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Automatic differentiation can be incorrect

news.ycombinator.com Christopher Rackauckas 2025-09-21 22:01:35

ISCL Seminar Series The Numerical Analysis of Differentiable Simulation: How Automatic Differentiation of Physics Can Give Incorrect Derivatives Scientific machine learning (SciML) relies heavily on automatic differentiation (AD), the process of constructing gradients which include machine learning integrated into mechanistic models for the purpose of gradient-based optimization. While these differentiable programming approaches pitch an idea of “simply put the simulator into a loss function a

Topics: ad differentiable greater numerical sciml

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Automatic Differentiation Can Be Incorrect

news.ycombinator.com Christopher Rackauckas 2025-09-22 08:01:35

ISCL Seminar Series The Numerical Analysis of Differentiable Simulation: How Automatic Differentiation of Physics Can Give Incorrect Derivatives Scientific machine learning (SciML) relies heavily on automatic differentiation (AD), the process of constructing gradients which include machine learning integrated into mechanistic models for the purpose of gradient-based optimization. While these differentiable programming approaches pitch an idea of “simply put the simulator into a loss function a

Topics: ad differentiable greater numerical sciml

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Scientists Detect Strange Signal in Gravitational Waves

futurism.com Unknown 2025-09-23 23:06:23

For the first time, astrophysicists have measured the recoil — or "kick," in the parlance — resulting from the birth of a new black hole that formed from the merger of two preexisting ones. The international team of researchers measured the ripples in the fabric of spacetime, known as gravitational waves, allowing them to get unprecedented insights into the turbulent dynamics of two black holes crashing into each other. The team analyzed data collected by the Advanced LIGO and Virgo gravitatio

Topics: away black different gravitational hole

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I just want an 80×25 console, but that's no longer possible

news.ycombinator.com John Goerzen 2025-09-25 07:26:02

Somehow along the way, a feature that I’ve had across DOS, OS/2, FreeBSD, and Linux — and has been present on PCs for more than 40 years — is gone. That feature, of course, is the 80×25 text console. Linux has, for awhile now, rendered its text console using graphic modes. You can read all about it here. This has been necessary because only PCs really had the 80×25 text mode (Raspberry Pis, for instance, never did), and even they don’t have it when booted with UEFI. I’ve lately been annoyed t

Topics: 25 400 80 console different

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Pulling an Inverse Conway Maneuver at Netflix (2023)

news.ycombinator.com Juan Ignacio Vimberg 2025-09-29 22:26:32

Pulling an Inverse Conway Maneuver at Netflix When I first joined the Netflix Platform team circa 2020, the Observability offering was composed of a series of tools serving different purposes. There was Atlas for metrics, Edgar for distributed tracing, Radar for Logs and Alerts, Lumen for dashboards, Telltale for app health, etc. It was a portfolio of about 20 different apps. Big and small, ranging from business-specific tools to analyze playback sessions to low-level tools for CPU profiling.

Topics: different org structure teams tools

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Is Hollow Knight: Silksong too hard? Well, it depends on what you mean by “hard.”

arstechnica.com Unknown 2025-10-03 04:45:40

For seven years, the discussion around Hollow Knight: Silksong focused on the cult-like levels of devotion among fans patiently waiting for the sequel. Now that Silksong has been available for about a week, though, that discussion has turned decisively toward seemingly endless takes on the game's relative difficulty (or lack thereof). The discussion has gotten so loud that the developers at Team Cherry have vowed to implement a "slight difficulty reduction in early game bosses Moorwing and Siste

Topics: difficulty game good players silksong

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Clojure's Solutions to the Expression Problem

news.ycombinator.com Chris Houser 2025-10-01 18:31:50

At times, to evolve your product, you need to rebuild it from scratch. The article provides the story behind the rewrite of InfluxDB from scratch using a different programming language - Rust - and stack - Apache Flight, Data Fusion, Apache Arrow and Parquet (FDAP). It emphasises the benefits, as well as the mechanics behind its operation and the different versions of the product.

