Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: SpanNER: Named Entity Re-/Recognition as Span Prediction   Recent years have seen the paradigm shift of Named Entity Recognition (NER)
systems from sequence labeling to span prediction. Despite its preliminary
effectiveness, the span prediction model's architectural bias has not been
fully understood. In this paper, we first investigate the strengths and
weaknesses when the span prediction model is used for named entity recognition
compared with the sequence labeling framework and how to further improve it,
which motivates us to make complementary advantages of systems based on
different paradigms. We then reveal that span prediction, simultaneously, can
serve as a system combiner to re-recognize named entities from different
systems' outputs. We experimentally implement 154 systems on 11 datasets,
covering three languages, comprehensive results show the effectiveness of span
prediction models that both serve as base NER systems and system combiners. We
make all code and datasets available: \url{https://github.com/neulab/spanner},
as well as an online system demo: \url{http://spanner.sh}. Our model also has
been deployed into the ExplainaBoard platform, which allows users to flexibly
perform a system combination of top-scoring systems in an interactive way:
\url{http://explainaboard.nlpedia.ai/leaderboard/task-ner/}.

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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
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The categories of this paper are: physics
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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: adap-org
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg