Keras ValueError:没有变量到

Question

我做了一个Keras模型，但是错误：“ValueError:No variables to save”不断出现，我不知道这是什么意思，也不知道是什么导致了这个问题。你知道吗

我试图改变存储Keras模型的方式，但似乎这不是问题所在。。。你知道吗

下面的代码是构建Keras模型之后的部分。你知道吗

tensorboard_callback = TensorBoard(log_dir = log_path, write_graph = True, embeddings_freq = 'batch')
es_min_valLoss = EarlyStopping(monitor = 'val_loss', patience = 15, mode = 'min')

model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
train_history=model.fit(x = trainData, y = trainLabels, validation_split = validation_split, 
                        epochs = epochs, batch_size = batch_size, verbose = 2, 
                        callbacks=[tensorboard_callback, es_min_valLoss])

错误消息如下所示：

Traceback (most recent call last):

  File "<ipython-input-27-9694f30344b3>", line 9, in <module>
    callbacks=[tensorboard_callback, es_min_valLoss])

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\keras\models.py", line 1002, in fit
    validation_steps=validation_steps)

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\keras\engine\training.py", line 1705, in fit
    validation_steps=validation_steps)

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\keras\engine\training.py", line 1155, in _fit_loop
    callbacks.set_model(callback_model)

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\keras\callbacks.py", line 52, in set_model
    callback.set_model(model)

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\keras\callbacks.py", line 802, in set_model
    self.saver = tf.train.Saver(list(embeddings.values()))

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\tensorflow\python\training\saver.py", line 832, in __init__
    self.build()

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\tensorflow\python\training\saver.py", line 844, in build
    self._build(self._filename, build_save=True, build_restore=True)

  File "D:\Anaconda3\envs\tensorflow-gpu\lib\site-packages\tensorflow\python\training\saver.py", line 869, in _build
    raise ValueError("No variables to save")

ValueError: No variables to save

Answer 1

你的嵌入数据是什么？必须将embeddings_data传递给TensorBoard回调。如果不使用嵌入，请删除参数embeddings_freq

Keras文档很棒，您可以阅读更多关于TensorBoard回调here