1,030 research outputs found
Unitary cycles on Shimura curves and the Shimura lift I
This paper concerns two families of divisors, which we call the `orthogonal'
and `unitary' special cycles, defined on integral models of Shimura curves. The
orthogonal family was studied extensively by Kudla-Rapoport-Yang, who showed
that they are closely related to the Fourier coefficients of modular forms of
weight 3/2, while the `unitary' divisors are analogues of cycles appearing in
more recent work of Kudla-Rapoport on unitary Shimura varieties. Our main
result shows that these two families are related by (a formal version of) the
Shimura lift.Comment: 62 pages. Some material from arXiv:1309.2083v1 has been incorporated
here, and the main result has been strengthened. Also minor changes to
exposition and organizatio
Improper Intersections of Kudla-Rapoport divisors and Eisenstein series
We consider a certain family of Kudla-Rapoport cycles on an integral model of
a Shimura variety attached to a unitary group of signature (1,1), and prove
that the arithmetic degrees of these cycles can be identified with the Fourier
coefficients of the central derivative of an Eisenstein series of genus 2. The
integral model in question parametrizes abelian surfaces equipped with a
non-principal polarization and an action of an imaginary quadratic number ring,
and in this setting the cycles are degenerate: they may contain components of
positive dimension. This result can be viewed as confirmation, in the
degenerate setting and for dimension 2, of conjectures of Kudla and
Kudla-Rapoport that predict relations between the intersection numbers of
special cycles and the Fourier coefficients of automorphic forms
Learning a Fuzzy Hyperplane Fat Margin Classifier with Minimum VC dimension
The Vapnik-Chervonenkis (VC) dimension measures the complexity of a learning
machine, and a low VC dimension leads to good generalization. The recently
proposed Minimal Complexity Machine (MCM) learns a hyperplane classifier by
minimizing an exact bound on the VC dimension. This paper extends the MCM
classifier to the fuzzy domain. The use of a fuzzy membership is known to
reduce the effect of outliers, and to reduce the effect of noise on learning.
Experimental results show, that on a number of benchmark datasets, the the
fuzzy MCM classifier outperforms SVMs and the conventional MCM in terms of
generalization, and that the fuzzy MCM uses fewer support vectors. On several
benchmark datasets, the fuzzy MCM classifier yields excellent test set
accuracies while using one-tenth the number of support vectors used by SVMs.Comment: arXiv admin note: text overlap with arXiv:1410.457
A Simple and Effective Approach to the Story Cloze Test
In the Story Cloze Test, a system is presented with a 4-sentence prompt to a
story, and must determine which one of two potential endings is the 'right'
ending to the story. Previous work has shown that ignoring the training set and
training a model on the validation set can achieve high accuracy on this task
due to stylistic differences between the story endings in the training set and
validation and test sets. Following this approach, we present a simpler
fully-neural approach to the Story Cloze Test using skip-thought embeddings of
the stories in a feed-forward network that achieves close to state-of-the-art
performance on this task without any feature engineering. We also find that
considering just the last sentence of the prompt instead of the whole prompt
yields higher accuracy with our approach.Comment: 6 page
Deep Residual Network based food recognition for enhanced Augmented Reality application
Deep neural network based learning approaches is widely utilized for image
classification or object detection based problems with remarkable outcomes.
Realtime Object state estimation of objects can be used to track and estimate
the features that the object of the current frame possesses without causing any
significant delay and misclassification. A system that can detect the features
of such objects in the present state from camera images can be used to enhance
the application of Augmented Reality for improving user experience and
delivering information in a much perceptual way. The focus behind this paper is
to determine the most suitable model to create a low-latency assistance AR to
aid users by providing them nutritional information about the food that they
consume in order to promote healthier life choices. Hence the dataset has been
collected and acquired in such a manner, and we conduct various tests in order
to identify the most suitable DNN in terms of performance and complexity and
establish a system that renders such information realtime to the user.Comment: Total Pages:7 Total Figures:1
Learning Quantum Graphical Models using Constrained Gradient Descent on the Stiefel Manifold
Quantum graphical models (QGMs) extend the classical framework for reasoning
about uncertainty by incorporating the quantum mechanical view of probability.
