Tag: optimization

Feed: R-bloggers. Author: Theory meets practice.... Abstract: Slides, R code and video lectures of our 2020 The Mathematics and Statistics of Infectious Disease Outbreaks summer course at Stockholm University are made available to a wider audience. This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. The markdown+Rknitr source code of this blog is available under a GNU General Public License (GPL v3) license from github. Introduction During the 2020 summer Tom Britton and I gave a course on The Mathematics and Statistics of Infectious Disease Outbreaks at the Department of Mathematics, Stockholm University, Sweden. Pre-requisites for the ... Read More

Feed: Planet PostgreSQL. Well, we've already discussed isolation and made a digression regarding the low-level data structure. And we've finally reached the most fascinating thing, that is, row versions (tuples).Tuple headerAs already mentioned, several versions of each row can be simultaneously available in the database. And we need to somehow distinguish one version from another one. To this end, each version is labeled with its effective "time" (xmin) and expiration "time" (xmax). Quotation marks denote that a special incrementing counter is used rather than the time itself. And this counter is the transaction identifier.(As usual, in reality this is more ... Read More

Feed: R-bloggers. Author: R Views. [This article was first published on R Views, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your content on R-bloggers? click here if you have a blog, or here if you don't. One hundred fifty-six new packages made it to CRAN in October. Here are my “Top 40” selections in eight categories: Computational Methods, Data, Epidemiology, Mathematics, Machine Learning, Statistics, Utilities, and Visualization. Computational Methods mcmcensemble v 2.0: Provides ensemble samplers for affine-invariant Monte Carlo Markov Chain algorithms which allow a faster convergence for ... Read More

Feed: AWS Compute Blog. Author: Ben Peven. This post is contributed by Nicola Venuti, Sr. HPC Solutions Architect. AWS ParallelCluster is an AWS-supported, open source cluster management tool that makes it easy to deploy and manage High Performance Computing (HPC) clusters on AWS. While AWS ParallelCluster includes many benefits for its users, it has not provided straightforward support for monitoring your workloads. In this post, I walk you through an add-on extension that you can use to help monitor your cloud resources with AWS ParallelCluster. Product overview AWS ParallelCluster offers many benefits that hide the complexity of the underlying platform ... Read More

Feed: Microsoft Azure Blog. Author: Gunjan Jain. Lower your deployment cost, while improving client performance with Server Message Block (SMB) Multichannel on premium tier. Today, we are announcing the preview of Azure Files SMB Multichannel on premium tier. SMB 3.0 introduced the SMB Multichannel technology in Windows Server 2012 and Windows 8 client. This feature allows SMB 3.x clients to establish multiple network connections to SMB 3.x servers for greater performance over multiple network adapters and over network adapter with Receive Side Scaling (RSS) enabled. With this preview release, Azure Files SMB clients can now take advantage of SMB Multichannel ... Read More

Feed: Neo4j Graph Database Platform. Author: Jocelyn Hoppa. Some product releases break new ground, others are more about sowing and reaping; incrementally realizing the benefits of previous innovations while preparing for further gains.Approximately one year ago, Neo4j released Neo4j 4.0 – a landmark development in graph technology – further extending the world’s leading graph database.4.0 was big on headlines, and rightly so. In many ways, it marked the emergence of the graph database into the mainstream of enterprise technology – a true multi-database, multi-use system, able to provide the assurances that enterprises demand on security and scalability, while (further) delighting ... Read More

Feed: AWS Public Sector Blog. Author: Dr. Deep Medhi. Many of the fundamental breakthroughs such as detecting gravitational waves, genetic editing, changing the course of the Ebola outbreak and tracking down the origin of mass (the Higgs boson discovery) were made possible not only due to the strong federal support for research but also via advancements in the underlying computing and information technologies. Today, there is an exponential increase in data volume from simulations, sensors, observatories, satellites, and large scientific instruments such as the Vera Rubin Observatory (few hundreds of petabytes), High Luminosity Large Hadron Collider (anticipated to enter the ... Read More

Feed: AWS Architecture Blog. This post was co-written with Brian Nutt, Senior Software Engineer and Kao Makino, Principal Performance Engineer, both at Snowflake. Transactional databases are a key component of any production system. Maintaining data integrity while rows are read and written at a massive scale is a major technical challenge for these types of databases. To ensure their stability, it’s necessary to test many different scenarios and configurations. Simulating as many of these as possible allows engineers to quickly catch defects and build resilience. But the Holy Grail is to accomplish this at scale and within a timeframe that ... Read More

Feed: Microsoft Azure Blog. Author: Mark Russinovich. “Microsoft’s global network connects over 60 Azure regions, over 220 Azure data centers, over 170 edge sites, and spans the globe with more than 165,000 miles of terrestrial and subsea fiber. The global network connects to the rest of the internet via peering at our strategically placed edge points of presence (PoPs) around the world. Every day, millions of people around the globe access Microsoft Azure, Office 365, Dynamics 365, Xbox, Bing and many other Microsoft cloud services. This translates to trillions of requests per day and terabytes of data transferred each second ... Read More

Feed: R-bloggers. Author: Economics and R - R posts. Here is one more post about Biontech/Pfizer’s vaccine trial. That is because my previous two posts (here and here) have so far ignored one interesting topic: How do Biontech/Pfizer statistically account for interim analyses? Studying this topic gives us also general insights into how adaptive trial designs with multiple success conditions can be properly evaluated. According to their study plan sufficient vaccine efficacy is established if one can infer that the efficacy is at least 30% with a type I error (wrongly declaring sufficient efficacy) of no more than 2.5%. While ... Read More