instruction:
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.
question:
In this work, we use pretraining on the unlabeled data of each task and show that it can increase the performance of classification systems. 
 Question: Where is MVCNN pertained?
answer:
on the unlabeled data of each task


question:
 Each passage was labelled by 3 unique annotators. 
 Question: How many annotators were there?
answer:
3 


question:
 The annotation scheme was developed to capture three aspects of classroom talk that are theorized in the literature as important to discussion quality and learning opportunities: argumentation (the process of systematically reasoning in support of an idea), specificity (the quality of belonging or relating uniquely to a particular subject), and knowledge domain (area of expertise represented in the content of the talk). 
 Question: how do they measure discussion quality?
answer:

Measuring three aspects: argumentation, specificity and knowledge domain.