Alexander Polyakov

@f_butz @arpit_bhayani What do you mean compiles? “It runs on dev machine in dynamically typed interpreted language, let’s go!”

@arpit_bhayani 590x more test code than actual code. meanwhile the average ai-generated app ships with “it compiled, let’s go.”

SQLite has about 155,800 lines of code, and its test suite has roughly 92 million lines. That is ~590x more test code than actual code 🤯 This is the level of testing you need for a real production database. Here are some types of tests they run. Out-of-memory tests - SQLite cannot just crash when memory runs out. On embedded devices, OOM errors are common. They simulate malloc failures at every possible point and verify that the database handles them gracefully. I/O error tests - Disks fail. Networks drop. Permissions change mid-operation. SQLite inserts a custom file system layer that can simulate failures after N operations, then verifies that no corruption occurs. Crash tests - What happens if power cuts out mid-write? They simulate crashes at random points during writes, corrupt the unsynchronized data to mimic real filesystem behavior, then verify the database either completed the transaction or rolled it back cleanly. No corruption allowed. Fuzz testing - They throw malformed SQL, corrupted database files, and random garbage at SQLite. The dbsqlfuzz tool runs about 500 million test mutations every day across 16 cores. 100% branch coverage - Every single branch instruction in SQLite's core is tested in both directions. Not just 'did this line run', but 'did this condition evaluate to both true AND false'. Databases are really unforgiving :) By the way, if you want to go deeper, I recommend reading the official SQLite documentation on their testing strategy. The doc is pretty practical and deep. Have linked it below.

@elonmusk this was awarded under Donald Trump and ended in 2022. Also this is not for conducting large scale deception but rather an R&D contract for SIMULATION TESTING & MEASUREMENT of large scale deception for NATIONAL DEFENSE. This is a contract awarded out of Wright-Patterson AFB (FA8620) in 2018 funded as part of Air Force Research Lab. This is for ACTIVE SOCIAL ENGINEERING DEFENSE (ASED), not for doing social engineering or large scale deception by Reuters. Furthermore this was a COMPETITIVE ACQUISITION in which there were 34 bidders, of which Reuters received award after following the appropriate competitive procedures required by the Federal Acquisition Regulations (FAR). The contract was awarded under Donald Trump and ended in 2022. This is either a totally bogus attempt at misleading the public into blaming acquisition professionals who did their job, or you actually have no clue what the data says that you’re using to make decisions highergov.com/contract/FA865…

I made a Wind Tunnel in Roblox to test the new Aerodynamics on meshpart airfoils. I wanted to see how accurate the Cl / AOA graph shape would look to real life wind tunnel data. What I saw was amazing, the graph shape represented real life almost exactly... #RobloxDev #Roblox

days 3-5: path, dodge and map #Inktober

@minisiegfried Hah, so this custom font is called "spider", and your second image is a spider, cool :) Yeah I was thinking that it reminds me of the gothic font found in the old German documents, but never knew that these capitals are called lombardic capitals.

@Nolokor not trying to tell anything :) “spider” is custom font and the quote from Ayreon’s “Dreamtime” (or “Awakening”) follows the early gothic hand with lombardic capitals used on the cover of their first album

late start but here it is days 1 and 2 of #inktober2023 dream and spider

@JedDevs @MaximumADHD @Quenty @grilme99 We've come a long way, baby! [My 2005 test place on the left, 2023 Winds of Fortune on the right]

Check this out!

Full F16 precision 34B Code Llama at >20 t/s on M2 Ultra

#RobloxDev Update: Creators can now make their experiences even more immersive through our new aerodynamics system. With a few simple adjustments, developers can unlock performant lifelike wind and air simulations with lift and drag forces. devforum.roblox.com/t/introducing-…

@eshear And it’s inconsistent in a thread view… Also it’s inconsistent when you scroll up or down.

I like this change to twitter…the translucent controls make more sense than the fully invisible. Solid design work.

Something I love about Oslo: This city is incredibly quiet. Lots of people are walking/biking/scooting. And most vehicles are electric, while speed limits are typically 30 km/hr (19 mph), so engine/tire noise is negligible. A reminder that cities aren't loud; *cars* are loud.

@Tinaynox Who is the artist? Looks super cool, looking forward to your release!

Second frame of the second cutscene💁‍♀️ #spacepressure3d #indiedev #IndieGameDev #indiegame #GameDevelopment #indie #comic #comics

So exciting to see so many new cool games being released on Roblox!

We just launched the Roblox Career Center, an immersive experience that gives candidates a firsthand look at our platform and our vision for bringing people together. Learn more: blog.roblox.com/2023/08/introd…

Using ChatGPT custom instructions to play RLHF Chatroulette, where all responses are in reply to a different prompt entirely:

National Lab (LBNL) results support LK-99 as a room-temperature ambient-pressure superconductor. Simulations published 1 hour ago on arxiv support LK-99 as the holy grail of modern material science and applied physics. (arxiv.org/abs/2307.16892) Here's the plain-english explanation: - The simulations modeled what the original Korean authors proposed was happening to their material - where copper atoms were percolating into a crystal structure and replacing lead atoms, causing the crystal to strain slightly and contract by 0.5%. This unique structure was proposed to allow this amazing property. - @sineatrix from Lawrence Berkeley National Lab simulated this using heavy-duty compute power from the Department of Energy, and looked to see what would happen to the 'electronic structure' of this material, meaning, what are the available conduction pathways in the material. - It turns out that there are conduction pathways for electrons that are in just the right conditions and places that would enable them to 'superconduct'. More specifically, they were close to the 'Fermi Surface' which is like the sea-level of electrical energy, as in '0 ft above sea-level.' It's believed currently that the more conduction pathways close to the Fermi surface, the higher the temperature you can superconduct at (An analogy might be how its easier for planes to fly close to the surface of the ocean due to the 'ground effect' that gives them more lift.) This plot in particular shows the 'bands', or electron pathways, crossing above and below the Fermi surface. - Lastly, these interesting conduction pathways only form when the copper atom percolates into the less likely location in the crystal lattice, or the 'higher energy' binding site. This means the material would be difficult to synthesize since only a small fraction of crystal gets its copper in just the right location. This is insanely bullish for humanity.

I'm launching #tactile64 today! This is a month-long game jam for 8x8 pad MIDI controllers (or multitouch screen phone/tablets). Everything runs in a browser and is powered by #quadplay open source. Learn more and join up at: itch.io/jam/tactile-64

I hit a bug in the Attention formula that’s been overlooked for 8+ years. All Transformer models (GPT, LLaMA, etc) are affected. Researchers isolated the bug last month – but they missed a simple solution… Why LLM designers should stop using Softmax 👇 evanmiller.org/attention-is-o…