2,747 research outputs found
No DNN Left Behind: Improving Inference in the Cloud with Multi-Tenancy
With the rise of machine learning, inference on deep neural networks (DNNs) has become a core building block on the critical path for many cloud applications. Applications today rely on isolated ad-hoc deployments that force users to compromise on consistent latency, elasticity, or cost-efficiency, depending on workload characteristics. We propose to elevate DNN inference to be a first class cloud primitive provided by a shared multi-tenant system, akin to cloud storage, and cloud databases. A shared system enables cost-efficient operation with consistent performance across the full spectrum of workloads. We argue that DNN inference is an ideal candidate for a multi-tenant system because of its narrow and well-defined interface and predictable resource requirements
Non equilibrium statistical physics with fictitious time
Problems in non equilibrium statistical physics are characterized by the
absence of a fluctuation dissipation theorem. The usual analytic route for
treating these vast class of problems is to use response fields in addition to
the real fields that are pertinent to a given problem. This line of argument
was introduced by Martin, Siggia and Rose. We show that instead of using the
response field, one can, following the stochastic quantization of Parisi and
Wu, introduce a fictitious time. In this extra dimension a fluctuation
dissipation theorem is built in and provides a different outlook to problems in
non equilibrium statistical physics.Comment: 4 page
Double-layer shocks in a magnetized quantum plasma
The formation of small but finite amplitude electrostatic shocks in the
propagation of quantum ion-acoustic waves (QIAWs) obliquely to an external
magnetic field is reported in a quantum electron-positron-ion (e-p-i) plasma.
Such shocks are seen to have double-layer (DL) structures composed of the
compressive and accompanying rarefactive slow-wave fronts. Existence of such DL
shocks depends critically on the quantum coupling parameter associated with
the Bohm potential and the positron to electron density ratio . The
profiles may, however, steepen initially and reach a steady state with a number
of solitary waves in front of the shocks. Such novel DL shocks could be a good
candidate for particle acceleration in intense laser-solid density plasma
interaction experiments as well as in compact astrophysical objects, e.g.,
magnetized white dwarfs.Comment: 4 pages, 1 figure (to appear in Physical Review E
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Physical interpretation of the correlation between multi-angle spectral data and canopy height
Recent empirical studies have shown that multi-angle spectral data can be useful for predicting canopy height, but the physical reason for this correlation was not understood. We follow the concept of canopy spectral invariants, specifically escape probability, to gain insight into the observed correlation. Airborne Multi-Angle Imaging Spectrometer (AirMISR) and airborne Laser Vegetation Imaging Sensor (LVIS) data acquired during a NASA Terrestrial Ecology Program aircraft campaign underlie our analysis. Two multivariate linear regression models were developed to estimate LVIS height measures from 28 AirMISR multi-angle spectral reflectances and from the spectrally invariant escape probability at 7 AirMISR view angles. Both models achieved nearly the same accuracy, suggesting that canopy spectral invariant theory can explain the observed correlation. We hypothesize that the escape probability is sensitive to the aspect ratio (crown diameter to crown height). The multi-angle spectral data alone therefore may not provide enough information to retrieve canopy height globally
Gauge Symmetries on -Deformed Spaces
A Hamiltonian formulation of gauge symmetries on noncommutative (
deformed) spaces is discussed. Both cases- star deformed gauge transformation
with normal coproduct and undeformed gauge transformation with twisted
coproduct- are considered. While the structure of the gauge generator is
identical in either case, there is a difference in the computation of the
graded Poisson brackets that yield the gauge transformations. Our analysis
provides a novel interpretation of the twisted coproduct for gauge
transformations.Comment: LaTex, 20 pages, no figure
Ultrasensitive Displacement Noise Measurement of Carbon Nanotube Mechanical Resonators
Mechanical resonators based on a single carbon nanotube are exceptional
sensors of mass and force. The force sensitivity in these ultra-light
resonators is often limited by the noise in the detection of the vibrations.
Here, we report on an ultra-sensitive scheme based on a RLC resonator and a
low-temperature amplifier to detect nanotube vibrations. We also show a new
fabrication process of electromechanical nanotube resonators to reduce the
separation between the suspended nanotube and the gate electrode down to ~nm. These advances in detection and fabrication allow us to reach
displacement sensitivity. Thermal
vibrations cooled cryogenically at 300~mK are detected with a signal-to-noise
ratio as high as 17~dB. We demonstrate
force sensitivity, which is the best force sensitivity achieved thus far with a
mechanical resonator. Our work is an important step towards imaging individual
nuclear spins and studying the coupling between mechanical vibrations and
electrons in different quantum electron transport regimes.Comment: 9 pages, 5 figure
Inelastic scattering of protons from He and Li in a folding model approach
The proton-inelastic scattering from He and Li nuclei are
studied in a folding model approach. A finite-range, momentum, density and
isospin dependent nucleon-nucleon interaction (SBM) is folded with realistic
density distributions of the above nuclei. The renormalization factors N
and N on the real and volume imaginary part of the folded potentials are
obtained by analyzing the respective elastic scattering data and kept unaltered
for the inelastic analysis at the same energy. The form factors are generated
by taking derivatives of the folded potentials and therefore required
renormalizations. The values are extracted by fitting the p +
He,Li inelastic angular distributions. The present analysis of
p + He inelastic scattering to the 3.57 MeV excited state, including
unpublished forward angle data (RIKEN) confirms L = 2 transition. Similar
analysis of the p + He inelastic scattering angular distribution leading to
the 1.8 MeV (L = 2) excited state fails to satisfactorily reproduce the data.Comment: one LaTeX file, five PostScript figure
Microstructure/phase evolution in mechanical alloying/milling of stainless steel and aluminum powder blends
The present study aims to examine the phase evolution in blends comprising different proportions of stainless steel (316SS) and Al (0, 25, 65, and 85 wt pct) powders during high-energy ball milling through X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and high-resolution transmission electron microscopy (HRTEM). An attempt has also been made to study the hardness value of the bulk samples obtained by hot pressing the ball-milled powder blend at suitable temperature and pressure. The results on changes in the constituent phases and hardness value of the bulk samples obtained after consolidation of ball-milled alloy using the high-pressure technique have been reported
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