Tag: fun

Feed: R-bloggers. Author: Florian Privé. In this short post, I talk about why I’m moving away from using function apply. With matrices It’s okay to use apply with a dense matrix, although you can often use an equivalent that is faster. N M 8000 X matrix(rnorm(N * M), N) system.time(res1 apply(X, 2, mean)) ## user system elapsed ## 0.73 0.05 0.78 system.time(res2 colMeans(X)) ## user system elapsed ## 0.05 0.00 0.05 stopifnot(isTRUE(all.equal(res2, res1))) “Yeah, there are colSums and colMeans, but what about computing standard deviations?” There are lots of apply-like functions in package {matrixStats}. system.time(res3 apply(X, 2, sd)) ## user ... Read More

Feed: Google Cloud Platform Blog. Author: GCP Team. By Mete Atamel, Developer Advocate I use my Google Home all the time to check the weather before leaving home, set up alarms, listen to music, but I never considered writing an app for it. What does it take to write an app for the Google Home assistant? And can we make it smarter by leveraging Google Cloud? Those were the questions that my colleague Chris Bacon, and I were thinking about when we decided to build a demo for a conference talk. My initial instinct was that building an app for ... Read More

Feed: R-bloggers. Author: aghaynes. Just a little fun today… the R console isn’t the most interesting of things… text is typically either black or red (assuming default settings in RStudio). There’s a package though called crayon which allows one to change the style of text in terms of colour, background and some font-type settings. It could be an interesting way to spice up summaries (I’m not recommending it, but it’s a possibility. As far as packages are concerned, it’s just another dependency…)… devtools::install_github("r-lib/crayon") library(crayon) cat(green( 'I am a green line ' %+% blue$underline$bold('with a blue substring') %+% yellow$italic(' that becomes ... Read More

Feed: R-bloggers. Author: Bob Carpenter. Richard McElreath inquires: I was helping a colleague recently fix his MATLAB code by using log_sum_exp and log1m tricks. The natural question he had was, “where do you learn this stuff?” I checked Numerical Recipes, but the statistical parts are actually pretty thin (at least in my 1994 edition). Do you know of any books/papers that describe these techniques? I’d love to hear this blog’s answers to these questions. I replied that I learned numerical analysis “on the street” through HMM implementations. HMMs are also a good introduction to the kind of dynamic programming technique ... Read More

Feed: Featured Blog Posts - Data Science Central. Author: Matt Tucker. In 2018 Fast Company declared the Data Scientist the best job for the third year in a row, which I wholeheartedly agree with (besides the Director of Fun at the York National Railway Museum), however the role of data scientist, as we know it, will soon have the same fate as the bowling pinsetters, chariot racers, and human alarm clocks. In 2000-2010 data science was dominated by masters of herculean subjects, with PhDs in linear algebra and statistics, combined with expertise in the uncelebrated (at the time) field of ... Read More

Feed: R-bloggers. Author: business-science.io - Articles. One of the most difficult and most critical parts of implementing data science in business is quantifying the return-on-investment or ROI. As a data scientist in an organization, it’s of chief importance to show the value that your improvements bring. In this article, we highlight three reasons you need to learn the Expected Value Framework, a framework that connects the machine learning classification model to ROI. Further, we’ll point you to a new video we released on the Expected Value Framework: Modeling Employee Churn With H2O that was recently taught as part of our ... Read More

Feed: Planet MySQL; Author: Open Query; In MariaDB 10.2.12, these two don’t yet work together. GTID = Global Transaction ID.  In the master-slave asynchronous replication realm, this means that you can reconnect a slave to another server (change its master) and it’ll happily continue replicating from the correct point.  No more fussing with filenames and offsets (which of course will both differ on different machines). So in concept the GTIID is “globally” unique – that means it’s consistent across an entire infra: a binlogged write transaction will have the same GTID no matter on which machine you look at it ... Read More

Feed: All - O'Reilly Media. Author: Yevgeniy Brikman. Simplicity (source: Rodger Evans on Flickr) This is Chapter 3 from "Hello, Startup." Read the full book on O'Reilly's learning platform. As far as the customer is concerned, the interface is the product. [Raskin 2000, 5], Jeff Raskin, The Humane Interface For someone browsing the web, Google is a text box and a page of results, and not the bots that crawl the web, the algorithm to rank pages, or the hundreds of thousands of servers in multiple data centers around the world. For someone who needs a ride, Uber is a ... Read More

Feed: Blog – ArangoDB. Author: Daniel Larkin-York. Graph databases are often used to analyze relations within highly interconnected datasets. Social networks, recommendation engines, corporate hierarchies, fraud detection or querying a bill of materials are common use cases. But these datasets change over time and you as a developer or data scientist may want to time travel and analyze these changes. While ArangoDB may not come with built-in support for managing the revision history of graph data, we’ll show in this article how to manage it in a performant manner for some general classes of graphs. Best of all, this won’t ... Read More

Feed: Planet MySQL; Author: Valeriy Kravchuk; In my previous summary blog post I listed 5 problems I see with the way Oracle handles MySQL server development. The first of them was that "Oracle does not develop MySQL server in a true open source way" and this is actually what I started my draft of that entire blog post with. Now it's time to get into details, as so far there was mostly fun around this and statements that MariaDB also could do better in the related Twitter discussion I had.So, let me explain what forces me to think that Oracle ... Read More