Topics: apache benefits different product scratch

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How eSIMs Work, and How to Switch to One From a Standard SIM

wired.com David Nield 2025-10-06 17:00:00

The physical SIM cards we've used for decades are slowly being phased out. With the Pixel 10 series, Google's phones have gone eSIM-only for the first time—at least if you buy them in the US. Apple made the same move with the iPhone 14 in 2022, and now its new iPhone 17 models will operate with eSIMs in a dozen countries, with the slim iPhone Air going eSIM-only everywhere in the world. But how is eSIM different, and what do you need to do to switch? The good news is that by most measures, eSI

Topics: different esim google phone sim

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Why you’ll want to have two tabs open to watch the iPhone 17 event

9to5mac.com Ben Lovejoy 2025-10-11 08:51:18

There’s just one day to go until the iPhone 17 event, and the Awe Dropping announcements will of course be streaming online. You have a choice of three different ways to watch the event live, and if you’re watching from a browser, it’s worth having two different tabs open … While we’re expecting the presentations to be pre-recorded, as we’ve seen for the last few years, it is still streamed as if it were a live event. We previously outlined the three different ways to watch the livestream: A

Topics: apple different event live open

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Nvidia Is Not Happy With the Gain AI Act, Says As Much

gizmodo.com Riley Gutiérrez Mcdermid 2025-10-10 23:09:41

In a move drawing considerable attention across the tech industry, Nvidia Corporation has publicly critiqued the recently proposed Gain AI Act, emphasizing its potential to stifle competition in the rapidly evolving artificial intelligence sector. The GAIN AI Act, which stands for Guaranteeing Access and Innovation for National Artificial Intelligence Act, was introduced as part of the U.S. National Defense Authorization Act, with the goal of ensuring that the United States is the dominant mark

Topics: ai chips diffusion industry nvidia

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ChatGPT’s new branching feature is a good reminder that AI chatbots aren’t people

arstechnica.com Unknown 2025-10-12 08:06:55

On Thursday, OpenAI announced that ChatGPT users can now branch conversations into multiple parallel threads, serving as a useful reminder that AI chatbots aren't people with fixed viewpoints but rather malleable tools you can rewind and redirect. The company released the feature for all logged-in web users following years of user requests for the capability. The feature works by letting users hover over any message in a ChatGPT conversation, click "More actions," and select "Branch in new chat

Topics: chatgpt conversation different feature users

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The Diffusion Dilemma

news.ycombinator.com Unknown 2025-10-09 17:03:03

On the sun-baked plains of the American Midwest in 1892, a revolution was loudly sputtering to life: the tractor, an engine which signaled the end of the era of animal power and the beginning of the age of machine power. This machine was not just a piece of equipment; the tractor was a manifestation of an exponential shift in energy density, from animal metabolism to coal burning, empowered by discoveries in thermodynamics. But diffusion of the tractor, screeching across the horizon, took much l

Topics: diffusion innovation new technologies technology

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The Last Vestal Virgin and the Fall of Rome

news.ycombinator.com Debra May Macleod 2025-10-19 07:50:09

Ask twenty different people what led to the fall of Rome, and you’ll get twenty different answers. Experts will give you an array of opinions, depending on their area of specialization or what thesis paper they’re writing. There is no single right answer. Political squabbling, weakened borders, a diluted army, disease, economic crises... some even say it was because of lead in the pipes. The fall of the Roman Empire—why it happened, and when exactly—it’s a huge subject. Yet there were people li

Topics: ancient coelia different fall rome

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As GM prepares to switch its EVs to NACS, it has some new adapters

arstechnica.com Unknown 2025-10-26 02:10:27

In mid-2023, just as it seemed like the North American auto industry had settled on CCS1 as the default fast-charging plug, everything upended as Ford, then General Motors, then everyone else announced they were adopting the North American Charging Standard. Originally developed by Tesla, NACS has a different plug but uses the same electronic communication protocols as CCS, and adoption of NACS thus makes all those non-Tesla electric vehicles compatible with the extensive Tesla Supercharger net

Topics: charging different nacs tesla year

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Elden Ring Nightreign is getting even harder in September

theverge.com Andrew Webster 2025-10-26 04:05:08

is an entertainment editor covering streaming, virtual worlds, and every single Pokémon video game. Andrew joined The Verge in 2012, writing over 4,000 stories. Posts from this author will be added to your daily email digest and your homepage feed. If FromSoftware’s multiplayer take on Elden Ring was just a little too easy for you, the developer has just the thing coming up. The studio announced “Deep of Night,” a new mode for Nightreign that is focused specifically on difficulty. Namely, it s

Topics: difficulty just like mode night

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Matter Is Finally Ready to Deliver the Smart Home It Promised

wired.com Paul Lamkin 2025-10-31 12:00:00

Last month's Ikea's announcement of more than 20 new Matter-over-Thread devices felt like a much-needed breakthrough moment for the high-profile smart home standard. If Ikea—a brand with a broad, not necessarily tech-savvy customer base—is all-in on Matter, have we finally arrived at the smart home utopia that was first promised back in late 2019? It was then, amid growing frustrations from users around smart home compatibility, that tech giants including Apple, Amazon, Google, and Samsung form

