Hard Mixtures of Experts for Large Scale Weakly Supervised Vision

Training convolutional networks (CNN's) that fit on a single GPU with minibatch stochastic gradient descent has become effective in practice. However, there is still no effective method for training large CNN's that do not fit in the memory of a few GPU cards, or for parallelizing CNN training. In this work we show that a simple hard mixture of experts model can be efficiently trained to good effect on large scale hashtag (multilabel) prediction tasks. Mixture of experts models are not new (Jacobs et. al. 1991, Collobert et. al. 2003), but in the past, researchers have had to devise sophisticated methods to deal with data fragmentation. We show empirically that modern weakly supervised data sets are large enough to support naive partitioning schemes where each data point is assigned to a single expert. Because the experts are independent, training them in parallel is easy, and evaluation is cheap for the size of the model. Furthermore, we show that we can use a single decoding layer for all the experts, allowing a unified feature embedding space. We demonstrate that it is feasible (and in fact relatively painless) to train far larger models than could be practically trained with standard CNN architectures, and that the extra capacity can be well used on current datasets.Comment: Appearing in CVPR 201

Managed Retreat and the Life Estate: A Practical Path Forward for Coastal Communities

This paper focuses on a frequently discussed but rarely implemented solution to sea level rise: “managed retreat” away from at-risk and overdeveloped coastal areas. The paper begins by examining the threat posed by sea level rise through the lens of two contrasting municipalities: Miami, Florida and Nags Head, North Carolina. It then outlines the concept of managed retreat as well as the controversies surrounding this approach. Specifically, it examines the widespread voter hostility to condemnation efforts, the deterrent effect of inevitable legal challenges, and the financial burden of such efforts on cash-strapped municipalities. After analyzing these hurdles, the paper assesses government buyback programs as an alternative method of procuring at-risk coastal properties to facilitate managed retreat. After concluding that buyback programs are an insufficient substitute to eminent domain, the paper ultimately proposes that local authorities use life estates as a tool to mitigate the obstacles standing in the way of local governments doing what is best for their communities. This abstract has been adapted from the author\u27s introduction

Bamboo Hermitage [Editors\u27 Introduction]

N

About Our Contributors

N

In vitro bioconversion of polyphenols from black tea and red wine/grape juice by human intestinal microbiota displays strong interindividual variability

Dietary polyphenols in tea and wine have been associated with beneficial health effects. After ingestion, most polyphenols are metabolized by the colonic microbiota. The current study aimed at exploring the interindividual variation of gut microbial polyphenol bioconversion from 10 healthy human subjects. In vitro fecal batch fermentations simulating conditions in the distal colon were performed using polyphenols from black tea and a mixture of red wine and grape juice. Microbial bioconversion was monitored by NMR- and GC-MS-based profiling of diverse metabolites and phenolics. The complex polyphenol mixtures were degraded to a limited number of key metabolites. Each subject displayed a specific metabolite profile differing in composition and time courses as well as levels of these metabolites. Moreover, clear differences depending on the polyphenol sources were observed. In conclusion, varying metabolite pathways among individuals result in different metabolome profiles and therefore related health effects are hypothesized to differ between subjects

Management by Objectives-Based Groupware: Requirements for Efficient and Effective Achievements of Objectives

This paper is concerned with the challenges arising from the development of a groupware requirement specification for effective and efficient achievement of operative and strategic objectives in mass production industry. To analyze the process by which objectives are achieved, a systematical investigation using document analysis, participant observation, interviews and context scenario analysis was undertaken at a large manufacturing location with over 6 000 coworkers of a multinational automobile supplying company. The results of this in-depth analysis of objective achievement were utilized to develop a detailed requirement specification for a management by objectives groupware for use in mass production industry