2,775 research outputs found
Attention Clusters: Purely Attention Based Local Feature Integration for Video Classification
Recently, substantial research effort has focused on how to apply CNNs or
RNNs to better extract temporal patterns from videos, so as to improve the
accuracy of video classification. In this paper, however, we show that temporal
information, especially longer-term patterns, may not be necessary to achieve
competitive results on common video classification datasets. We investigate the
potential of a purely attention based local feature integration. Accounting for
the characteristics of such features in video classification, we propose a
local feature integration framework based on attention clusters, and introduce
a shifting operation to capture more diverse signals. We carefully analyze and
compare the effect of different attention mechanisms, cluster sizes, and the
use of the shifting operation, and also investigate the combination of
attention clusters for multimodal integration. We demonstrate the effectiveness
of our framework on three real-world video classification datasets. Our model
achieves competitive results across all of these. In particular, on the
large-scale Kinetics dataset, our framework obtains an excellent single model
accuracy of 79.4% in terms of the top-1 and 94.0% in terms of the top-5
accuracy on the validation set. The attention clusters are the backbone of our
winner solution at ActivityNet Kinetics Challenge 2017. Code and models will be
released soon.Comment: The backbone of the winner solution at ActivityNet Kinetics Challenge
201
Microarray-based gene expression profiles of silkworm brains
<p>Abstract</p> <p>Background</p> <p>Molecular genetic studies of <it>Bombyx mori </it>have led to profound advances in our understanding of the regulation of development. <it>Bombyx mori </it>brain, as a main endocrine organ, plays important regulatory roles in various biological processes. Microarray technology will allow the genome-wide analysis of gene expression patterns in silkworm brains.</p> <p>Results</p> <p>We reported microarray-based gene expression profiles in silkworm brains at four stages including V7, P1, P3 and P5. A total of 4,550 genes were transcribed in at least one selected stage. Of these, clustering algorithms separated the expressed genes into stably expressed genes and variably expressed genes. The results of the gene ontology (GO) and Kyoto encyclopedia of genes and genomes (KEGG) analysis of stably expressed genes showed that the ribosomal and oxidative phosphorylation pathways were principal pathways. Secondly, four clusters of genes with significantly different expression patterns were observed in the 1,175 variably expressed genes. Thirdly, thirty-two neuropeptide genes, six neuropeptide-like precursor genes, and 117 cuticular protein genes were expressed in selected developmental stages.</p> <p>Conclusion</p> <p>Major characteristics of the transcriptional profiles in the brains of <it>Bombyx mori </it>at specific development stages were present in this study. Our data provided useful information for future research.</p
A minimal modular invariant neutrino model
We present a neutrino mass model based on modular symmetry with the fewest
input parameters to date, which successfully accounts for the 12 lepton masses
and mixing parameters through 6 real free parameters including the modulus. The
neutrino masses are predicted to be normal ordering, the atmospheric angle
is quite close to maximal value and the Dirac CP phase
is about . We also study the soft supersymmetry breaking
terms due to the modulus -term in this minimal model, which are constrained
to be the non-holomorphic modular forms. The radiative lepton flavor violation
process is discussed.Comment: 24 pages, 4 figure
Modular symmetry origin of texture zeros and quark lepton unification
The even weight modular forms of level can be arranged into the common
irreducible representations of the inhomogeneous finite modular group
and the homogeneous finite modular group which is the
double covering of , and the odd weight modular forms of level
transform in the new representations of . We find that the above
structure of modular forms can naturally generate texture zeros of the fermion
mass matrices if we properly assign the representations and weights of the
matter fields under the modular group. We perform a comprehensive analysis for
the modular symmetry. The three generations of left-handed
quarks are assumed to transform as a doublet and a singlet of , we find six
possible texture zeros structures of quark mass matrix up to row and column
permutations. We present five benchmark quark models which can produce very
good fit to the experimental data. These quark models are further extended to
include lepton sector, the resulting models can give a unified description of
both quark and lepton masses and flavor mixing simultaneously although they
contain less number of free parameters than the observables.Comment: 36 pages, 2 figur
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