18,306 research outputs found
Weakly-Supervised Neural Text Classification
Deep neural networks are gaining increasing popularity for the classic text
classification task, due to their strong expressive power and less requirement
for feature engineering. Despite such attractiveness, neural text
classification models suffer from the lack of training data in many real-world
applications. Although many semi-supervised and weakly-supervised text
classification models exist, they cannot be easily applied to deep neural
models and meanwhile support limited supervision types. In this paper, we
propose a weakly-supervised method that addresses the lack of training data in
neural text classification. Our method consists of two modules: (1) a
pseudo-document generator that leverages seed information to generate
pseudo-labeled documents for model pre-training, and (2) a self-training module
that bootstraps on real unlabeled data for model refinement. Our method has the
flexibility to handle different types of weak supervision and can be easily
integrated into existing deep neural models for text classification. We have
performed extensive experiments on three real-world datasets from different
domains. The results demonstrate that our proposed method achieves inspiring
performance without requiring excessive training data and outperforms baseline
methods significantly.Comment: CIKM 2018 Full Pape
(3-PyridÂyl)methanaminium 4-nitroÂphenolate 4-nitroÂphenol solvate
In the crystal structure of the title compound, C6H9N2
+·C6H4NO3
−·C6H5NO3, ions and molÂecules are connected via interÂmolecular N—H⋯O, N—H⋯N, O—H⋯O and C—H⋯O hydrogen bonds into a three-dimensional network
Performance Limits and Geometric Properties of Array Localization
Location-aware networks are of great importance and interest in both civil
and military applications. This paper determines the localization accuracy of
an agent, which is equipped with an antenna array and localizes itself using
wireless measurements with anchor nodes, in a far-field environment. In view of
the Cram\'er-Rao bound, we first derive the localization information for static
scenarios and demonstrate that such information is a weighed sum of Fisher
information matrices from each anchor-antenna measurement pair. Each matrix can
be further decomposed into two parts: a distance part with intensity
proportional to the squared baseband effective bandwidth of the transmitted
signal and a direction part with intensity associated with the normalized
anchor-antenna visual angle. Moreover, in dynamic scenarios, we show that the
Doppler shift contributes additional direction information, with intensity
determined by the agent velocity and the root mean squared time duration of the
transmitted signal. In addition, two measures are proposed to evaluate the
localization performance of wireless networks with different anchor-agent and
array-antenna geometries, and both formulae and simulations are provided for
typical anchor deployments and antenna arrays.Comment: to appear in IEEE Transactions on Information Theor
An Attention-based Collaboration Framework for Multi-View Network Representation Learning
Learning distributed node representations in networks has been attracting
increasing attention recently due to its effectiveness in a variety of
applications. Existing approaches usually study networks with a single type of
proximity between nodes, which defines a single view of a network. However, in
reality there usually exists multiple types of proximities between nodes,
yielding networks with multiple views. This paper studies learning node
representations for networks with multiple views, which aims to infer robust
node representations across different views. We propose a multi-view
representation learning approach, which promotes the collaboration of different
views and lets them vote for the robust representations. During the voting
process, an attention mechanism is introduced, which enables each node to focus
on the most informative views. Experimental results on real-world networks show
that the proposed approach outperforms existing state-of-the-art approaches for
network representation learning with a single view and other competitive
approaches with multiple views.Comment: CIKM 201
Type-II Dirac points and Dirac nodal loops on the magnons of square-hexagon-octagon lattice
We study topological magnons on an anisotropic square-hexagon-octagon (SHO)
lattice which has been found by a two-dimensional Biphenylene network (BPN). We
propose the concepts of type-II Dirac magnonic states where new schemes to
achieve topological magnons are unfolded without requiring the
Dzyaloshinsky-Moriya interactions (DMIs). In the ferromagnetic states, the
topological distinctions at the type-II Dirac points along with one-dimensional
(1D) closed lines of Dirac magnon nodes are characterized by the
invariant. We find pair annihilation of the Dirac magnons and use the Wilson
loop method to depict the topological protection of the band-degeneracy. The
Green's function approach is used to calculte chiral edge modes and magnon
density of states (DOS). We introduce the DMIs to gap the type-II Dirac magnon
points and demonstrate the Dirac nodal loops (DNLs) are robust against the DMIs
within a certain parameter range. The topological phase diagram of magnon bands
is given via calculating the Berry curvature and Chern number. We find that the
anomalous thermal Hall conductivity gives connection to the magnon edge
current. Furthermore, we derive the differential gyromagnetic ratio to exhibit
the Einstein-de Haas effect (EdH) of magnons with topological features.Comment: arXiv admin note: text overlap with arXiv:2207.0288
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