A matrix expander Chernoff bound
A matrix expander Chernoff bound
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矩阵展开器切尔诺夫界
DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
N. Srivastava
中科院分区:
文献类型:
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作者:
A. Garg;Y. Lee;Zhao Song;N. Srivastava
We prove a Chernoff-type bound for sums of matrix-valued random variables sampled via a random walk on an expander, confirming a conjecture due to [Wigderson and Xiao 06]. Our proof is based on a new multi-matrix extension of the Golden-Thompson inequality which improves upon the inequality in [Sutter, Berta and Tomamichel 17], as well as an adaptation of an argument for the scalar case due to [Healy 08]. Our new multi-matrix Golden-Thompson inequality could be of independent interest. Secondarily, we also provide a generic reduction showing that any concentration inequality for vector-valued martingales implies a concentration inequality for the corresponding expander walk, with a weakening of parameters proportional to the squared mixing time.
DOI:
10.1007/s00023-017-0569-y
发表时间:
2017
期刊:
Annales Henri Poincaré
影响因子:
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作者:
Fumio Hiai;Robert König;Marco Tomamichel
通讯作者:
Marco Tomamichel