Task: Question Answering
Input (English): The retrieved pairs are compared to the gold standard and evaluated using precision at $k$ (P@$k$, evaluating how often the correct translation is within the $k$ retrieved nearest neighbours of the query). Throughout this work we report P@1, which is equivalent to accuracy, but we also provide results with P@5 and P@10 in the Appendix. 
 Question: What evaluation metrics did they use?
Output (English): we report P@1, which is equivalent to accuracy we also provide results with P@5 and P@10 in the Appendix