10,487 research outputs found
ELEGANT: Exchanging Latent Encodings with GAN for Transferring Multiple Face Attributes
Recent studies on face attribute transfer have achieved great success. A lot
of models are able to transfer face attributes with an input image. However,
they suffer from three limitations: (1) incapability of generating image by
exemplars; (2) being unable to transfer multiple face attributes
simultaneously; (3) low quality of generated images, such as low-resolution or
artifacts. To address these limitations, we propose a novel model which
receives two images of opposite attributes as inputs. Our model can transfer
exactly the same type of attributes from one image to another by exchanging
certain part of their encodings. All the attributes are encoded in a
disentangled manner in the latent space, which enables us to manipulate several
attributes simultaneously. Besides, our model learns the residual images so as
to facilitate training on higher resolution images. With the help of
multi-scale discriminators for adversarial training, it can even generate
high-quality images with finer details and less artifacts. We demonstrate the
effectiveness of our model on overcoming the above three limitations by
comparing with other methods on the CelebA face database. A pytorch
implementation is available at https://github.com/Prinsphield/ELEGANT.Comment: Github: https://github.com/Prinsphield/ELEGAN
DNA-GAN: Learning Disentangled Representations from Multi-Attribute Images
Disentangling factors of variation has become a very challenging problem on
representation learning. Existing algorithms suffer from many limitations, such
as unpredictable disentangling factors, poor quality of generated images from
encodings, lack of identity information, etc. In this paper, we propose a
supervised learning model called DNA-GAN which tries to disentangle different
factors or attributes of images. The latent representations of images are
DNA-like, in which each individual piece (of the encoding) represents an
independent factor of the variation. By annihilating the recessive piece and
swapping a certain piece of one latent representation with that of the other
one, we obtain two different representations which could be decoded into two
kinds of images with the existence of the corresponding attribute being
changed. In order to obtain realistic images and also disentangled
representations, we further introduce the discriminator for adversarial
training. Experiments on Multi-PIE and CelebA datasets finally demonstrate that
our proposed method is effective for factors disentangling and even overcome
certain limitations of the existing methods.Comment: ICLR 2018 workshop, github: https://github.com/Prinsphield/DNA-GA
Development of front-end readout electronics for silicon strip detectors
A front-end readout electronics system has been developed for silicon strip
detectors. The system uses an application specific integrated circuit (ASIC)
ATHED to realize multi-channel E&T measurement. The slow control of ASIC chips
is achieved by parallel port and the timing control signals of ASIC chips are
provided by the CPLD. The data acquisition is implemented with a PXI-DAQ card.
The system software has a user-friendly GUI which uses LabWindows/CVI in
Windows XP operating system. Test results showed that the energy resolution is
about 1.22 % for alphas at 5.48 MeV and the maximum channel crosstalk of system
is 4.6%. The performance of the system is very reliable and suitable for
nuclear physics experiments.Comment: This article has been submitted to Chinese Physics
Primordial non-Gaussianity in noncanonical warm inflation: three- and four-point correlations
Non-Gaussianity generated in inflation can be contributed by two parts. The
first part, denoted by , is the contribution from four-point
correlation of inflaton field which can be calculated using
formalism, and the second part, denoted by , is the contribution
from the three-point correlation function of the inflaton field. We consider
the two contributions to the non-Gaussianity in noncanonical warm inflation
throughout (noncanonical warm inflation is a new inflationary model which is
proposed in \cite{Zhang2014}). We find the two contributions are complementary
to each other. The four-point correlation contribution to the non-Gaussianity
is overwhelmed by the three-point one in strong noncanonical limit, while the
conclusion is opposite in the canonical case. We also discuss the influence of
the field redefinition, thermal dissipative effect and noncanonical effect to
the non-Gaussianity in noncanonical warm inflation.Comment: 7 pages. Accepted for publication in Physical Review
A new one-dimensional variable frequency photonic crystals
In this paper, we have firstly proposed a new one-dimensional variable
frequency photonic crystals (VFPCs). We have calculated the transmissivity and
the electronic field distribution of VFPCs and compare them with the
