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On the Suboptimality of Proximal Gradient Descent for $\ell^{0}$ Sparse Approximation.
Yingzhen Yang
Jiashi Feng
Nebojsa Jojic
Jianchao Yang
Thomas S. Huang
Published in:
CoRR (2017)
Keyphrases
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sparse approximation
linear combination
sparse coding
sparse representation
noise model
cost function
gaussian process
convex relaxation
objective function
loss function
small number
learning problems
marginal likelihood
regression model
noisy images