Congruent matrix Updated 2025-07-16
Matrix similarity Updated 2025-07-16
Metric signature Updated 2025-07-16
Surely You're Joking, Mr. Feynman chapter O Americano, Outra Vez! Updated 2025-07-16
Surely You're Joking, Mr. Feynman chapter Alfred Nobel's Other Mistake Updated 2025-07-16
Key quote that names the chapter:
My friend Matt Sands was once going to write a book to be called Alfred Nobel's Other Mistake.
k-nearest neighbors algorithm Updated 2025-07-16
Training, validation, and test data sets Updated 2025-07-16
Training and inference Updated 2025-07-16
This is the first thing you have to know about supervised learning:Both of those already have hardware acceleration available as of the 2010s.
- training is when you learn model parameters from input. This literally means learning the best value we can for a bunch of number input numbers of the model. This can easily be on the hundreds of thousands.
- inference is when we take a trained model (i.e. with the parameters determined), and apply it to new inputs
TOP500 Updated 2025-07-16
Intel supercomputer market share Updated 2025-07-16
Intel supercomputer market share from 1993 to 2020
. Source. This graph is shocking, they just took over the entire market! Some good pre-Intel context at The Supermen: The Story of Seymour Cray by Charles J. Murray (1997), e.g. in those earlier days, custom architectures like Cray's and many others dominated. Super Nintendo game Updated 2025-07-16
Super Mario game Updated 2025-07-16
How to hardcode subtitle into a video with FFmpeg? Updated 2025-07-16
To change font size: stackoverflow.com/questions/21363334/how-to-add-font-size-in-subtitles-in-ffmpeg-video-filterThe default appears to be 24, so just multiply that by whatever seems like a reasonable factor.
ffmpeg -i input.mp4 -vf "subtitles=subtitle.srt:force_style='Fontsize=64'" output.mp4Note howver that .ass subtitle files can contain style information, which ffmpeg respects. Aegisub can produce and preview such styles, making .ass one of the best options.
Subtitle file format Updated 2025-07-16
Steve Jobs quote on saving lives with a faster boot Updated 2025-07-16
This idea also comes up in other sources of course.
Margin Call (2011) bridge scene
. Source. Steve Jobs customers don't know what they want quote Updated 2025-07-16
TODO clear attribution source:
Some people say, "Give the customers what they want." But that's not my approach. Our job is to figure out what they're going to want before they do. I think Henry Ford once said, "If I'd asked customers what they wanted, they would have told me, 'A faster horse!'" People don't know what they want until you show it to them. That's why I never rely on market research. Our task is to read things that are not yet on the page.
Steve Wozniak Updated 2025-07-16
Jobs and Wozniak's blue box Updated 2025-07-16
Some have actually been preserved: en.wikipedia.org/wiki/File:Blue_Box_in_museum.jpg
Induced pluripotent stem cell Updated 2025-07-16
Calculus of variations Updated 2025-07-16
Calculus of variations is the field that searches for maxima and minima of Functionals, rather than the more elementary case of functions from to .
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