9,782 research outputs found
Federated Generative Adversarial Learning
This work studies training generative adversarial networks under the
federated learning setting. Generative adversarial networks (GANs) have
achieved advancement in various real-world applications, such as image editing,
style transfer, scene generations, etc. However, like other deep learning
models, GANs are also suffering from data limitation problems in real cases. To
boost the performance of GANs in target tasks, collecting images as many as
possible from different sources becomes not only important but also essential.
For example, to build a robust and accurate bio-metric verification system,
huge amounts of images might be collected from surveillance cameras, and/or
uploaded from cellphones by users accepting agreements. In an ideal case,
utilize all those data uploaded from public and private devices for model
training is straightforward. Unfortunately, in the real scenarios, this is hard
due to a few reasons. At first, some data face the serious concern of leakage,
and therefore it is prohibitive to upload them to a third-party server for
model training; at second, the images collected by different kinds of devices,
probably have distinctive biases due to various factors, ,
collector preferences, geo-location differences, which is also known as "domain
shift". To handle those problems, we propose a novel generative learning scheme
utilizing a federated learning framework. Following the configuration of
federated learning, we conduct model training and aggregation on one center and
a group of clients. Specifically, our method learns the distributed generative
models in clients, while the models trained in each client are fused into one
unified and versatile model in the center. We perform extensive experiments to
compare different federation strategies, and empirically examine the
effectiveness of federation under different levels of parallelism and data
skewness
Hyperbolic Modules of Finite Group Algebras over Finite Fields of Characteristic Two
Let be a finite group and let be a finite field of characteristic
. We introduce \emph{-special subgroups} and \emph{-special elements}
of . In the case where contains a th primitive root of unity for each
odd prime dividing the order of (e.g. it is the case once is a
splitting field for all subgroups of ), the -special elements of
coincide with real elements of odd order. We prove that a symmetric -module
is hyperbolic if and only if the restriction of to every
-special subgroup of is hyperbolic, and also, if and only if the
characteristic polynomial on defined by every -special element of is
a square of a polynomial over . Some immediate applications to characters,
self-dual codes and Witt groups are given
Possible -like dibaryon states with heavy quarks
Possible -like dibaryon states and
are investigated within the framework of quark
delocalization color screening model. The results show that the interaction
between two 's is repulsive, so it cannot be bound state by
itself. However, the strong attraction in and
channels and the strong channel coupling, due to
the central interaction of one-gluon-exchange and one-pion-exchange, among
, and
push the energy of system below the threshold of
by MeV. The corresponding system
has the similar properties as that of
system, and a bound state is also possible in
system.Comment: 6 pages, 4 figures, 3 table
Investigating the excited states through and decay channels
Inspired by the five newly observed states by the LHCb
detector, we study the states as the wave molecular
pentaquarks with , , , and
by solving the RGM equation in the framework of chiral quark
model. Both the energies and the decay widths are obtained in this work. Our
results suggest that can be explained as an wave
resonance state of with , and the decay channels
are the wave and . Other reported
states cannot be obtained in our present calculation. Another
state with much higher mass 3533 MeV with
is also obtained. In addition, the calculation is
extended to the states, similar results as that of
are obtained.Comment: 6 pages, 2 figure
The effect of hidden color channels on Nucleon-Nucleon interaction
This letter reports the nucleon-nucleon() interaction obtained from
multi-channel, including hidden color channels, coupling quark model
calculation. The results show that the hidden color channels coupling provides
the intermediate range attraction which is usually assumed to be due to
multi- or meson exchange and that the short and intermediate
range interaction can be described solely by the fundamental quark-gluon
degree of freedom of QCD.Comment: 5 pages, 5 figure
Interpreting and as charged tetraquark states
In the framework of color flux-tube model with a four-body confinement
potential, the lowest charged tetraquark states
are studied by using the variational
method, Gaussian expansion method. The results indicate that some compact
resonance states can be formed, the states can not decay into two color singlet
mesons and through the breakdown and recombination of
color flux tubes but into and . The four-body
confinement potential is an crucial dynamical mechanism for the formation of
states, The decay mechanism is similar to that of compound nucleus and
therefore the states should be called "color confined, multi-quark resonance"
states. The newly observed charged states and
can be accommodated in the color flux-tube model and can be interpreted as the
-wave tetraquark states with quantum numbers
and and 2, respectively.Comment: 8 pages, no figur
Further study of the dibaryon within constituent quark models
Inspired by the discovery of the dibaryon and the experimental search
of dibaryon with the STAR data, we study the strange dibaryon
further in the framework of quark delocalization color screening
model and chiral quark model. We have shown is a narrow resonance in
D-wave scattering before. However, the - scattering
data analysis is quite complicated. Here we calculate the low-energy
scattering phase shifts, scattering length, effective range and binding energy
to provide another approach of STAR data analysis. Our results show there
exists an "bound" state, which can be observed by the -
correlation analysis with RHIC and LHC data, or by the new developed automatic
scanning system at J-PARC. Besides, we also find that the hidden color
channel-coupling is important for the system to develop
intermediate-range attraction.Comment: 7 pages, 2 figure
Theoretical study of a resonance in partial wave of nucleon-nucleon scattering
Inspired by the recent results of the WASA-at-COSY Collaboration, in which
they found a resonance pole in the coupled - partial
waves as expected from the resonance hypothesis, we calculated the
resonance structure in the coupled - partial wave phase
shifts of nucleon-nucleon scattering in the framework of two constituent quark
models: the quark delocalization color screening model and the chiral quark
model. Our results show that there is a resonance in
the coupled and partial waves in both of
these two models, which is in accordance with the expectation from the
resonance structure. The resonance shape in the partial wave
is remarkable, whereas in the phase shifts there is a small
rise around the resonance energy. This result is in agreement with the recent
experimental observations of WASA-at-COSY Collaboration.Comment: 5 pages, 3 figure
The Representation Transformation of Multiquark Wave Functions
It is shown that the representation transformations of multiquark wave
functions between different coupling schemes are just the Racah coefficients of
the permutation group. The transformation coefficients between the flavor-spin
(FS) and the color-spin (CS) schemes are obtained. As an example, the expansion
of the physical bases in terms of symmetry bases in the CS scheme are given for
the interesting cases .Comment: 9 pages plus 5 tables, latex, no figure
Role of weak measurements on states ordering and monogamy of quantum correlation
The information-theoretic definition of quantum correlation, e.g., quantum
discord, is measurement dependent. By considering the more general quantum
measurements, weak measurements, which include the projective measurement as a
limiting case, we show that while weak measurements can enable one to capture
more quantumness of correlation in a state, it can also induce other
counterintuitive quantum effects. Specifically, we show that the general
measurements with different strengths can impose different orderings for
quantum correlations of some states. It can also modify the monogamous
character for certain classes of states as well which may diminish the
usefulness of quantum correlation as a resource in some protocols. In this
sense, we say that the weak measurements play a dual role in defining quantum
correlation.Comment: 6 pages, 5 figures, the final version as that published in Int. J.
Theor. Phy
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