230 research outputs found
Tunneling Effect Near Weakly Isolated Horizon
The tunneling effect near a weakly isolated horizon (WIH) has been studied.
By applying the null geodesic method of Parikh and Wilczek and Hamilton-Jacibi
method of Angheben et al. to a weakly isolated horizon, we recover the
semiclassical emission rate in the tunneling process. We show that the
tunneling effect exists in a wide class of spacetimes admitting weakly isolated
horizons. The general thermodynamic nature of WIH is then confirmed.Comment: 7 pages, accepted for publication in Physical Review
On Newman-Penrose constants of stationary electrovacuum spacetimes
A theorem related to the Newman-Penrose constants is proven. The theorem
states that all the Newman-Penrose constants of asymptotically flat,
stationary, asymptotically algebraically special electrovacuum spacetimes are
zero. Straightforward application of this theorem shows that all the
Newman-Penrose constants of the Kerr-Newman spacetime must vanish.Comment: 11pages, no figures accepted by PR
Unsupervised Explanation Generation via Correct Instantiations
While large pre-trained language models (PLM) have shown their great skills
at solving discriminative tasks, a significant gap remains when compared with
humans for explanation-related tasks. Among them, explaining the reason why a
statement is wrong (e.g., against commonsense) is incredibly challenging. The
major difficulty is finding the conflict point, where the statement contradicts
our real world. This paper proposes Neon, a two-phrase, unsupervised
explanation generation framework. Neon first generates corrected instantiations
of the statement (phase I), then uses them to prompt large PLMs to find the
conflict point and complete the explanation (phase II). We conduct extensive
experiments on two standard explanation benchmarks, i.e., ComVE and e-SNLI.
According to both automatic and human evaluations, Neon outperforms baselines,
even for those with human-annotated instantiations. In addition to explaining a
negative prediction, we further demonstrate that Neon remains effective when
generalizing to different scenarios.Comment: Accepted to AAAI-2
DDT: Dual-branch Deformable Transformer for Image Denoising
Transformer is beneficial for image denoising tasks since it can model
long-range dependencies to overcome the limitations presented by inductive
convolutional biases. However, directly applying the transformer structure to
remove noise is challenging because its complexity grows quadratically with the
spatial resolution. In this paper, we propose an efficient Dual-branch
Deformable Transformer (DDT) denoising network which captures both local and
global interactions in parallel. We divide features with a fixed patch size and
a fixed number of patches in local and global branches, respectively. In
addition, we apply deformable attention operation in both branches, which helps
the network focus on more important regions and further reduces computational
complexity. We conduct extensive experiments on real-world and synthetic
denoising tasks, and the proposed DDT achieves state-of-the-art performance
with significantly fewer computational costs.Comment: The code is avaliable at: https://github.com/Merenguelkl/DD
Shadow: Exploiting the Power of Choice for Efficient Shuffling in MapReduce
International audienc
Deep Learning-Based Human Pose Estimation: A Survey
Human pose estimation aims to locate the human body parts and build human
body representation (e.g., body skeleton) from input data such as images and
videos. It has drawn increasing attention during the past decade and has been
utilized in a wide range of applications including human-computer interaction,
motion analysis, augmented reality, and virtual reality. Although the recently
developed deep learning-based solutions have achieved high performance in human
pose estimation, there still remain challenges due to insufficient training
data, depth ambiguities, and occlusion. The goal of this survey paper is to
provide a comprehensive review of recent deep learning-based solutions for both
2D and 3D pose estimation via a systematic analysis and comparison of these
solutions based on their input data and inference procedures. More than 240
research papers since 2014 are covered in this survey. Furthermore, 2D and 3D
human pose estimation datasets and evaluation metrics are included.
Quantitative performance comparisons of the reviewed methods on popular
datasets are summarized and discussed. Finally, the challenges involved,
applications, and future research directions are concluded. We also provide a
regularly updated project page: \url{https://github.com/zczcwh/DL-HPE
- …