Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Course Concept Expansion in MOOCs with External Knowledge and
  Interactive Game   As Massive Open Online Courses (MOOCs) become increasingly popular, it is
promising to automatically provide extracurricular knowledge for MOOC users.
Suffering from semantic drifts and lack of knowledge guidance, existing methods
can not effectively expand course concepts in complex MOOC environments. In
this paper, we first build a novel boundary during searching for new concepts
via external knowledge base and then utilize heterogeneous features to verify
the high-quality results. In addition, to involve human efforts in our model,
we design an interactive optimization mechanism based on a game. Our
experiments on the four datasets from Coursera and XuetangX show that the
proposed method achieves significant improvements(+0.19 by MAP) over existing
methods. The source code and datasets have been published.

18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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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: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom