6,883 research outputs found
Aggregated Text Transformer for Scene Text Detection
This paper explores the multi-scale aggregation strategy for scene text
detection in natural images. We present the Aggregated Text TRansformer(ATTR),
which is designed to represent texts in scene images with a multi-scale
self-attention mechanism. Starting from the image pyramid with multiple
resolutions, the features are first extracted at different scales with shared
weight and then fed into an encoder-decoder architecture of Transformer. The
multi-scale image representations are robust and contain rich information on
text contents of various sizes. The text Transformer aggregates these features
to learn the interaction across different scales and improve text
representation. The proposed method detects scene texts by representing each
text instance as an individual binary mask, which is tolerant of curve texts
and regions with dense instances. Extensive experiments on public scene text
detection datasets demonstrate the effectiveness of the proposed framework
(Z)-Ethyl 2,4-diphenyl-3-(propylamino)but-2-enoate
The title compound, C21H25NO2, adopts a Z conformation about the C=C double bond. The molecular structure is stabilized by an intramolecular N—H⋯O hydrogen bond and the dihedral angle between the aromatic ring planes is 76.04 (12)°. The atoms of the ethyl substituent are disordered over two sets of sites in a 0.60 (2):0.40 (2) ratio
Ternary Compression for Communication-Efficient Federated Learning
Learning over massive data stored in different locations is essential in many
real-world applications. However, sharing data is full of challenges due to the
increasing demands of privacy and security with the growing use of smart mobile
devices and IoT devices. Federated learning provides a potential solution to
privacy-preserving and secure machine learning, by means of jointly training a
global model without uploading data distributed on multiple devices to a
central server. However, most existing work on federated learning adopts
machine learning models with full-precision weights, and almost all these
models contain a large number of redundant parameters that do not need to be
transmitted to the server, consuming an excessive amount of communication
costs. To address this issue, we propose a federated trained ternary
quantization (FTTQ) algorithm, which optimizes the quantized networks on the
clients through a self-learning quantization factor. A convergence proof of the
quantization factor and the unbiasedness of FTTQ is given. In addition, we
propose a ternary federated averaging protocol (T-FedAvg) to reduce the
upstream and downstream communication of federated learning systems. Empirical
experiments are conducted to train widely used deep learning models on publicly
available datasets, and our results demonstrate the effectiveness of FTTQ and
T-FedAvg compared with the canonical federated learning algorithms in reducing
communication costs and maintaining the learning performance
Progressive Scene Text Erasing with Self-Supervision
Scene text erasing seeks to erase text contents from scene images and current
state-of-the-art text erasing models are trained on large-scale synthetic data.
Although data synthetic engines can provide vast amounts of annotated training
samples, there are differences between synthetic and real-world data. In this
paper, we employ self-supervision for feature representation on unlabeled
real-world scene text images. A novel pretext task is designed to keep
consistent among text stroke masks of image variants. We design the Progressive
Erasing Network in order to remove residual texts. The scene text is erased
progressively by leveraging the intermediate generated results which provide
the foundation for subsequent higher quality results. Experiments show that our
method significantly improves the generalization of the text erasing task and
achieves state-of-the-art performance on public benchmarks
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
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. IV. H Time Lags and Implications for Super-Eddington Accretion
We have completed two years of photometric and spectroscopic monitoring of a
large number of active galactic nuclei (AGNs) with very high accretion rates.
In this paper, we report on the result of the second phase of the campaign,
during 2013--2014, and the measurements of five new H time lags out of
eight monitored AGNs. All five objects were identified as super-Eddington
accreting massive black holes (SEAMBHs). The highest measured accretion rates
for the objects in this campaign are , where
,
is the mass accretion rates, is the Eddington luminosity and
is the speed of light. We find that the H time lags in SEAMBHs are
significantly shorter than those measured in sub-Eddington AGNs, and the
deviations increase with increasing accretion rates. Thus, the relationship
between broad-line region size () and optical luminosity at
5100\AA, , requires accretion rate as an additional
parameter. We propose that much of the effect may be due to the strong
anisotropy of the emitted slim-disk radiation. Scaling by
the gravitational radius of the black hole, we define a new radius-mass
parameter () and show that it saturates at a critical accretion rate of
, indicating a transition from thin to slim
accretion disk and a saturated luminosity of the slim disks. The parameter
is a very useful probe for understanding the various types of accretion onto
massive black holes. We briefly comment on implications to the general
population of super-Eddington AGNs in the universe and applications to
cosmology.Comment: 53 pages, 12 figures, 7 tables, accepted for publication in The
Astrophysical Journa
Anti-inflammatory and anti-oxidative effects of corilagin in a rat model of acute cholestasis
BACKGROUND: Nowadays, treatments for cholestasis remain largely nonspecific and often ineffective. Recent studies showed that inflammatory injuries and oxidative stress occur in the liver with cholestasis. In this study, we would use corilagin to treat the animal model of acute cholestasis in order to define the activity to interfere with inflammation-related and oxidative stress pathway in cholestatic pathogenesis. METHODS: Rats were administrated with alpha-naphthylisothiocyanate to establish model of cholestasis and divided into corilagin, ursodeoxycholic acid, dexamethasone, model and normal groups with treatment of related agent. At 24h, 48h and 72h time points after administration, living condition, serum markers of liver damage, pathological changes of hepatic tissue, nuclear factor (NF)-kappaB, myeloperoxidase (MPO), malondialdehyde (MDA), superoxide dismutase (SOD) and nitric oxide (NO) were examined and observed. RESULTS: Compared to model group, corilagin had remarkable effect on living condition, pathological manifestation of liver tissue, total bilirubin, direct bilirubin, (P<0.01), but no effect on alanine aminotransferase (ALT) and aspartate aminotransferase (AST). With corilagin intervention, levels of MPO, MDA and translocation of NF-κB were notably decreased, and levels of SOD and NO were markedly increased (P<0.05 or P<0.01). CONCLUSIONS: It is shown that corilagin is a potential component to relieve cholestasis through inflammation-related and oxidation-related pathway
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