2,884 research outputs found
SCOPE: Scalable Composite Optimization for Learning on Spark
Many machine learning models, such as logistic regression~(LR) and support
vector machine~(SVM), can be formulated as composite optimization problems.
Recently, many distributed stochastic optimization~(DSO) methods have been
proposed to solve the large-scale composite optimization problems, which have
shown better performance than traditional batch methods. However, most of these
DSO methods are not scalable enough. In this paper, we propose a novel DSO
method, called \underline{s}calable \underline{c}omposite
\underline{op}timization for l\underline{e}arning~({SCOPE}), and implement it
on the fault-tolerant distributed platform \mbox{Spark}. SCOPE is both
computation-efficient and communication-efficient. Theoretical analysis shows
that SCOPE is convergent with linear convergence rate when the objective
function is convex. Furthermore, empirical results on real datasets show that
SCOPE can outperform other state-of-the-art distributed learning methods on
Spark, including both batch learning methods and DSO methods
Medial patellofemoral ligament reconstruction using a bone groove and a suture anchor at patellar: a safe and firm fixation technique and 3-year follow-up study
Resonances from reactions with the center of mass energy from 1550 to 1676 MeV
For the study of the resonances, we analyze the differential cross
sections and polarizations for the reactions
and with an effective Lagrangian approach. Data of an
early experiment and the recent Crystal Ball experiment at BNL are included in
the analysis with the c.m. energy from 1550 to 1676 MeV. Our results clearly
support the existence of a resonance with , mass
near 1633 MeV, and width about 120 MeV, which confirms the 3-star in PDG. Meanwhile, our results do not support the existence of the
2-star in PDG. The analysis results for the
parameters of the relevant resonances and couplings are presented.Comment: version accepted by Phys. Rev.
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