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Capri Granville's Blog – September 2019 Archive (7)

Artificial Neural Networks in a Nutshell

According to Wikipedia, an ANN is based on a collection of connected units or nodes called artificial neurons, which loosely model the neurons in a biological brain. Each connection, like the synapses in a biological brain, can transmit a signal to other neurons. An artificial neuron that receives a signal then processes it and can signal neurons connected to it.

In ANN implementations, the "signal" at a connection is a real number, and the output of each neuron is computed by some…


Added by Capri Granville on September 23, 2019 at 4:30am — No Comments

Stylometric Feature Engineering Techniques in Authorship Analysis

Technical paper, published in IEEE Xplore.


Authorship analysis (AA) is the study of unveiling the hidden properties of authors from textual data. It extracts an author's identity and sociolinguistic characteristics based on the reflected writing styles in the text. The process is essential for various areas,…

Added by Capri Granville on September 22, 2019 at 1:30pm — No Comments

AI Trading the Market

Written by Jun Wu.

Every year since I worked on wall street, traditional trading-is-an-art-form traders are leaving and retiring.

Their jobs are replaced by a new breed of experts who are savvy with numbers, systems, and the market. These experts don’t sleep, eat or drink. They are the AI Systems that can run on a thousand machines to…


Added by Capri Granville on September 22, 2019 at 1:30pm — No Comments

The problem that Google Solved with Quantum Supremacy

The problem has to do with sampling, random numbers and probability distributions, so it is of interest to our community. As Scott Aaronson describes it in his blog, here is the problem:

You can read more here, including answers to…


Added by Capri Granville on September 22, 2019 at 1:30pm — No Comments

The Math of Machine Learning - Berkeley University Textbook

This document is an attempt to provide a summary of the mathematical background needed for an introductory class in machine learning, which at UC Berkeley is known as CS 189/289A.

Our assumption is that the reader is already familiar with the basic concepts of multivariable calculus and linear algebra (at the level of UCB Math 53/54). We emphasize that this document is not a replacement for the prerequisite classes. Most subjects presented here are covered rather minimally; we intend…


Added by Capri Granville on September 22, 2019 at 11:30am — No Comments

What are the Typical Data Scientist Profiles on LinkedIn? Survey Results

The charts below represents the main findings of some recent analysis of 1,000 data scientist LinkedIn profiles, using a web scraper. It was limited to Singapore, and for people having "data scientist" on their profile. Of course, many have a different job title especially in fields such as Fintech (quant engineer) or Healthcare (biostatistician) but the findings are interesting nevertherless and seem to apply to other locales as well.

The first chart features the educational…


Added by Capri Granville on September 12, 2019 at 10:00am — 1 Comment

R Users’ Salaries from the 2019 Stackoverflow Survey

Interesting analysis done in R, about salaries of R developers broken down by country, featuring salary range and median salary. 

The dataset consists of survey answers from nearly 90,000 respondents. About 5,000 of them reported using R for “extensive development work over the past year”. The first filter used reduces the dataset from 88,883 respondents to 5,048. The second filter…


Added by Capri Granville on September 5, 2019 at 7:00am — No Comments


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