262 research outputs found
Efficient Private ERM for Smooth Objectives
In this paper, we consider efficient differentially private empirical risk
minimization from the viewpoint of optimization algorithms. For strongly convex
and smooth objectives, we prove that gradient descent with output perturbation
not only achieves nearly optimal utility, but also significantly improves the
running time of previous state-of-the-art private optimization algorithms, for
both -DP and -DP. For non-convex but smooth
objectives, we propose an RRPSGD (Random Round Private Stochastic Gradient
Descent) algorithm, which provably converges to a stationary point with privacy
guarantee. Besides the expected utility bounds, we also provide guarantees in
high probability form. Experiments demonstrate that our algorithm consistently
outperforms existing method in both utility and running time
Exploring diastereoselectivity mechanism of L-threonine aldolase
Please click Additional Files below to see the full abstract
Dissipative elastic metamaterial with a lowfrequency passband
We design and experimentally demonstrate a dissipative elastic metamaterial structure that functions as a bandpass filter with a low-frequency passband. The mechanism of dissipation in this structure is well described by a mass-spring-damper model that reveals that the imaginary part of the wavenumber is non-zero, even in the passband of dissipative metamaterials. This indicates that transmittance in this range can be low. A prototype for this viscoelastic metamaterial model is fabricated by 3D printing techniques using soft and hard acrylics as constituent materials. The transmittance of the printed metamaterial is measured and shows good agreement with theoretical predictions, demonstrating its potential in the design of compact waveguides, filters and other advanced devices for controlling mechanical waves
TcruziDB: an integrated, post-genomics community resource for Trypanosoma cruzi
TcruziDB () is an integrated post-genomics database for the parasitic organism, Trypanosoma cruzi, the causative agent of Chagas' disease. TcruziDB was established in 2003 as a flat-file database with tools for mining the unannotated sequence reads and preliminary contig assemblies emerging from the Tri-Tryp genome consortium (TIGR/SBRI/Karolinska). Today, TcruziDB houses the recently published assembled genomic contigs and annotation provided by the genome consortium in a relational database supported by the Genomics Unified Schema (GUS) architecture. The combination of an annotated genome and a relational architecture has facilitated the integration of genomic data with expression data (proteomic and EST) and permitted the construction of automated analysis pipelines. TcruziDB has accepted, and will continue to accept the deposition of genomic and functional genomic datasets contributed by the research community
Dissipative elastic metamaterial with a lowfrequency passband
We design and experimentally demonstrate a dissipative elastic metamaterial structure that functions as a bandpass filter with a low-frequency passband. The mechanism of dissipation in this structure is well described by a mass-spring-damper model that reveals that the imaginary part of the wavenumber is non-zero, even in the passband of dissipative metamaterials. This indicates that transmittance in this range can be low. A prototype for this viscoelastic metamaterial model is fabricated by 3D printing techniques using soft and hard acrylics as constituent materials. The transmittance of the printed metamaterial is measured and shows good agreement with theoretical predictions, demonstrating its potential in the design of compact waveguides, filters and other advanced devices for controlling mechanical waves
A Dimensional Structure based Knowledge Distillation Method for Cross-Modal Learning
Due to limitations in data quality, some essential visual tasks are difficult
to perform independently. Introducing previously unavailable information to
transfer informative dark knowledge has been a common way to solve such hard
tasks. However, research on why transferred knowledge works has not been
extensively explored. To address this issue, in this paper, we discover the
correlation between feature discriminability and dimensional structure (DS) by
analyzing and observing features extracted from simple and hard tasks. On this
basis, we express DS using deep channel-wise correlation and intermediate
spatial distribution, and propose a novel cross-modal knowledge distillation
(CMKD) method for better supervised cross-modal learning (CML) performance. The
proposed method enforces output features to be channel-wise independent and
intermediate ones to be uniformly distributed, thereby learning semantically
irrelevant features from the hard task to boost its accuracy. This is
especially useful in specific applications where the performance gap between
dual modalities is relatively large. Furthermore, we collect a real-world CML
dataset to promote community development. The dataset contains more than 10,000
paired optical and radar images and is continuously being updated. Experimental
results on real-world and benchmark datasets validate the effectiveness of the
proposed method
- …