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**Anderson accelerated Douglas-Rachford splitting.**
*(English)*
Zbl 1458.90511

Summary: We consider the problem of nonsmooth convex optimization with linear equality constraints, where the objective function is only accessible through its proximal operator. This problem arises in many different fields such as statistical learning, computational imaging, telecommunications, and optimal control. To solve it, we propose an Anderson accelerated Douglas-Rachford splitting (A2DR) algorithm, which we show either globally converges or provides a certificate of infeasibility/unboundedness under very mild conditions. Applied to a block separable objective, A2DR partially decouples so that its steps may be carried out in parallel, yielding an algorithm that is fast and scalable to multiple processors. We describe an open-source implementation and demonstrate its performance on a wide range of examples.

### MSC:

90C25 | Convex programming |

90C53 | Methods of quasi-Newton type |

49J52 | Nonsmooth analysis |

65K05 | Numerical mathematical programming methods |

68W10 | Parallel algorithms in computer science |

68W15 | Distributed algorithms |

97N80 | Mathematical software, computer programs (educational aspects) |

### Keywords:

Anderson acceleration; nonsmooth convex optimization; parallel and distributed optimization; proximal oracles; stabilization; global convergence; pathological settings
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\textit{A. Fu} et al., SIAM J. Sci. Comput. 42, No. 6, A3560--A3583 (2020; Zbl 1458.90511)

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