Prior work on QGMs has focused on hidden quantum Markov models (HQMMs), which
can be formulated using quantum analogues of the sum rule and Bayes rule used
in classical graphical models. Despite the focus on developing the QGM
framework, there has been little progress in learning these models from data.
The existing state-of-the-art approach randomly initializes parameters and
iteratively finds unitary transformations that increase the likelihood of the
data. While this algorithm demonstrated theoretical strengths of HQMMs over
HMMs, it is slow and can only handle a small number of hidden states. In this
paper, we tackle the learning problem by solving a constrained optimization
problem on the Stiefel manifold using a well-known retraction-based algorithm.
We demonstrate that this approach is not only faster and yields better
solutions on several datasets, but also scales to larger models that were
prohibitively slow to train via the earlier method
Learning Hidden Quantum Markov Models
Hidden Quantum Markov Models (HQMMs) can be thought of as quantum
probabilistic graphical models that can model sequential data. We extend
previous work on HQMMs with three contributions: (1) we show how classical
hidden Markov models (HMMs) can be simulated on a quantum circuit, (2) we
reformulate HQMMs by relaxing the constraints for modeling HMMs on quantum
circuits, and (3) we present a learning algorithm to estimate the parameters of
an HQMM from data. While our algorithm requires further optimization to handle
larger datasets, we are able to evaluate our algorithm using several synthetic
datasets. We show that on HQMM generated data, our algorithm learns HQMMs with
the same number of hidden states and predictive accuracy as the true HQMMs,
while HMMs learned with the Baum-Welch algorithm require more states to match
the predictive accuracy
Distribution System Load and Forecast Model
This short document provides experimental evidence for the set of assumptions
on the mean load and forecast errors made in \cite{Sevlian2014A_Outage} and
\cite{Sevlian2014B_Outage}. We show that the mean load at any given node is
distributed normally, where we compute the mean and variance. We then present
an aggregation-error curve for a single day ahead forecaster. Residual analysis
shows that beyond 500 customers, gaussian residuals is a reasonable model. We
then show the forecaster has uncorrelated errors
Wrinkling instability of an inhomogeneously stretched viscous sheet
Motivated by the redrawing of hot glass into thin sheets, we investigate the
shape and stability of a thin viscous sheet that is inhomogeneously stretched
in an imposed non-uniform temperature field. We first determine the associated
base flow by solving the long-timescale stretching flow of a flat sheet as a
function of two dimensionless parameters: the normalized stretching velocity
, and a dimensionless width of the heating zone . This allows us
to determine the conditions for the onset of an out-of-plane wrinkling
instability stated in terms of an eigenvalue problem for a linear partial
differential equation governing the displacement of the midsurface of the
sheet. We show the sheet can become unstable in two regions that are upstream
and downstream of the heating zone where the minimum in-plane stress is
negative. This yields the shape and growth rates of the most unstable buckling
mode in both regions for various values of the stretching velocity and heating
zone width. A transition from stationary to oscillatory unstable modes is found
in the upstream region with increasing while the downstream region is
always stationary. We show that the wrinkling instability can be entirely
suppressed when the surface tension is large enough relative to the magnitude
of the in-plane stress. Finally, we present an operating diagram that indicates
regions of the parameter space that result in a required outlet sheet thickness
upon stretching, while simultaneously minimizing or suppressing the
out-of-plane buckling; a result that is relevant for the glass redraw method
used to create ultrathin glass sheets.Comment: 26 pages, 7 figure
An Alternative C++ based HPC system for Hadoop MapReduce
MapReduce is a technique used to vastly improve distributed processing of
data and can massively speed up computation. Hadoop and its MapReduce relies on
JVM and Java which is expensive on memory. High Performance Computing based
MapReduce framework could be used that can perform more memory-efficiently and
faster than the standard MapReduce. This paper explores an entirely C++ based
approach to the MapReduce and its feasibility on multiple factors like
developer friendliness, deployment interface, efficiency and scalability. This
paper also introduces Delayed Reduction and deployment techniques that can
speed up MapReduce in a compiled environment.Comment: 8 pages, 13 figures, 4 author
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