93 research outputs found
Voucher Abuse Detection with Prompt-based Fine-tuning on Graph Neural Networks
Voucher abuse detection is an important anomaly detection problem in
E-commerce. While many GNN-based solutions have emerged, the supervised
paradigm depends on a large quantity of labeled data. A popular alternative is
to adopt self-supervised pre-training using label-free data, and further
fine-tune on a downstream task with limited labels. Nevertheless, the
"pre-train, fine-tune" paradigm is often plagued by the objective gap between
pre-training and downstream tasks. Hence, we propose VPGNN, a prompt-based
fine-tuning framework on GNNs for voucher abuse detection. We design a novel
graph prompting function to reformulate the downstream task into a similar
template as the pretext task in pre-training, thereby narrowing the objective
gap. Extensive experiments on both proprietary and public datasets demonstrate
the strength of VPGNN in both few-shot and semi-supervised scenarios. Moreover,
an online deployment of VPGNN in a production environment shows a 23.4%
improvement over two existing deployed models.Comment: 7 pages, Accepted by CIKM23 Applied Research Trac
Extremely Strong ^{13}CO J=3-2 Line in the "Water Fountain" IRAS 16342-3814: Evidence for the Hot-Bottom Burning
We observed four "water fountain" sources in the CO J=3-2 line emission with
the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope in
2010-2011. The water fountain sources are evolved stars that form high-velocity
collimated jets traced by water maser emission. The CO line was detected only
from IRAS 16342-3814. The present work confirmed that the ^{12}CO to ^{13}CO
line intensity ratio is ~1.5 at the systemic velocity. We discuss the origins
of the very low ^{12}CO to ^{13}CO intensity ratio, as possible evidence for
the "hot-bottom burning" in an oxygen-rich star, and the CO intensity variation
in IRAS 16342-3814.Comment: 10 pages, 3 figures, accepted for publication to the Publications of
the Astronomical Society of Japan, Vol. 64, No.
Phosphorous Diffuser Diverged Blue Laser Diode for Indoor Lighting and Communication.
An advanced light-fidelity (Li-Fi) system based on the blue Gallium nitride (GaN) laser diode (LD) with a compact white-light phosphorous diffuser is demonstrated for fusing the indoor white-lighting and visible light communication (VLC). The phosphorous diffuser adhered blue GaN LD broadens luminescent spectrum and diverges beam spot to provide ample functionality including the completeness of Li-Fi feature and the quality of white-lighting. The phosphorous diffuser diverged white-light spot covers a radiant angle up to 120(o) with CIE coordinates of (0.34, 0.37). On the other hand, the degradation on throughput frequency response of the blue LD is mainly attributed to the self-feedback caused by the reflection from the phosphor-air interface. It represents the current state-of-the-art performance on carrying 5.2-Gbit/s orthogonal frequency-division multiplexed 16-quadrature-amplitude modulation (16-QAM OFDM) data with a bit error rate (BER) of 3.1 × 10(-3) over a 60-cm free-space link. This work aims to explore the plausibility of the phosphorous diffuser diverged blue GaN LD for future hybrid white-lighting and VLC systems
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Ministry of Education, Singapore under its Academic Research Funding Tier
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