conventional PCs, and obtained some new results, which should be help to design
a new type optical devices, and the two-dimensional and three-dimensional VFPCs
can be studied further.Comment: arXiv admin note: text overlap with arXiv:1301.6109 by other author
RDPD: Rich Data Helps Poor Data via Imitation
In many situations, we need to build and deploy separate models in related
environments with different data qualities. For example, an environment with
strong observation equipments (e.g., intensive care units) often provides
high-quality multi-modal data, which are acquired from multiple sensory devices
and have rich-feature representations. On the other hand, an environment with
poor observation equipment (e.g., at home) only provides low-quality, uni-modal
data with poor-feature representations. To deploy a competitive model in a
poor-data environment without requiring direct access to multi-modal data
acquired from a rich-data environment, this paper develops and presents a
knowledge distillation (KD) method (RDPD) to enhance a predictive model trained
on poor data using knowledge distilled from a high-complexity model trained on
rich, private data. We evaluated RDPD on three real-world datasets and shown
that its distilled model consistently outperformed all baselines across all
datasets, especially achieving the greatest performance improvement over a
model trained only on low-quality data by 24.56% on PR-AUC and 12.21% on
ROC-AUC, and over that of a state-of-the-art KD model by 5.91% on PR-AUC and
4.44% on ROC-AUC.Comment: Published in IJCAI 201
Meson spectrum in Regge phenomenology
Under the assumption that both light and heavy quarkonia populate
approximately linear Regge trajectories with the requirements of additivity of
intercepts and inverse slopes, the masses of different meson multiplets are
estimated. The predictions derived from the quasi-linear Regge trajectories are
in reasonable agreement with those given by many other references.Comment: 21 pages, to appear in Eur. Phys. J.
Understanding Image Quality and Trust in Peer-to-Peer Marketplaces
As any savvy online shopper knows, second-hand peer-to-peer marketplaces are
filled with images of mixed quality. How does image quality impact marketplace
outcomes, and can quality be automatically predicted? In this work, we
conducted a large-scale study on the quality of user-generated images in
peer-to-peer marketplaces. By gathering a dataset of common second-hand
products (~75,000 images) and annotating a subset with human-labeled quality
judgments, we were able to model and predict image quality with decent accuracy
(~87%). We then conducted two studies focused on understanding the relationship
between these image quality scores and two marketplace outcomes: sales and
perceived trustworthiness. We show that image quality is associated with higher
likelihood that an item will be sold, though other factors such as view count
were better predictors of sales. Nonetheless, we show that high quality
user-generated images selected by our models outperform stock imagery in
eliciting perceptions of trust from users. Our findings can inform the design
of future marketplaces and guide potential sellers to take better product
images.Comment: WACV 201
Primordial non-Gaussianity in warm inflation using formalism
A formalism is used to study the non-Gaussianity of the primordial
curvature perturbation on an uniform density hypersurfaces generated by the
warm inflation for the first time. After introducing the framework of the warm
inflation and the formalism, we obtain an analytic expression for
the nonlinear parameter that describes the non-Gaussianity in slow
roll approximation, and find that the formalism gives a very good
result. We analyse the magnitude of and compare our result with those
of the standard inflation. Then we discuss two concrete examples: the quartic
chaotic model and the hilltop model. The quartic potential model can again be
in very good agreement with the Planck results in the warm inflationary
scenario, and we give out the concrete results of how the nonlinear parameter
depends on the dissipation strength of the warm inflation and the amounts of
expansion. We find that the range of the nonlinear parameters in these two
cases are both well inside of the allowed region of Planck.Comment: 9 pages, 5 figure
Variable frequency photonic crystals
In this paper, we have firstly proposed a new one-dimensional variable
frequency photonic crystals (VFPCs), and calculated the transmissivity and the
electronic field distribution of VFPCs with and without defect layer, and
considered the effect of defect layer and variable frequency function on the
transmissivity and the electronic field distribution. We have obtained some new
characteristics for the VFPCs, which should be help to design a new type
optical devices.Comment: arXiv admin note: substantial text overlap with arXiv:1502.0511
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