Task: Question Answering
Input (English): This metric is used to evaluate the accuracy of dialogue belief tracker BIBREF1.

APRA: Action Per-Response Accuracy (APRA) evaluates the per-turn accuracy of the dialogue actions generated by dialogue policy maker. For baselines, APRA evaluates the classification accuracy of the dialogue policy maker. But our model actually generates each individual token of actions, and we consider a prediction to be correct only if every token of the model output matches the corresponding token in the ground truth.

BLEU BIBREF19: The metric evaluates the quality of the final response generated by natural language generator. The metric is usually used to measure the performance of the task-oriented dialogue system. 
 Question: What metrics are used to measure performance of models?
Output (English): BPRA APRA BLEU