27 research outputs found
Higher order Dependency of Chaotic Maps
Some higher-order statistical dependency aspects
of chaotic maps are presented. The autocorrelation
function (ACF) of the mean-adjusted squares, termed the
quadratic autocorrelation function, is used to access nonlinear
dependence of the maps under consideration. A simple
analytical expression for the quadratic ACF has been
found in the case of fully stretching piece-wise linear maps.
A minimum bit energy criterion from chaos communications
is used to motivate choosing maps with strong negative
quadratic autocorrelation. A particular map in this
class, a so-called deformed circular map, is derived which
performs better than other well-known chaotic maps when
used for spreading sequences in chaotic shift-key communication
systems
Optimal Spreading Sequences for Chaos-Based Communication Systems
As a continuation from [2], some higherorder
statistical dependency aspects of chaotic spreading
sequences used in communication systems are presented.
The autocorrelation function (ACF) of the mean-adjusted
squares, termed the quadratic autocorrelation function,
forms the building block of nonlinear dependence assessment
of the family of spreading sequences under investigation.
Explicit results are provided for the theoretical lower
bound, the so-called Fr´echet lower bound, of the quadratic
ACF of that family. A method for producing a spreading
sequence which attains the Fr´echet bound is introduced
Topological Deep Learning: Going Beyond Graph Data
Topological deep learning is a rapidly growing field that pertains to the
development of deep learning models for data supported on topological domains
such as simplicial complexes, cell complexes, and hypergraphs, which generalize
many domains encountered in scientific computations. In this paper, we present
a unifying deep learning framework built upon a richer data structure that
includes widely adopted topological domains.
Specifically, we first introduce combinatorial complexes, a novel type of
topological domain. Combinatorial complexes can be seen as generalizations of
graphs that maintain certain desirable properties. Similar to hypergraphs,
combinatorial complexes impose no constraints on the set of relations. In
addition, combinatorial complexes permit the construction of hierarchical
higher-order relations, analogous to those found in simplicial and cell
complexes. Thus, combinatorial complexes generalize and combine useful traits
of both hypergraphs and cell complexes, which have emerged as two promising
abstractions that facilitate the generalization of graph neural networks to
topological spaces.
Second, building upon combinatorial complexes and their rich combinatorial
and algebraic structure, we develop a general class of message-passing
combinatorial complex neural networks (CCNNs), focusing primarily on
attention-based CCNNs. We characterize permutation and orientation
equivariances of CCNNs, and discuss pooling and unpooling operations within
CCNNs in detail.
Third, we evaluate the performance of CCNNs on tasks related to mesh shape
analysis and graph learning. Our experiments demonstrate that CCNNs have
competitive performance as compared to state-of-the-art deep learning models
specifically tailored to the same tasks. Our findings demonstrate the
advantages of incorporating higher-order relations into deep learning models in
different applications
New genetic loci link adipose and insulin biology to body fat distribution.
Body fat distribution is a heritable trait and a well-established predictor of adverse metabolic outcomes, independent of overall adiposity. To increase our understanding of the genetic basis of body fat distribution and its molecular links to cardiometabolic traits, here we conduct genome-wide association meta-analyses of traits related to waist and hip circumferences in up to 224,459 individuals. We identify 49 loci (33 new) associated with waist-to-hip ratio adjusted for body mass index (BMI), and an additional 19 loci newly associated with related waist and hip circumference measures (P < 5 × 10(-8)). In total, 20 of the 49 waist-to-hip ratio adjusted for BMI loci show significant sexual dimorphism, 19 of which display a stronger effect in women. The identified loci were enriched for genes expressed in adipose tissue and for putative regulatory elements in adipocytes. Pathway analyses implicated adipogenesis, angiogenesis, transcriptional regulation and insulin resistance as processes affecting fat distribution, providing insight into potential pathophysiological mechanisms
Zero variance differential geometric markov chain monte carlo algorithms
Differential geometric Markov Chain Monte Carlo (MCMC) strategies exploit the geometry of the target to achieve convergence in fewer MCMC iterations at the cost of increased computing time for each of the iterations. Such computational complexity is regarded as a potential shortcoming of geometric MCMC in practice. This paper suggests that part of the additional computing required by Hamiltonian Monte Carlo and Metropolis adjusted Langevin algorithms produces elements that allow concurrent implementation of the zero variance reduction technique for MCMC estimation. Therefore, zero variance geometric MCMC emerges as an inherently unified sampling scheme, in the sense that variance reduction and geometric exploitation of the parameter space can be performed simultaneously without exceeding the computational requirements posed by the geometric MCMC scheme alone. A MATLAB package is provided, which implements a generic code framework of the combined methodology for a range of models. © 2014 International Society for Bayesian Analysis
The Controlled Thermodynamic Integral for Bayesian Model Evidence Evaluation
© 2016, © American Statistical Association. Approximation of the model evidence is well known to be challenging. One promising approach is based on thermodynamic integration, but a key concern is that the thermodynamic integral can suffer from high variability in many applications. This article considers the reduction of variance that can be achieved by exploiting control variates in this setting. Our methodology applies whenever the gradient of both the log-likelihood and the log-prior with respect to the parameters can be efficiently evaluated. Results obtained on regression models and popular benchmark datasets demonstrate a significant and sometimes dramatic reduction in estimator variance and provide insight into the wider applicability of control variates to evidence estimation. Supplementary materials for this article are available online
The Controlled Thermodynamic Integral for Bayesian Model Evidence Evaluation
Approximation of the model evidence is well known to be challenging. One promising approach is based on thermodynamic integration, but a key concern is that the thermodynamic integral can suffer from high variability in many applications. This article considers the reduction of variance that can be achieved by exploiting control variates in this setting. Our methodology applies whenever the gradient of both the log-likelihood and the log-prior with respect to the parameters can be efficiently evaluated. Results obtained on regression models and popular benchmark datasets demonstrate a significant and sometimes dramatic reduction in estimator variance and provide insight into the wider applicability of control variates to evidence estimation. Supplementary materials for this article are available online
RNA editing generates cellular subsets with diverse sequence within populations
© The Author(s) 2016. RNA editing is a mutational mechanism that specifically alters the nucleotide content in transcribed RNA. However, editing rates vary widely, and could result from equivalent editing amongst individual cells, or represent an average of variable editing within a population. Here we present a hierarchical Bayesian model that quantifies the variance of editing rates at specific sites using RNA-seq data from both single cells, and a cognate bulk sample to distinguish between these two possibilities. The model predicts high variance for specific edited sites in murine macrophages and dendritic cells, findings that we validated experimentally by using targeted amplification of specific editable transcripts from single cells. The model also predicts changes in variance in editing rates for specific sites in dendritic cells during the course of LPS stimulation. Our data demonstrate substantial variance in editing signatures amongst single cells, supporting the notion that RNA editing generates diversity within cellular populations
The Controlled Thermodynamic Integral for Bayesian Model Comparison
Bayesian model comparison relies upon the model evidence, yet for many models of interest the model evidence is unavailable in closed form and must be approximated. Many of the estimators for evidence that have been proposed in the Monte Carlo literature suffer from high variability. This paper considers the reduction of variance that can be achieved by exploiting control variates in this setting. Our methodology is based on thermodynamic integration and applies whenever the gradient of both the log-likelihood and the log-prior with respect to the parameters can be efficiently evaluated. Results obtained on regression models and popular benchmark datasets demonstrate a significant and sometimes dramatic reduction in estimator variance and provide insight into the wider applicability of control variates to Bayesian model comparison