It counts all examples equally and is easy to interpret when classes are balanced and error costs are similar. On imbalanced data, a high score can conceal poor performance on a rare but important class.
Accuracy is the fraction of evaluated predictions that exactly match the correct class or decision.
It counts all examples equally and is easy to interpret when classes are balanced and error costs are similar. On imbalanced data, a high score can conceal poor performance on a rare but important class.