ParlAI QA Data Collection Task

[vaibhavad]

Overview

This is an example task of ParlAI QA Data Collection implemented in Mephisto. This is still a draft implementation. Please improvements and functionalities that can be added to this.

TODO

• Improve passage data loader. Currently, I am using ParlAI agents for data loading, with wrappers implemented in data_model.dataloader
• Frontend changes - passage should be in place to the task description, and annotator should be able to highlight stuff in the passage as evidence (a requirement for most QA data collection tasks)