10,162 research outputs found
Examples of quasitoric manifolds as special unitary manifolds
This note shows that for each with only , there exists a
-dimensional specially omnioriented quasitoric manifold which
represents a nonzero element in . This provides the counterexamples
of Buchstaber--Panov--Ray conjecture.Comment: 10 pages, v3: final versio
Multi-View Active Learning in the Non-Realizable Case
The sample complexity of active learning under the realizability assumption
has been well-studied. The realizability assumption, however, rarely holds in
practice. In this paper, we theoretically characterize the sample complexity of
active learning in the non-realizable case under multi-view setting. We prove
that, with unbounded Tsybakov noise, the sample complexity of multi-view active
learning can be , contrasting to
single-view setting where the polynomial improvement is the best possible
achievement. We also prove that in general multi-view setting the sample
complexity of active learning with unbounded Tsybakov noise is
, where the order of is
independent of the parameter in Tsybakov noise, contrasting to previous
polynomial bounds where the order of is related to the parameter
in Tsybakov noise.Comment: 22 pages, 1 figur
The Chinese Export Bundles - Patterns, Puzzles and Possible Explanations
Chinas exports have become increasingly sophisticated. This has generated anxiety in developed countries as the competitive pressure may be increasingly felt outside labor-intensive industries. Using product-level data on exports from different cities within China, this paper investigates the contributing factors to the rising export sophistication. Somewhat surprisingly, neither processing trade nor foreign invested firms are found to play an important role in generating the increased overlap in the export structure between China and high-income countries. Instead, improvement in human capital and government policies in the form of tax-favored high-tech zones appear to be the key in the countrys evolving export structure. On the other hand, processing trade, foreign invested firms, and government-sponsored high-tech zones all have contributed significantly to raising the unit values of Chinas exports within a given product category.China, India, Export sophistication, Export structure, high-tech zones, Human Capital
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