Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fine-Grained Urban Flow Inference   The ubiquitous deployment of monitoring devices in urban flow monitoring
systems induces a significant cost for maintenance and operation. A technique
is required to reduce the number of deployed devices, while preventing the
degeneration of data accuracy and granularity. In this paper, we present an
approach for inferring the real-time and fine-grained crowd flows throughout a
city based on coarse-grained observations. This task exhibits two challenges:
the spatial correlations between coarse- and fine-grained urban flows, and the
complexities of external impacts. To tackle these issues, we develop a model
entitled UrbanFM which consists of two major parts: 1) an inference network to
generate fine-grained flow distributions from coarse-grained inputs that uses a
feature extraction module and a novel distributional upsampling module; 2) a
general fusion subnet to further boost the performance by considering the
influence of different external factors. This structure provides outstanding
effectiveness and efficiency for small scale upsampling. However, the
single-pass upsampling used by UrbanFM is insufficient at higher upscaling
rates. Therefore, we further present UrbanPy, a cascading model for progressive
inference of fine-grained urban flows by decomposing the original tasks into
multiple subtasks. Compared to UrbanFM, such an enhanced structure demonstrates
favorable performance for larger-scale inference tasks.

29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys