Tracking the gradients using the Hessian: A new look at variance reducing stochastic methods

Our goal is to improve variance reducing stochastic methods through better control variates. We first propose a modification of SVRG which uses the Hessian to track gradients over time, rather than to recondition, increasing the correlation of the control variates and leading to faster theoretical convergence close to the optimum. We then propose accurate and computationally efficient approximations to the Hessian, both using a diagonal and a low-rank matrix. Finally, we demonstrate the effectiveness of our method on a wide range of problems.Comment: 17 pages, 2 figures, 1 tabl

Missteps and Next Steps in U.S.-Cuba Migration Policies

"Instability” is the focal point that drives nearly all debates on U.S.- Cuban migration. Senior U.S. officials watch for it - the U.S. Director of National Intelligence monitors Cuba closely for upheavals that may lead to a migration crisis - while Cuban officials, concerned that U.S actions will cause turmoil, accuse U.S. officials of violating migration accords to create instability on the island

Building Community Among Diversity: Legal Services for Impoverished Immigrants

Part I of this Essay introduces the Immigrants\u27 Legal Needs Study (ILNS), which provides most of the data for this Essay. Part II focuses on immigrants\u27 access to legal assistance. It analyzes the problems and needs of recently arrived poor immigrants-both immigrants share with longer established poor residents as well as special needs related to immigrants\u27 residency status. Part III addresses the present day demography of our urban communities, including the levels of new immigration. Parts IV and V detail the legal difficulties faced by poor immigrants, the ways they deal with these problems, and community responses to these needs. Parts VI and VII explain the legal status differences between immigrants and the ways these differences impact their access to legal assistance. Finally, Part VIII suggests a vision for community renewal

bwDIM – Data In Motion

bwDIM entwickelt Schnittstellen und implementiert Prozesse, welche einen effizienten Datenfluss zwischen bestehenden funktionell verschiedenen Ebenen, von Archivierung bis Publikation, ermöglichen. Der Ausbau der Plattform soll Wissenschaftlern dabei helfen, den langfristigen Erhalt und die gesicherte Zugänglichkeit von wissenschaftlichen Daten zu auf einfachem Weg erreichen

The Munich SuperLink project

In Munich, the planning and development of the longest superconducting supply cable in an urban distribution grid is currently underway as part of the SuperLink project. This article will briefly introduce the project and explain the background that led to this idea. In addition, the chances that HTS cables offer for electric grid planning and the conversion of urban energy distribution in the context of the energy transition will be discussed