“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

In my case it was because I missed the parentheses. I am using tensorflow_addons so my code was like

model.compile(optimizer=tfa.optimizers.LAMB, loss='binary_crossentropy',
              metrics=['binary_accuracy'])

And it gives

ValueError: ('Could not interpret optimizer identifier:', )

Then I changed my code into:

model.compile(optimizer=tfa.optimizers.LAMB(), loss='binary_crossentropy',
              metrics=['binary_accuracy'])

and it works.