Challenge: In-domain datasets are used to train and validate our model, and other out-of-domain data are used for validation.
Approach: They propose a model which uses cross-task learning with expert representation for the generalization of reading and understanding.
Outcome: The proposed model achieved an average F1 score of 66.1 % in the out-of-domain setting, which is a 4.3 percentage point improvement over the official BERT baseline model.

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Challenge: Pre-trained transformer models are capable of multitasking on diverse NLP tasks, but little is known about how multitaskability and cross-task generalization is achieved.
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Challenge: MRQA datasets have been used to benchmark progress in general-purpose language understanding.
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Challenge: Existing work on machine reading comprehension task is focused on English, but there are few efforts on other languages due to the lack of large-scale training data.
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Challenge: MRC is a popular task in NLP, aiming to understand a passage and answer the relevant questions.
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Challenge: a recent study has shown that language mismatch and domain mismatch can affect performance of a machine reading task . a factor between language mismatched and domain-mismatched has the strongest influence on performance .
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Comprehensive Multi-Dataset Evaluation of Reading Comprehension (D19-58)

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Challenge: Recent research aims to facilitate training and evaluation on several reading comprehension datasets at the same time.
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Challenge: Pretrained language models such as ELMO and XLNet have achieved state-of-the-art performance on various NLP tasks.
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