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• W3125522460 abstract "Phase retrieval can be expressed as one non-convex constrained optimization problem to identify one phase minimizer in the primal space. Many iterative transform techniques have been proposed to identify the minimizer, e.g., relaxed averaged alternating reflections(RAAR) algorithms. RAAR algorithm is one alternating direction method of multipliers(ADMM) with one penalty parameter. Pairing with multipliers (dual vectors), phase vectors are lifted to higher dimensional vectors, RAAR algorithms actually is one continuation algorithm, which searches for local Nash equilibria in a primal-dual space. The dual iteration approximates one gradient ascent flow, which drives the corresponding local minimizers in a positive-definite Hessian region. The penalty parameter, which is the reciprocal of the RAAR parameter, plays a role of altering the size of the attractor basin for each stationary point. Under proper penalty parameters, the RAAR avoids the stagnation of these corresponding local minimizers in the primal space and thus screens out many stationary points corresponding to non-local minimizers." @default.
• W3125522460 created "2021-02-01" @default.
• W3125522460 creator A5066475581 @default.
• W3125522460 date "2021-01-27" @default.
• W3125522460 modified "2023-09-27" @default.
• W3125522460 title "Local saddle structure in relaxed averaged alternating reflections Algorithms on phase retrieval" @default.
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