Keras上的model.compile和model.fit_generator出错

Question

Beginner with Keras -- I'm attempting to train a very simple neural network on a series of images from my local folder, but getting an error when I try to use fit_generator .

From

model.fit_generator(train_batches,steps_per_epoch=33, validation_data=valid_batches,validation_steps=50,epochs=10,verbose=2)`

I get the error

RuntimeError: You must compile your model before using it.

despite the fact that I compile the model in the line immediately about it with

model.compile(Adam(0.01),loss="categorical_crossentropy",metrics=["accuracy"])

which runs without errors. (see pictures).

Image of error , Image of generator ,

Answer 1

This can be a rare case where pictures are more useful than code sample.

The image says, the compile cell got number [206] , and fit cell is [210] . In between them, you have recreated the model at [209] , which deletes the previously compiled model and creates a new one.

I think it will run (unless there is another bug) if you execute the cells from top to bottom again.

Answer 2

I ran into the same issue. There is a bug: https://github.com/tensorflow/tensorflow/issues/18287

Unfortunately the fix is not yet released.