“Could not interpret optimizer identifier” error in Keras

Question

I got this error when I tried to modify the learning rate parameter of SGD optimizer in Keras. Did I miss something in my codes or my Keras was not installed properly?

Answer 1

Running the Keras documentaion example https://keras.io/examples/cifar10_cnn/ and installing the latest keras and tensor flow versions

(at the time of this writing tensorflow 2.0.0a0 and Keras version 2.2.4 )

I had to import explicitly the optimizer the keras the example is using,specifically the line on top of the example :

opt = tensorflow.keras.optimizers.rmsprop(lr=0.0001, decay=1e-6)

was replaced by

from tensorflow.keras.optimizers import RMSprop

opt = RMSprop(lr=0.0001, decay=1e-6)

In the recent version the api "broke" and keras.stuff in a lot of cases became tensorflow.keras.stuff.