What characterizes the 303 domains? e.g. is this different subject tags?
The domains represent different subfields related to the topic of the questions.  
We present a large-scale dataset for the task of rewriting an ill-formed natural language question to a well-formed one. Our multi-domain question rewriting MQR dataset is constructed from human contributed Stack Exchange question edit histories. The dataset contains 427,719 question pairs which come from 303 domains. We provide human annotations for a subset of the dataset as a quality estimate. When moving from ill-formed to well-formed questions, the question quality improves by an average of 45 points across three aspects. We train sequence-to-sequence neural models on the constructed dataset and obtain an improvement of 13.2% in BLEU-4 over baseline methods built from other data resources. We release the MQR dataset to encourage research on the problem of question rewriting.
Understanding text and voice questions from users is a difficult task as it involves dealing with “word salad” and ill-formed text. Ill-formed questions may arise from imperfect speech recognition systems, search engines, dialogue histories, inputs from low bandwidth devices such as mobile phones, or second language learners, among other sources. However, most downstream applications involving questions, such as question answering and semantic parsing, are trained on well-formed natural language. In this work, we focus on rewriting textual ill-formed questions, which could improve the performance of such downstream applications. BIBREF0 introduced the task of identifying well-formed natural language questions. In this paper, we take a step further to investigate methods to rewrite ill-formed questions into well-formed ones without changing their semantics. We create a multi-domain question rewriting dataset (MQR) from human contributed Stack Exchange question edit histories. This dataset provides pairs of questions: the original ill-formed question and a well-formed question rewritten by the author or community contributors. The dataset contains 427,719 question pairs which come from 303 domains. The MQR dataset is further split into TRAIN and DEV/TEST, where question pairs in DEV/TEST have less $n$-gram overlap but better semantic preservation after rewriting. Table TABREF2 shows some example question pairs from the MQR DEV split. Our dataset enables us to train models directly for the task of question rewriting. We train neural generation models on our dataset, including Long-Short Term Memory networks (LSTM; BIBREF1) with attention BIBREF2 and transformers BIBREF3. We show that these models consistently improve the well-formedness of questions although sometimes at the expense of semantic drift. We compare to approaches that do not use our training dataset, including general-purpose sentence paraphrasing, grammatical error correction (GEC) systems, and round trip neural machine translation. Methods trained on our dataset greatly outperform those developed from other resources. Augmenting our training set with additional question pairs such as Quora or Paralex question pairs BIBREF4 has mixed impact on this task. Our findings from the benchmarked methods suggest potential research directions to improve question quality. To summarize our contributions: We propose the task of question rewriting: converting textual ill-formed questions to well-formed ones while preserving their semantics. We construct a large-scale multi-domain question rewriting dataset MQR from human generated Stack Exchange question edit histories. The development and test sets are of high quality according to human annotation. The training set is of large-scale. We release the MQR dataset to encourage research on the question rewriting task. We benchmark a variety of neural models trained on the MQR dataset, neural models trained with other question rewriting datasets, and other paraphrasing techniques. We find that models trained on the MQR and Quora datasets combined followed by grammatical error correction perform the best in the MQR question rewriting task.