PhasePack: A Phase Retrieval Library

TL;DR

PhasePack is a comprehensive software library that standardizes and benchmarks various phase retrieval algorithms, enabling easier comparison and improved performance through optimized implementations.

Contribution

It provides a unified interface and testbed for phase retrieval algorithms, facilitating benchmarking and comparison with enhanced, faster, and more robust implementations.

Findings

Enables benchmarking of multiple phase retrieval methods

Uses adaptive stepsizes and fast eigensolvers for improved speed

Provides a common platform for algorithm comparison

Abstract

Phase retrieval deals with the estimation of complex-valued signals solely from the magnitudes of linear measurements. While there has been a recent explosion in the development of phase retrieval algorithms, the lack of a common interface has made it difficult to compare new methods against the state-of-the-art. The purpose of PhasePack is to create a common software interface for a wide range of phase retrieval algorithms and to provide a common testbed using both synthetic data and empirical imaging datasets. PhasePack is able to benchmark a large number of recent phase retrieval methods against one another to generate comparisons using a range of different performance metrics. The software package handles single method testing as well as multiple method comparisons. The algorithm implementations in PhasePack differ slightly from their original descriptions in the literature in order to achieve faster speed and improved robustness. In particular, PhasePack uses adaptive stepsizes, line-search methods, and fast eigensolvers to speed up and automate convergence.