2,489 research outputs found
Retrospective Reader for Machine Reading Comprehension
Machine reading comprehension (MRC) is an AI challenge that requires machine
to determine the correct answers to questions based on a given passage. MRC
systems must not only answer question when necessary but also distinguish when
no answer is available according to the given passage and then tactfully
abstain from answering. When unanswerable questions are involved in the MRC
task, an essential verification module called verifier is especially required
in addition to the encoder, though the latest practice on MRC modeling still
most benefits from adopting well pre-trained language models as the encoder
block by only focusing on the "reading". This paper devotes itself to exploring
better verifier design for the MRC task with unanswerable questions. Inspired
by how humans solve reading comprehension questions, we proposed a
retrospective reader (Retro-Reader) that integrates two stages of reading and
verification strategies: 1) sketchy reading that briefly investigates the
overall interactions of passage and question, and yield an initial judgment; 2)
intensive reading that verifies the answer and gives the final prediction. The
proposed reader is evaluated on two benchmark MRC challenge datasets SQuAD2.0
and NewsQA, achieving new state-of-the-art results. Significance tests show
that our model is significantly better than the strong ELECTRA and ALBERT
baselines. A series of analysis is also conducted to interpret the
effectiveness of the proposed reader.Comment: Accepted by AAAI 202
Explanation of the ATLAS Z-peaked excess by squark pair production in the NMSSM
The ATLAS collaboration recently reported a excess in the
leptonic- channel. We intend to interpret this excess by
squark pair production in the Next-to-Minimal Supersymmetric Standard Model
(NMSSM). The decay chain we employ is , where and denote the
lightest and the next-to-lightest neutralinos with singlino and bino as their
dominant components respectively. Our simulations indicate that after
considering the constraints from the ATLAS searches for
signal the central value of the excess can be obtained for , and if the constraint from the CMS on- search is
further considered, more than 10 signal events are still attainable for
. Compared with the interpretation by
gluino pair production, the squark explanation allows for a significantly wider
range of as well as a less compressed SUSY mass spectrum. We
also show that the squark explanation will be readily tested at the initial
stage of the 14 TeV LHC.Comment: 19 pages, 4 figure
Explanation of the ATLAS Z-peaked excess in the NMSSM
Recently the ATLAS collaboration reported a excess in the
leptonic- channel. This may be interpreted in the
Next-to-Minimal Supersymmetric Standard Model (NMSSM) by gluino pair production
with the decay chain , where and denote the
lightest and the next-to-lightest neutralinos with singlino and bino as their
dominant components respectively. After exploring the relevant parameter space
of the NMSSM by considering the constraints from the ATLAS searches for signals, we conclude that the NMSSM is able to explain the excess
at level with the number of the signal events reaching its measured
central value in optimal cases, and the best explanation comes from a
compressed spectrum such as ,
and . We also check the consistency of the ATLAS results with the
null result of the CMS on- search. We find that under the CMS limits at
C.L., the event number of the ATLAS on- signal can still reach 11 in
our scenario, which is about away from the measured central value.Comment: 18 pages, 2 figure
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