5,288 research outputs found
Cheaper and Better: Selecting Good Workers for Crowdsourcing
Crowdsourcing provides a popular paradigm for data collection at scale. We
study the problem of selecting subsets of workers from a given worker pool to
maximize the accuracy under a budget constraint. One natural question is
whether we should hire as many workers as the budget allows, or restrict on a
small number of top-quality workers. By theoretically analyzing the error rate
of a typical setting in crowdsourcing, we frame the worker selection problem
into a combinatorial optimization problem and propose an algorithm to solve it
efficiently. Empirical results on both simulated and real-world datasets show
that our algorithm is able to select a small number of high-quality workers,
and performs as good as, sometimes even better than, the much larger crowds as
the budget allows
Accelerating AdS black holes as the holographic heat engines in a benchmarking scheme
We investigate the properties of holographic heat engines with an uncharged
accelerating non-rotating AdS black hole as the working substance in a
benchmarking scheme. We find that the efficiencies of the black hole heat
engines can be influenced by both the size of the benchmark circular cycle and
the cosmic string tension as a thermodynamic variable. In general, the
efficiency can be increased by enlarging the cycle, but is still constrained by
a universal bound as expected. A cross-comparison of the
efficiencies of the accelerating black hole heat engines and Schwarzschild-AdS
black hole heat engines suggests that the acceleration also increases the
efficiency although the amount of increase is not remarkable.Comment: 13 pages,4 figure
- …