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Is the Kalman filter a low-pass filter? Sometimes!
Quick notes: No, These Are Systems isn’t going to be just “the Kalman Filter Blog”. Yes, I plan to continue the inflation series. Yes, I am still planning to write an introductory series about control theory more broadly. There’s a lot of material to get through! As always, I welcome your feedback.
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History and effective use of Vim
History and effective use of Vim
July 19, 2019
Newsletter ↳
This article is based on historical research and on simply reading the Vim user manual cover to cover. Hopefully these notes will help you (re?)discover core functionality of the editor, so you can abandon pre-packaged vimrc files and use p...
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Fake Dog for Home Security
Fake Dog for Home Security
Fake dog barking for home security while on vacation.
Mon 27 June 2022I set up a fake dog that barks if my surveillance cameras are triggered while I'm out of town on vacation. It's a pair of computer speakers plugged into a Raspberry Pi, which is an inexpensive single-boa...
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Practical Deep Learning for Coders 2022 – fast.ai
A new edition
Today we’re releasing Practical Deep Learning for Coders 2022—a complete from-scratch rewrite of fast.ai’s most popular course, that’s been two years in the making. Previous fast.ai courses have been studied by hundreds of thousands of students, from all walks of life, from all parts o...
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How to advertise to developers: deep dive into paid developer marketing
Contents
How to advertise to developers: deep dive into paid developer marketing
Advertising to developers feels like asking for trouble. And it is.
Most developers hate advertising, especially if it is done in a "traditional" way. Pushy pop-ups, "do it now", flashy colors, and all that stuff.
Thing...
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The “Spreadsheet Mentality” sucks, and kills the efficacy of jobs
Member-only story
The “Spreadsheet Mentality” sucks, and kills the efficacy of jobs
I write about topics related to organizational change a lot. Just a few days back, I wrote about the intersection point of productivity, organizational alignment, and self-awareness. (Many companies and individuals s...
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How Did REST Come To Mean The Opposite of REST?
I am getting frustrated by the number of people calling any HTTP-based interface a REST API. Today’s example is the SocialSite REST API. That is RPC. It screams RPC. There is so much coupling on display that it should be given an X rating.
What needs to be done to make the REST architectural style c...
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A Practical Guide To Machine Learning
A Practical Guide To Machine Learning
It focuses on teaching you how to code basic machine learning models. In addition to linear regression, logistic regression, support vector machines, and decision trees, the content is designed for beginners with general knowledge of machine learning. In this co...
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Everyday Data Science
In this interactive course, you’ll participate in my life stories, and learn data science tricks for optimizing your day-to-day life. You’ll make the perfect glass of lemonade using Thompson sampling. You’ll lose weight with differential equations. And you might just qualify for the Olympics with a ...
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TBM 30/52: Why Don’t We Have a Strategy?
The problem isn't that people can't think strategically.
The problem is that there are disincentives to thinking strategically.
Strategy requires discourse, collaboration, contemplation, and critical thinking. It takes time and space. Sadly, time to think—alone and together—is in short supply in mos...
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Self-hosting on localhost
Self-hosting on localhost
As a software engineer with a bit of job-induced paranoia, I love the idea of escaping the claws of big tech via self-hosting. In recent years, a plethora of amazing free and open source projects have emerged, providing alternatives to everything from Dropbox and iTunes to ...
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rsync: Series Overview
For many years, I was only a casual user of rsync and used it mostly for one-off file transfers.
Over time, I found rsync useful in more and more cases, and would recommend every computer user put this great tool into their toolbox 🛠 🧰 !
I’m publishing a series of blog posts about rsync:
- rsync, ar...
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The really important job interview questions engineers should ask (but don't)
The really important job interview questions engineers should ask (but don't)
Jun 22, 2022
Since we started PostHog, our team has interviewed 725 people.
What's one thing I've taken from this?
It's normal for candidates not to ask harder questions about our company, so they usually miss out on a cha...
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Hard things in Computer Science
If you’ve more than a couple of years of experience in IT, you probably have stumbled upon the following quote:
There are only two hard things in computer science: cache invalidation and naming things.
Then, because it’s such a great quote, it evolved:
There are two hard things in computer science: ...
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Relational Databases Explained
Relational Databases Explained
How Relational Databases Work. This post talks about how indexes and transactions work on the inside of relational databases.
It is often surprising how little is known about how databases operate at a surface level, considering they store almost all of the states in o...
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Mental Model: Difficult Problems vs. Hard Work
In “Difficult Problems and Hard Work”, David McIver writes:
An idiosyncratic distinction I find useful (though don’t reliably stick to) is that there is hard work and difficult problems, and these are not all that closely related. The distinction is roughly that something is hard work if you have to...
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How to Write Better Queries for Time-Series Data Analysis With Custom SQL Functions | TigerData
Products & Services
Support Services
Support options for your use case, infrastructure, and budget
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Open-Source Extensions and Tools
Time Series and Real-Time Analytics
A reliable PostgreSQL cloud for your workloads
AI and Vector
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Security, reliability, and support for deman...
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https://openai.com/index/techniques-for-training-large-neural-networks/
Techniques for training large neural networks
Large neural networks are at the core of many recent advances in AI, but training them is a difficult engineering and research challenge which requires orchestrating a cluster of GPUs to perform a single synchronized calculation.
Large neural networks ar...
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Raising exceptions or returning error objects in Python
The other day I got a question about some old code I had written which, instead of raising an exception for an error condition as the reader expected, returned an error object:
With your EmailVerifyTokenGenerator class, why do you return error classes instead of raising custom errors? You could stil...
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You need to know what right-half-plane zeros are
You need to know what right-half-plane zeros are
"I need to know about what now?!"
Right-half-plane zeros. Or at least, I want you to know about them, because there's a really critical one that's about to play out and could affect the well-being of a lot of people.
So what am I talking about exactly...
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