Plotting learning curve in keras gives KeyError: 'val_acc'

Question

I was trying to plot train and test learning curve in keras, however, the following code produces KeyError: \'val_acc error.

The official document

Answer 1

You may need to enable the validation split of your trainset. Usually, the validation happens in 1/3 of the trainset. In your code, make the change as given below:

history=model.fit(X[train], dummy_y[train],validation_split=0.33,nb_epoch=200, batch_size=5, verbose=0) 

It works!