Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thinking Globally, Acting Locally: Distantly Supervised Global-to-Local
  Knowledge Selection for Background Based Conversation   Background Based Conversations (BBCs) have been introduced to help
conversational systems avoid generating overly generic responses. In a BBC, the
conversation is grounded in a knowledge source. A key challenge in BBCs is
Knowledge Selection (KS): given a conversational context, try to find the
appropriate background knowledge (a text fragment containing related facts or
comments, etc.) based on which to generate the next response. Previous work
addresses KS by employing attention and/or pointer mechanisms. These mechanisms
use a local perspective, i.e., they select a token at a time based solely on
the current decoding state. We argue for the adoption of a global perspective,
i.e., pre-selecting some text fragments from the background knowledge that
could help determine the topic of the next response. We enhance KS in BBCs by
introducing a Global-to-Local Knowledge Selection (GLKS) mechanism. Given a
conversational context and background knowledge, we first learn a topic
transition vector to encode the most likely text fragments to be used in the
next response, which is then used to guide the local KS at each decoding
timestamp. In order to effectively learn the topic transition vector, we
propose a distantly supervised learning schema. Experimental results show that
the GLKS model significantly outperforms state-of-the-art methods in terms of
both automatic and human evaluation. More importantly, GLKS achieves this
without requiring any extra annotations, which demonstrates its high degree of
scalability.

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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: nucl-ex