271 research outputs found
FiBiNET: Combining Feature Importance and Bilinear feature Interaction for Click-Through Rate Prediction
Advertising and feed ranking are essential to many Internet companies such as
Facebook and Sina Weibo. Among many real-world advertising and feed ranking
systems, click through rate (CTR) prediction plays a central role. There are
many proposed models in this field such as logistic regression, tree based
models, factorization machine based models and deep learning based CTR models.
However, many current works calculate the feature interactions in a simple way
such as Hadamard product and inner product and they care less about the
importance of features. In this paper, a new model named FiBiNET as an
abbreviation for Feature Importance and Bilinear feature Interaction NETwork is
proposed to dynamically learn the feature importance and fine-grained feature
interactions. On the one hand, the FiBiNET can dynamically learn the importance
of features via the Squeeze-Excitation network (SENET) mechanism; on the other
hand, it is able to effectively learn the feature interactions via bilinear
function. We conduct extensive experiments on two real-world datasets and show
that our shallow model outperforms other shallow models such as factorization
machine(FM) and field-aware factorization machine(FFM). In order to improve
performance further, we combine a classical deep neural network(DNN) component
with the shallow model to be a deep model. The deep FiBiNET consistently
outperforms the other state-of-the-art deep models such as DeepFM and extreme
deep factorization machine(XdeepFM).Comment: 8 pages,5 figure
Thawing k-essence dark energy in the PAge space
A broad class of dark energy models can be written in the form of k-essence,
whose Lagrangian density is a two-variable function of a scalar field
and its kinetic energy .
In the thawing scenario, the scalar field becomes dynamic only when the Hubble
friction drops below its mass scale in the late universe. Thawing k-essence
dark energy models can be randomly sampled by generating the Taylor expansion
coefficients of its Lagrangian density from random matrices \cite{thaws}. Ref.
\cite{thaws} points out that the non-uniform distribution of effective equation
of state parameters of thawing k-essence model can be used to
improve the statistics of model selection. The present work studies the
statistics of thawing k-essence in a more general framework that is
Parameterized by the Age of the universe (PAge) \cite{PAge}. For fixed matter
fraction , the random thawing k-essence models cluster in a narrow
band in the PAge parameter space, providing a strong theoretical prior. We
simulate cosmic shear power spectrum data for the Chinese Space Station
Telescope optical survey, and compare the fisher forecast with and without the
theoretical prior of thawing k-essence. For an optimal tomography binning
scheme, the theoretical prior improves the figure of merit in PAge space by a
factor of .Comment: 24 pages, 5 figures, submission invited by Commun. Theor. Phy
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