21,942 research outputs found
Local Critic Training of Deep Neural Networks
This paper proposes a novel approach to train deep neural networks by
unlocking the layer-wise dependency of backpropagation training. The approach
employs additional modules called local critic networks besides the main
network model to be trained, which are used to obtain error gradients without
complete feedforward and backward propagation processes. We propose a cascaded
learning strategy for these local networks. In addition, the approach is also
useful from multi-model perspectives, including structural optimization of
neural networks, computationally efficient progressive inference, and ensemble
classification for performance improvement. Experimental results show the
effectiveness of the proposed approach and suggest guidelines for determining
appropriate algorithm parameters
Music Popularity: Metrics, Characteristics, and Audio-Based Prediction
Understanding music popularity is important not only for the artists who
create and perform music but also for the music-related industry. It has not
been studied well how music popularity can be defined, what its characteristics
are, and whether it can be predicted, which are addressed in this paper. We
first define eight popularity metrics to cover multiple aspects of popularity.
Then, the analysis of each popularity metric is conducted with long-term
real-world chart data to deeply understand the characteristics of music
popularity in the real world. We also build classification models for
predicting popularity metrics using acoustic data. In particular, we focus on
evaluating features describing music complexity together with other
conventional acoustic features including MPEG-7 and Mel-frequency cepstral
coefficient (MFCC) features. The results show that, although room still exists
for improvement, it is feasible to predict the popularity metrics of a song
significantly better than random chance based on its audio signal, particularly
using both the complexity and MFCC features
On the twisted quadratic moment for Dirichlet L-functions
Given a positive integer, we give an explicit formula and an asymptotic
formula for where is the non-trivial
Dirichlet character mod with $f>c.
Regularization Methods for Generative Adversarial Networks: An Overview of Recent Studies
Despite its short history, Generative Adversarial Network (GAN) has been
extensively studied and used for various tasks, including its original purpose,
i.e., synthetic sample generation. However, applying GAN to different data
types with diverse neural network architectures has been hindered by its
limitation in training, where the model easily diverges. Such a notorious
training of GANs is well known and has been addressed in numerous studies.
Consequently, in order to make the training of GAN stable, numerous
regularization methods have been proposed in recent years. This paper reviews
the regularization methods that have been recently introduced, most of which
have been published in the last three years. Specifically, we focus on general
methods that can be commonly used regardless of neural network architectures.
To explore the latest research trends in the regularization for GANs, the
methods are classified into several groups by their operation principles, and
the differences between the methods are analyzed. Furthermore, to provide
practical knowledge of using these methods, we investigate popular methods that
have been frequently employed in state-of-the-art GANs. In addition, we discuss
the limitations in existing methods and propose future research directions
Stationary Perturbation Theory with Spatially Well-separated Potentials
We present a new perturbation theory for quantum mechanical energy
eigenstates when the potential equals the sum of two localized, but not
necessarily weak potentials and , with the
distance between the respective centers of the two taken to be quite large.
It is assumed that complete eigenfunctions of the local Hamiltonians (i.e., in
the presence of or only) are available as
inputs to our perturbation theory. If the two local Hamiltonians have
degenerate bound-state energy levels, a systematic extension of the molecular
orbital theory (or the tight-binding approximation) follows from our formalism.
Our approach can be viewed as a systematic adaptation of the multiple
scattering theory to the problem of bound states.Comment: 22 pages, no figures; uses revtex
Controllable Generative Adversarial Network
Recently introduced generative adversarial network (GAN) has been shown
numerous promising results to generate realistic samples. The essential task of
GAN is to control the features of samples generated from a random distribution.
While the current GAN structures, such as conditional GAN, successfully
generate samples with desired major features, they often fail to produce
detailed features that bring specific differences among samples. To overcome
this limitation, here we propose a controllable GAN (ControlGAN) structure. By
separating a feature classifier from a discriminator, the generator of
ControlGAN is designed to learn generating synthetic samples with the specific
detailed features. Evaluated with multiple image datasets, ControlGAN shows a
power to generate improved samples with well-controlled features. Furthermore,
we demonstrate that ControlGAN can generate intermediate features and opposite
features for interpolated and extrapolated input labels that are not used in
the training process. It implies that ControlGAN can significantly contribute
to the variety of generated samples.Comment: A fully revised version of this paper is published in IEEE Access.
Please refer to https://doi.org/10.1109/ACCESS.2019.289910
Dyonic Instanton as Supertube between D4 Branes
We study dyonic instantons in (4+1) dimensional Yang-Mills theory. Especially
we consider the most general two instanton solution given by the
Jackiw-Nohl-Rebbi ansatz and find its dyonic version. By exploring the zeros of
the Higgs field, we rederive the porism structure of triangles in this solution
and also find the magnetic monopole string loop. This leads to the
identification of dyonic instanton with the supertube inserted between D4
branes.Comment: 16 pages, 2 figures, JHEP styl
The Geometry of Dyonic Instantons in 5-dimensional Supergravity
We systematically construct and study smooth supersymmetric solutions in 5
dimensional N=1 Yang-Mills-Einstein supergravity. Our solution is based on the
ADHM construction of (dyonic) multi-instantons in Yang-Mills theory, which
extends to the gravity-coupled system. In a simple supergravity model obtained
from N=2 theory, our solutions are regular ring-like configurations, which can
also be interpreted as supertubes. By studying the SU(2) 2-instanton example in
detail, we find that angular momentum is maximized, with fixed electric charge,
for circular rings. This feature is qualitatively same as that of supertubes.
Related to the existence of this upper bound of angular momentum, we also check
the absence of closed timelike curves for the circular rings. Finally, in
supergravity and gauge theory models with non-Abelian Chern-Simons terms, we
point out that the solution in the symmetric phase carries electric charge
which does not contribute to the energy. A possible explanation from the
dynamics on the instanton moduli space is briefly discussed.Comment: 35 pages, no figure
Equilibria in a large production economy with an infinite dimensional commodity space and price dependent preferences
We prove the existence of a competitive equilibrium in a production economy
with infinitely many commodities and a measure space of agents whose
preferences are price dependent. We employ a saturated measure space for the
set of agents and apply recent results for an infinite dimensional separable
Banach space such as Lyapunov's convexity theorem and an exact Fatou's lemma to
obtain the result.Comment: JEL Classification Numbers: C62, D51. Keywords: Separable Banach
space, Saturated measure space, Price dependent preferences, Lyapunov's
convexity theorem, Fatou's lemm
Quantum reservoir engineering through quadratic optomechanical interaction in the reversed dissipation regime
We explore the electromagnetic field coupled to a mechanical resonator via
quadratic optomechanical interaction in the reversed dissipation regime where
the mechanical damping rate is much larger than the cavity field dissipation
rate. It is shown that in this regime, the cavity field effectively acquires an
additional reservoir which is conditioned by the temperature of the mechanical
bath as well as the mechanical damping rate. We analytically find the
steady-state mean photon number and the critical temperature of the mechanical
oscillator to cool or heat the coupled electromagnetic field. We also show that
in the case of quadratic coupling, the temperature of the mechanical oscillator
can be estimated in the quantum regime by observing the noise spectrum of the
cavity field
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