Task: Question Answering
Input (English): The final results for our F1-score from this classification technique are 0.52 and 0.31 for the single and multi-turn data respectively.

We compare our results for both the single-turn and multi-turn experiments to the accuracies on the test data based off the BLEU score. 
 Question: which existing metrics do they compare with?
Output (English): F1-score BLEU score