10,692 research outputs found
Shakeout: A New Approach to Regularized Deep Neural Network Training
Recent years have witnessed the success of deep neural networks in dealing
with a plenty of practical problems. Dropout has played an essential role in
many successful deep neural networks, by inducing regularization in the model
training. In this paper, we present a new regularized training approach:
Shakeout. Instead of randomly discarding units as Dropout does at the training
stage, Shakeout randomly chooses to enhance or reverse each unit's contribution
to the next layer. This minor modification of Dropout has the statistical
trait: the regularizer induced by Shakeout adaptively combines , and
regularization terms. Our classification experiments with representative
deep architectures on image datasets MNIST, CIFAR-10 and ImageNet show that
Shakeout deals with over-fitting effectively and outperforms Dropout. We
empirically demonstrate that Shakeout leads to sparser weights under both
unsupervised and supervised settings. Shakeout also leads to the grouping
effect of the input units in a layer. Considering the weights in reflecting the
importance of connections, Shakeout is superior to Dropout, which is valuable
for the deep model compression. Moreover, we demonstrate that Shakeout can
effectively reduce the instability of the training process of the deep
architecture.Comment: Appears at T-PAMI 201
The low-noise optimisation method for gearbox in consideration of operating conditions
This paper presents a comprehensive procedure to calculate the steady dynamic response and the noise radiation generated from a stepping-down gearbox. In this process, the dynamic model of the cylindrical gear transmission system is built with the consideration of the time-varying mesh stiffness, gear errors and bearing supporting, while the data of dynamic bearing force is obtained through solving the model. Furthermore, taking the data of bearing force as the excitation, the gearbox vibrations and noise radiation are calculated by numerical simulation, and then the time history of node dynamic response, noise spectrum and resonance frequency range of the gearbox are obtained. Finally, the gearbox panel acoustic contribution at the resonance frequency range is calculated. Based on the conclusions from the gearbox panel acoustic contribution analyses and the mode shapes, two gearbox stiffness improving plans have been studied. By contrastive analysis of gearbox noise radiation, the effectiveness of the improving plans is confirmed. This study has provided useful theoretical guideline to the gearbox design
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