304 research outputs found
swTVM: Exploring the Automated Compilation for Deep Learning on Sunway Architecture
The flourish of deep learning frameworks and hardware platforms has been
demanding an efficient compiler that can shield the diversity in both software
and hardware in order to provide application portability. Among the exiting
deep learning compilers, TVM is well known for its efficiency in code
generation and optimization across diverse hardware devices. In the meanwhile,
the Sunway many-core processor renders itself as a competitive candidate for
its attractive computational power in both scientific and deep learning
applications. This paper combines the trends in these two directions.
Specifically, we propose swTVM that extends the original TVM to support
ahead-of-time compilation for architecture requiring cross-compilation such as
Sunway. In addition, we leverage the architecture features during the
compilation such as core group for massive parallelism, DMA for high bandwidth
memory transfer and local device memory for data locality, in order to generate
efficient code for deep learning application on Sunway. The experimental
results show the ability of swTVM to automatically generate code for various
deep neural network models on Sunway. The performance of automatically
generated code for AlexNet and VGG-19 by swTVM achieves 6.71x and 2.45x speedup
on average than hand-optimized OpenACC implementations on convolution and fully
connected layers respectively. This work is the first attempt from the compiler
perspective to bridge the gap of deep learning and high performance
architecture particularly with productivity and efficiency in mind. We would
like to open source the implementation so that more people can embrace the
power of deep learning compiler and Sunway many-core processor
Dynamics of the Geometric Phase in Inhomogeneous Quantum Spin Chains
The dynamics of the geometric phase are studied in inhomogeneous quantum spin
chains after a quench. Analytic expressions of the Pancharatnam geometric phase
(PGP) are derived, for both the period-two quantum Ising chain
(QIC) and the disordered QIC. In the period-two QIC, due to the periodic
modulation, the PGP changes with time at the boundary of the Brillouin zone,
and consequently, the winding number
based on
the PGP is not quantized and thus not topological anymore. Nevertheless, the
PGP and its winding number show non-analytic singularities at the critical
times of the dynamical quantum phase transitions (DQPTs). This relation between
the PGP and the DQPT is further confirmed in the disordered QIC, where the
winding number is not defined. It is found that the critical time of DQPT
inherited from the homogeneous system and the additional one induced by the
weak disorder are also accompanied by the non-analytic singularity of the PGP,
by decomposing the PGP into each quasiparticle mode. The connection between the
non-analytic behavior of the PGP at the critical time and the DQPT, regardless
of whether the winding number is topological, can be explained by the fact that
they both arise when the Loschmidt amplitude vanishes.Comment: 14 pages, 8 figure
MicroRNA-128b mediates lipopolysaccharide-induced apoptosis via reactive oxygen species in human pulmonary microvascular endothelial cells
Objectives: This study aimed to explore the effects of miR-128b in the regulation of Lipopolysaccharide (LPS) induced apoptosis.
Methods: Human Pulmonary Microvascular Endothelial Cells (HPMECs) were transfected with an miR-128b inhibitor and stimulated with LPS for 24 h. FCM was performed to detect apoptosis and Reactive Oxygen Species (ROS) production. In addition, miRNA and caspase-3 expression levels were determined using real-time quantitative polymerase chain reaction and western blotting.
Results: LPS significantly induced apoptosis and ROS production and upregulated miR-128b and caspase-3 expressions in HPMECs. However, LPS-induced effects were suppressed when an miR-128b inhibitor was used. Preincubation with NAC decreased the LPS-induced apoptosis of HPMECs.
Conclusions: These effects were mediated by miR-128b via the caspase-3 pathway
Nonuniform-spaced Critical Behavior of Dynamical Quantum Phase Transitions in Multi-band Bloch Hamiltonian
We investigate the dynamical quantum phase transition (DQPT) in the
multi-band Bloch Hamiltonian of the one-dimensional periodic Kitaev model after
a quench from a Bloch band. Our study goes beyond the limitations of previous
works that primarily focused on two-band models and reveals significant
differences in DQPT between the two-band and multi-band systems. Our results
show that only the quench from the Bloch states, which causes the band gap to
collapse at the critical point, induces the DQPT after crossing the quantum
phase transition; otherwise, the DQPT will not occur. Additionally, the
critical times of the DQPT are not evenly spaced due to the deviation in the
critical momentum caused by the non-analytic singularities of the Pancharatnam
geometric phase. Our findings provide a better understanding of the
characteristics of non-equilibrium systems surrounding DQPTs.Comment: 9 pages, 10 figure
Dynamical relaxation behavior of extended XY chain with gapless phase following a quantum quench
We investigate the dynamical relaxation behavior of the two-point correlation
in extended XY models with a gapless phase after quenches from various initial
states. Specifically, we study the XY chain with gapless phase induced by the
additional interactions: Dzyaloshinskii-Moriya interaction and XZY-YZX type of
three-site interaction. When quenching from the gapped phase, we observe that
the additional interactions have no effect on the relaxation behavior. The
relaxation behavior is and for
the quench to the commensurate phase and the incommensurate phase,
respectively. However, when quenching from the gapless phase, we demonstrate
that the scaling behavior of is changed to for
the quench to the commensurate phase, and the decay of
follows or for the quench to the incommensurate
phase depending on the parameters of pre-quench Hamiltonian. We also establish
the dynamical phase diagrams based on the dynamical relaxation behavior of
in the extended XY models.Comment: 12 pages, 10 figure
Efficient Climate Simulation via Machine Learning Method
Hybrid modeling combining data-driven techniques and numerical methods is an
emerging and promising research direction for efficient climate simulation.
However, previous works lack practical platforms, making developing hybrid
modeling a challenging programming problem. Furthermore, the lack of standard
data sets and evaluation metrics may hamper researchers from comprehensively
comparing various algorithms under a uniform condition. To address these
problems, we propose a framework called NeuroClim for hybrid modeling under the
real-world scenario, a basic setting to simulate the real climate that we live
in. NeuroClim consists of three parts: (1) Platform. We develop a user-friendly
platform NeuroGCM for efficiently developing hybrid modeling in climate
simulation. (2) Dataset. We provide an open-source dataset for data-driven
methods in hybrid modeling. We investigate the characteristics of the data,
i.e., heterogeneity and stiffness, which reveals the difficulty of regressing
climate simulation data; (3) Metrics. We propose a methodology for
quantitatively evaluating hybrid modeling, including the approximation ability
of machine learning models and the stability during simulation. We believe that
NeuroClim allows researchers to work without high level of climate-related
expertise and focus only on machine learning algorithm design, which will
accelerate hybrid modeling research in the AI-Climate intersection. The codes
and data are released at https://github.com/x-w19/NeuroClim.Comment: Work in progres
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