self.epoch % self.N == 0:
        name = ('weights%04d.hdf5') % self.epoch
        self.model.save_weights(name)
    self.epoch += 1

callbacks_list = [WeightsSaver(10)] #save every 10 models
model.fit(train_X,train_Y,epochs=n_epochs,callbacks=callbacks_list)

TF Keras ModelCheckpoint文件路径批号

2 个答案: