You will be given a definition of a task first, then some input of the task.
In this task, you will be presented with a context from an academic paper and a question separated with a
. You have to answer the question based on the context.

Following the previous works, we report the precision ($P.$), recall ($R.$) and $F_1$ scores for target recognition and targeted sentiment.
Question: How is the effectiveness of the model evaluated?
Output:
precision ($P.$), recall ($R.$) and $F_1$ scores for target recognition and targeted sentiment