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On Accelerated Gradient Approximation for Least Square Regression with L1-Regularization.
Yongquan Zhang
Jianyong Sun
Published in:
SSCI (2015)
Keyphrases
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error bounds
sparse approximation
approximation error
conjugate gradient algorithm
approximation algorithms
piecewise constant
relative error
image processing
multiscale
np hard
linear combination
image reconstruction
prior information
gradient information
gradient direction