Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The exponentially weighted average forecaster in geodesic spaces of
  non-positive curvature   This paper addresses the problem of prediction with expert advice for
outcomes in a geodesic space with non-positive curvature in the sense of
Alexandrov. Via geometric considerations, and in particular the notion of
barycenters, we extend to this setting the definition and analysis of the
classical exponentially weighted average forecaster. We also adapt the
principle of online to batch conversion to this setting. We shortly discuss the
application of these results in the context of aggregation and for the problem
of barycenter estimation.

33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
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The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: q-fin