7,609 research outputs found
Template-Instance Loss for Offline Handwritten Chinese Character Recognition
The long-standing challenges for offline handwritten Chinese character
recognition (HCCR) are twofold: Chinese characters can be very diverse and
complicated while similarly looking, and cursive handwriting (due to increased
writing speed and infrequent pen lifting) makes strokes and even characters
connected together in a flowing manner. In this paper, we propose the template
and instance loss functions for the relevant machine learning tasks in offline
handwritten Chinese character recognition. First, the character template is
designed to deal with the intrinsic similarities among Chinese characters.
Second, the instance loss can reduce category variance according to
classification difficulty, giving a large penalty to the outlier instance of
handwritten Chinese character. Trained with the new loss functions using our
deep network architecture HCCR14Layer model consisting of simple layers, our
extensive experiments show that it yields state-of-the-art performance and
beyond for offline HCCR.Comment: Accepted by ICDAR 201
Ground state baryons in the flux-tube three-body confinement model using Diffusion Monte Carlo
We make a systematical diffusion Monte Carlo (DMC) calculation for all ground
state baryons in two confinement scenarios, the pairwise confinement and the
three-body flux-tube confinement. With the baryons as an example, we illustrate
a feasible procedure to investigate the few-quark states with possible few-body
confinement mechanisms, which can be extended to the multiquark states easily.
For each baryon, we extract the mass, mean-square radius, charge radius, and
the quark distributions. We use the Jackknife resampling method to estimate the
statistical uncertainties of masses to be less than 1 MeV. To determine the
baryon charge radii, we include the constituent quark size effect, which is
fixed by the experimental and lattice QCD results. Our results show that both
two-body and three-body confinement mechanisms can give a good description of
the experimental data if the parameters are chosen properly. In the flux-tube
confinement, introducing different tension parameters for the baryons and
mesons are necessary, specifically, . The
lesson from the calculation of the nucleon mass with the DMC method is that the
improper pre-assignment of the channels may prevent us from obtaining the real
ground state. With this experience, we obtain the real ground state (the
threshold with the di-meson configuration) of the
system with starting from the
diquark-antidiquark spin-color channels alone, which is hard to achieve in the
variational method and was not obtained in the previous DMC calculations.Comment: 24 pages, 18 figures. The Supplement material is attached in the
source code of LaTeX. Comments are welcome
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