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.

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Answer 1

This error also happens when you specify the validation_data=(X_test, Y_test) and your X_test and/or Y_test are empty. To check this, print the shape of X_test and Y_test respectively. In this case, the model.fit(validation_data=(X_test, Y_test), ...) method ran but because the validation set was empty, it didn't create a dictionary key for val_loss in the history.history dictionary.