Question

我正在使用Tensorflow 1.14和Python 3.5。我收到以下错误：

UnboundLocalError: local variable 'batch_index' referenced before assignment

完整的追溯信息是：

---------------------------------------------------------------------------
UnboundLocalError                         Traceback (most recent call last)
<timed exec> in <module>

/usr/local/lib/python3.5/dist-packages/keras/engine/training.py in fit(self, x, y, batch_size, epochs, verbose, callbacks, validation_split, validation_data, shuffle, class_weight, sample_weight, initial_epoch, steps_per_epoch, validation_steps, validation_freq, max_queue_size, workers, use_multiprocessing, **kwargs)
   1237                                         steps_per_epoch=steps_per_epoch,
   1238                                         validation_steps=validation_steps,
-> 1239                                         validation_freq=validation_freq)
   1240 
   1241     def evaluate(self,

/usr/local/lib/python3.5/dist-packages/keras/engine/training_arrays.py in fit_loop(model, fit_function, fit_inputs, out_labels, batch_size, epochs, verbose, callbacks, val_function, val_inputs, shuffle, initial_epoch, steps_per_epoch, validation_steps, validation_freq)
    203                     break
    204 
--> 205             if batch_index == len(batches) - 1:  # Last batch.
    206                 if do_validation and should_run_validation(validation_freq, epoch):
    207                     val_outs = test_loop(model, val_function, val_inputs,

UnboundLocalError: local variable 'batch_index' referenced before assignment

在尝试了来自不同SO答案的多个建议后，我设法通过从以下导入语句切换来解决了该问题：

from keras.layers import LSTM, Dense
from keras.models import Sequential

对于这些导入语句：

from tensorflow.python.keras.layers import LSTM, Dense
from tensorflow.python.keras.models import Sequential

这确实解决了我的问题，但令我感到困惑的是：两者有何不同？

tf.keras和keras是否使用不同的方法和类？

Answer 1

tf.keras与keras之间的区别。

Keras：是用于训练神经网络的高级神经网络API。它独立于tensorflow，并且可以在多个后端（例如tensorflow, Theano and CNTK）上运行。文档here
tf.keras：：tf.keras是tensorflow中keras API的特定高级实现，并增加了对某些tensorflow功能的支持。

“ from keras.models import Sequential”和“ from tensorflow.python.keras.models import Sequential”有什么区别？

1 个答案: