7,445 research outputs found
A compactness result for Fano manifolds and K\"ahler Ricci flows
We obtain a compactness result for Fano manifolds and K\"ahler Ricci flows.
Comparing to the more general Riemannian versions by Anderson and Hamilton, in
this Fano case, the curvature assumption is much weaker and is preserved by the
K\"ahler Ricci flows. One assumption is the boundedness of the Ricci potential
and the other is the smallness of Perelman's entropy. As one application, we
obtain a new local regularity criteria and structure result for K\"ahler Ricci
flows. The proof is based on a H\"older estimate for the gradient of harmonic
functions, which may be of independent interest
Isoperimetric inequality under K\"ahler Ricci flow
Let ({\M}, g(t)) be a K\"ahler Ricci flow with positive first Chern class.
We prove a uniform isoperimetric inequality for all time. In the process we
also prove a Cheng-Yau type log gradient bound for positive harmonic functions
on ({\M}, g(t)), and a Poincar\'e inequality without assuming the Ricci
curvature is bounded from below.Comment: final version, to appear in Am. J. Mat
Person Transfer GAN to Bridge Domain Gap for Person Re-Identification
Although the performance of person Re-Identification (ReID) has been
significantly boosted, many challenging issues in real scenarios have not been
fully investigated, e.g., the complex scenes and lighting variations, viewpoint
and pose changes, and the large number of identities in a camera network. To
facilitate the research towards conquering those issues, this paper contributes
a new dataset called MSMT17 with many important features, e.g., 1) the raw
videos are taken by an 15-camera network deployed in both indoor and outdoor
scenes, 2) the videos cover a long period of time and present complex lighting
variations, and 3) it contains currently the largest number of annotated
identities, i.e., 4,101 identities and 126,441 bounding boxes. We also observe
that, domain gap commonly exists between datasets, which essentially causes
severe performance drop when training and testing on different datasets. This
results in that available training data cannot be effectively leveraged for new
testing domains. To relieve the expensive costs of annotating new training
samples, we propose a Person Transfer Generative Adversarial Network (PTGAN) to
bridge the domain gap. Comprehensive experiments show that the domain gap could
be substantially narrowed-down by the PTGAN.Comment: 10 pages, 9 figures; accepted in CVPR 201
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