261,251 research outputs found
Machine Learning Line Bundle Cohomologies of Hypersurfaces in Toric Varieties
Different techniques from machine learning are applied to the problem of
computing line bundle cohomologies of (hypersurfaces in) toric varieties. While
a naive approach of training a neural network to reproduce the cohomologies
fails in the general case, by inspecting the underlying functional form of the
data we propose a second approach. The cohomologies depend in a piecewise
polynomial way on the line bundle charges. We use unsupervised learning to
separate the different polynomial phases. The result is an analytic formula for
the cohomologies. This can be turned into an algorithm for computing analytic
expressions for arbitrary (hypersurfaces in) toric varieties.Comment: 8 pages, 6 figures, 5 tables; typos corrected, reference added,
clarifications adde
Artificial Neural Network Approach to the Analytic Continuation Problem
Inverse problems are encountered in many domains of physics, with analytic
continuation of the imaginary Green's function into the real frequency domain
being a particularly important example. However, the analytic continuation
problem is ill defined and currently no analytic transformation for solving it
is known. We present a general framework for building an artificial neural
network (ANN) that solves this task with a supervised learning approach.
Application of the ANN approach to quantum Monte Carlo calculations and
simulated Green's function data demonstrates its high accuracy. By comparing
with the commonly used maximum entropy approach, we show that our method can
reach the same level of accuracy for low-noise input data, while performing
significantly better when the noise strength increases. The computational cost
of the proposed neural network approach is reduced by almost three orders of
magnitude compared to the maximum entropy methodComment: 6 pages, 4 figures, supplementary material available as ancillary
fil
BL-MNE: Emerging Heterogeneous Social Network Embedding through Broad Learning with Aligned Autoencoder
Network embedding aims at projecting the network data into a low-dimensional
feature space, where the nodes are represented as a unique feature vector and
network structure can be effectively preserved. In recent years, more and more
online application service sites can be represented as massive and complex
networks, which are extremely challenging for traditional machine learning
algorithms to deal with. Effective embedding of the complex network data into
low-dimension feature representation can both save data storage space and
enable traditional machine learning algorithms applicable to handle the network
data. Network embedding performance will degrade greatly if the networks are of
a sparse structure, like the emerging networks with few connections. In this
paper, we propose to learn the embedding representation for a target emerging
network based on the broad learning setting, where the emerging network is
aligned with other external mature networks at the same time. To solve the
problem, a new embedding framework, namely "Deep alIgned autoencoder based
eMbEdding" (DIME), is introduced in this paper. DIME handles the diverse link
and attribute in a unified analytic based on broad learning, and introduces the
multiple aligned attributed heterogeneous social network concept to model the
network structure. A set of meta paths are introduced in the paper, which
define various kinds of connections among users via the heterogeneous link and
attribute information. The closeness among users in the networks are defined as
the meta proximity scores, which will be fed into DIME to learn the embedding
vectors of users in the emerging network. Extensive experiments have been done
on real-world aligned social networks, which have demonstrated the
effectiveness of DIME in learning the emerging network embedding vectors.Comment: 10 pages, 9 figures, 4 tables. Full paper is accepted by ICDM 2017,
In: Proceedings of the 2017 IEEE International Conference on Data Mining
Investigating the generalizability of EEG-based Cognitive Load Estimation Across Visualizations
We examine if EEG-based cognitive load (CL) estimation is generalizable
across the character, spatial pattern, bar graph and pie chart-based
visualizations for the nback~task. CL is estimated via two recent approaches:
(a) Deep convolutional neural network, and (b) Proximal support vector
machines. Experiments reveal that CL estimation suffers across visualizations
motivating the need for effective machine learning techniques to benchmark
visual interface usability for a given analytic task
Stacking-based Deep Neural Network: Deep Analytic Network on Convolutional Spectral Histogram Features
Stacking-based deep neural network (S-DNN), in general, denotes a deep neural
network (DNN) resemblance in terms of its very deep, feedforward network
architecture. The typical S-DNN aggregates a variable number of individually
learnable modules in series to assemble a DNN-alike alternative to the targeted
object recognition tasks. This work likewise devises an S-DNN instantiation,
dubbed deep analytic network (DAN), on top of the spectral histogram (SH)
features. The DAN learning principle relies on ridge regression, and some key
DNN constituents, specifically, rectified linear unit, fine-tuning, and
normalization. The DAN aptitude is scrutinized on three repositories of varying
domains, including FERET (faces), MNIST (handwritten digits), and CIFAR10
(natural objects). The empirical results unveil that DAN escalates the SH
baseline performance over a sufficiently deep layer.Comment: 5 page
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