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On moving from statistics to machine learning, the final stage of grief (2019)
I’ve spent the last few months preparing for and applying for data science jobs. It’s possible the data science world may reject me and my lack of both experience and a credential above…
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Surviving Django, if you care about databases
Django is currently the most commonly used full-stack web framework for Python. It has been around for a good 15 years, emerging as a winner from a period in which Python was already mature, but its web development tools were comparatively much more immature and fragmented.
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Using Bloom filters to efficiently synchronise hash graphs
This blog post uses MathJax to render mathematics. You need JavaScript enabled for MathJax to work.
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Event Sourcing (2017)
I recently became intrigued by the concept of event sourcing as applied to back-end architecture, specifically a microservice-oriented approach. I have spent the last few years working predominantly on the front-end, and became enamored by the simplicity and elegance of this pattern as the backbone of front-end…
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Are CRDTs suitable for shared editing?
The sole purpose of this blog is to host a single article..
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Introduction to Hacking PostgreSQL (2007)
Gavin Sherry and I have presented several versions of a tutorial introduction on how to modify the PostgreSQL source code. The original version was given at the PostgreSQL Anniversary Summit in June of 2006. Gavin has since given a revised version of the talk (at LCA 2007), as have I (at PgCon 2007).
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Parsing the Infamous Japanese Postal CSV
Late last year I released posuto, a package presenting Japanese postal code data in an easy-to-use format. It's based on data released by Japan Post, which is infamous for being widely used but hard to parse.
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APFS changes in Big Sur: how Time Machine backs up to APFS
APFS adds 6 volume roles, including one which supports Time Machine backups. And per-file encryption is coming.
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Rust DataBase Connectivity (RDBC)
Software engineer specializing in query engines and distributed systems
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An Introduction to Conflict-Free Replicated Data Types
This is an interactive tutorial series about Conflict-Free Replicated Data Types, or CRDTs for short. Their purpose is to allow seamless replication of data on different nodes in a distributed system. Merging is by construction always possible, without any conflicts. This series assumes no knowledge about CRDTs, but…
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Migrating to CockroachDB
CockroachDB is a newSQL database, behaving much like a traditional database while providing consistent HA and scalability out of the box.
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A visual explanation for regularization of linear models
A deep dive into exactly how regularization works, using visualizations rather than (just) mathematics. This article also dispels some myths and answer some important questions about Lasso and Ridge regression.
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US Postal Service data suggests significant population decline in San Francisco
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Generalizing 'jq' and Traversal Systems using optics and standard monads
The Personal blog and musings of Chris Penner, a designer, developer and future opsimath.
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I Want Decentralized Version Control for Structured Data
How do I synchronize application data between devices and people? That's the question I was unable to answer when thinking about ideas for new applications I could develop. I wanted the synchronization to be
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SELECT wat FROM sql
Thanks to Nikhil Benesch, Justin Jaffray and several decades of "wouldn't it be nice if..." for contributions.
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Gradient Boosted Decision Trees
From zero to gradient boosted decision trees
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In Praise of ZFS on Linux's ZED 'ZFS Event Daemon'
You're probably reading this page because you've attempted to access some part of my blog (Wandering Thoughts) or CSpace , the wiki thing it's part of. Unfortunately you're using a browser version that my anti-crawler precautions consider suspicious, most often because it's too old (most often this applies to versions…
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Do NLP Beyond English
7000+ languages are spoken around the world but NLP research has mostly focused on English. This post outlines why you should work on languages other than English.
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Unofficial Guide to Datomic Internals (2014)
This post is a compilation of publicly available information, Datomic docs and google group answers about Datomic internals. Intention is to help others understand implementation model and use Datomic more efficiently.
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Fixing Google Map Transit Feed Mistakes in Taiwan
Probably one of the nerdier things I do in my free time is fix and report transit errors on Google Maps. Accurate transit directions and schedules are extremely important if we want more people to take transit more often, especially in scenarios where good transit options exist! I do these bug reports and the…
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Prepared statements and their surprising performance implications
Or: How To Increase Your Elixir/Postgres Performance 20x With One Weird Trick
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Null Values in SQL Queries
*If you’re the owner of this website and have questions, reach out to Bluehost. We’re happy to help.
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Finding unique items: hash vs. sort
A while back, I was trying to speed up some code which finds unique items in a collection. For example, transforming "AABBADCAB" => "ABDC" . There are two ways to do this efficiently - one is based on sorting, the other based on hashing. So, which is faster? I couldn't find the answer, so I ran some experiments and…
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Streaming: a skill gap?
It's not just for big data