Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Study of BERT for Non-Factoid Question-Answering under Passage Length
  Constraints   We study the use of BERT for non-factoid question-answering, focusing on the
passage re-ranking task under varying passage lengths. To this end, we explore
the fine-tuning of BERT in different learning-to-rank setups, comprising both
point-wise and pair-wise methods, resulting in substantial improvements over
the state-of-the-art. We then analyze the effectiveness of BERT for different
passage lengths and suggest how to cope with large passages.

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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph