2,786 research outputs found
TIGS: An Inference Algorithm for Text Infilling with Gradient Search
Text infilling is defined as a task for filling in the missing part of a
sentence or paragraph, which is suitable for many real-world natural language
generation scenarios. However, given a well-trained sequential generative
model, generating missing symbols conditioned on the context is challenging for
existing greedy approximate inference algorithms. In this paper, we propose an
iterative inference algorithm based on gradient search, which is the first
inference algorithm that can be broadly applied to any neural sequence
generative models for text infilling tasks. We compare the proposed method with
strong baselines on three text infilling tasks with various mask ratios and
different mask strategies. The results show that our proposed method is
effective and efficient for fill-in-the-blank tasks, consistently outperforming
all baselines.Comment: The 57th Annual Meeting of the Association for Computational
Linguistics (ACL 2019
Revision in Continuous Space: Unsupervised Text Style Transfer without Adversarial Learning
Typical methods for unsupervised text style transfer often rely on two key
ingredients: 1) seeking the explicit disentanglement of the content and the
attributes, and 2) troublesome adversarial learning. In this paper, we show
that neither of these components is indispensable. We propose a new framework
that utilizes the gradients to revise the sentence in a continuous space during
inference to achieve text style transfer. Our method consists of three key
components: a variational auto-encoder (VAE), some attribute predictors (one
for each attribute), and a content predictor. The VAE and the two types of
predictors enable us to perform gradient-based optimization in the continuous
space, which is mapped from sentences in a discrete space, to find the
representation of a target sentence with the desired attributes and preserved
content. Moreover, the proposed method naturally has the ability to
simultaneously manipulate multiple fine-grained attributes, such as sentence
length and the presence of specific words, when performing text style transfer
tasks. Compared with previous adversarial learning based methods, the proposed
method is more interpretable, controllable and easier to train. Extensive
experimental studies on three popular text style transfer tasks show that the
proposed method significantly outperforms five state-of-the-art methods.Comment: Association for the Advancement of Artificial Intelligence. AAAI 202
Virtual Cellular Multi-period Formation under the Dynamic Environment
AbstractVirtual cellular manufacturing is an innovative way of production organization which both in the production of flexibility and efficient to meet today's rapid development of science and technology and replacement of products. The key process of the design of virtual cellular manufacturing system—cell formation is the focus of research. In order to meet the characteristics of small batch and dynamically changing market demand, this paper studies the problems of virtual cellular multi-period dynamic reconfiguration. A reconfigurable system programming model is developed. The model incorporates parameters of the problems of product dynamic demand, machine capacity, operation sequence, balanced workload, alternative routings and batch setting. The objective of mixed integer programming model is to minimize the total costs of operation, moving raw materials, inventory holding and process routes setup. Though a case study, demonstrates the feasibility and validity of the model in reality
Enhanced proton-boron nuclear fusion cross sections in intense high-frequency laser
We investigate the proton-boron nuclear fusion cross sections under the
influence of the intense linearly polarized monochromatic laser fields with
high frequency. First, we rewrite the time-dependent Schr\"{o}dinger equation
using Kramers-Henneberger (KH) transformation which allows for shifting all
time dependence of the problem into the potential function. Then, for the
intense laser fields that satisfy the high frequency limit, the time-averaged
scheme in the KH framework should be valid. We can use WKB approximation to
evaluate Coulomb barrier penetrability and then calculate proton-boron nuclear
fusion cross sections by a phenomenological Gamow form. We show that the
corresponding Coulomb barrier penetrability increases significantly due to the
depression of the time-averaged potential barrier. As a result, we find that
proton-boron nuclear fusion cross sections can be enhanced effectively
depending on a dimensionless quantity , which equals the ratio
of the quiver oscillation amplitude to the geometrical touching radius of the
proton and boron nucleus. For , we predict that the resonance
peak of the fusion cross-section is enhanced by about times at the
incident energy of keV. And for another incident energy of
keV, the resonance peak of fusion cross-section is not only
enhanced but also shifted to lower energy of keV due to the
mechanism of over-barrier fusion.Comment: arXiv admin note: text overlap with arXiv:2107.0308
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