Racca, David and Jones, Gareth J.F.ORCID: 0000-0003-2923-8365
(2016)
DCU at the NTCIR-12 SpokenQuery&Doc-2 task.
In: 12th NTCIR Conference on Evaluation of Information Access Technologies, 7-10 June 2016, Tokyo, Japan.
ISBN 978-4-86049-071-3
We describe DCU’s participation in the NTCIR-12 SpokenQuery&Doc (SQD-2) task. In the context of the slide-group
retrieval sub-task, we experiment with a passage retrieval
method that re-scores each passage according to the relevance score of the document from which the passage is taken.
This is performed by linearly interpolating their relevance
scores which are calculated using the Okapi BM25 model of
probabilistic retrieval for passages and documents independently. In conjunction with this, we assess the benefits of
using pseudo-relevance feedback for expanding the textual
representation of the spoken queries with terms found in the
top-ranked documents and passages, and experiment with
a general multidimensional optimisation method to jointly
tune the BM25 and query expansion parameters with queries
and relevance data from the NTCIR-11 SQD-1 task. Retrieval experiments performed over the SQD-1 and SQD-2
queries confirm previous findings which affirm that integrating document information when ranking passages can lead
to improved passage retrieval effectiveness. Furthermore,
results indicate that no significant gains in retrieval effectiveness can be obtained by using query expansion in combination with our retrieval models over these two query sets.
Kando, Noriko and Kishida, Kazuaki and Kato, Makoto P. and Yamamoto, Shuhei, (eds.)
Proceedings of the 12th NTCIR Conference on Evaluation of Information Access Technologies.
.
National Institute of Informatics. ISBN 978-4-86049-071-3