Topics: different home matter smart thread

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How the cavefish lost its eyes—again and again

arstechnica.com Unknown 2025-11-02 03:51:50

Time and again, whenever a population was swept into a cave and survived long enough for natural selection to have its way, the eyes disappeared. “But it’s not that everything has been lost in cavefish,” says geneticist Jaya Krishnan of the Oklahoma Medical Research Foundation. “Many enhancements have also happened.” Though the demise of their eyes continues to fascinate biologists, in recent years, attention has shifted to other intriguing aspects of cavefish biology. It has become increasingl

Topics: cave different eyes lost says

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The Hidden Ingredients Behind AI’s Creativity

wired.com Webb Wright 2025-11-02 12:00:00

The original version of this story appeared in Quanta Magazine. We were once promised self-driving cars and robot maids. Instead, we’ve seen the rise of artificial intelligence systems that can beat us in chess, analyze huge reams of text, and compose sonnets. This has been one of the great surprises of the modern era: physical tasks that are easy for humans turn out to be very difficult for robots, while algorithms are increasingly able to mimic our intellect. Another surprise that has long p

Topics: creativity diffusion images models new

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Stepanov's biggest blunder? The curious case of adjacent difference

news.ycombinator.com Roman Kashitsyn 2025-10-31 02:30:59

The curious case of adjacent difference If you have ever tried using the std::adjacent_difference algorithm in c++, I’m sure it left you puzzled. As the name suggests, this algorithm computes differences between adjacent elements of the input sequence, but it does one more thing: it copies the first element of the input sequence into the output sequence unmodified. The following example demonstrates how to apply the algorithm to delta-compress a postings list of document identifiers that contain

Topics: adjacent_difference partial sequence std sums

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LabPlot: Free, open source and cross-platform Data Visualization and Analysis

news.ycombinator.com Alexander Semke 2025-11-04 12:11:26

This post is written on behalf of the LabPlot team. It’s different compared to what we usually publish on our homepage but we feel we need to share this story with our community. Introduction You might already know this, but finalizing a release for a…

Topics: behalf community compared different feel

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Deeply divided Supreme Court lets NIH grant terminations continue

arstechnica.com Unknown 2025-11-05 12:52:45

Shortly after the Trump Administration took office, it started cancelling grants for things it had disagreements with: funding for pandemic preparation, efforts to diversify the scientific workforce, those that targeted minority health issues, and more. These terminations were challenged in court, and a consolidate case was heard in the District of Massachusetts, pitting the government against individual researchers, organizations that represent them, and states that host research institutions.

Topics: court different funding government stay

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The Pixel 10 Pro’s 100x zoom is Google’s most controversial use of AI yet — here’s why

androidauthority.com Unknown 2025-11-08 04:00:17

Google loves AI, and it’s doubled down on the tech with every new Pixel generation. But this year’s Pixel 10 Pro and Pro XL take things to another level, introducing a diffusion model to upscale images from the phone’s conservative 5x optical zoom into telescopic-length 100x photos. Google is no stranger to computational photography or AI-assisted imaging — features like Add Me and Astrophotography mode laid the groundwork for its ongoing evolution. However, the introduction of diffusion models

Topics: ai diffusion google image images

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Show HN: I replaced vector databases with Git for AI memory (PoC)

news.ycombinator.com Unknown 2025-11-08 04:20:11

DiffMem: Git-Based Differential Memory for AI Agents DiffMem is a lightweight, git-based memory backend designed for AI agents and conversational systems. It uses Markdown files for human-readable storage, Git for tracking temporal evolution through differentials, and an in-memory BM25 index for fast, explainable retrieval. This project is a proof-of-concept (PoC) exploring how version control systems can serve as a foundation for efficient, scalable memory in AI applications. At its core, Dif

Topics: agents ai diffmem git memory

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Poll: Was Made by Google 2025 a win or a cringe-fest?

androidauthority.com Unknown 2025-11-09 08:43:47

Google Google’s big hardware showcase looked a little different this year. Rather than the standard keynote format to introduce the Pixel 10 series and other hardware, the company leaned into a talk show vibe for Made by Google 2025, with Jimmy Fallon hosting and guest spots from Stephen Curry, Lando Norris, and the Jonas Brothers. Don’t want to miss the best from Android Authority? Set us as a preferred source in Google Search to support us and make sure you never miss our latest exclusive re

Topics: 2025 corporate did different google

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Ted Raimi Says a ‘Xena’ Reboot Would Have to Take Inspiration From ‘Cobra Kai’

gizmodo.com Sabina Graves 2025-11-12 03:17:09

Growing up in the ’90s, serialized heroines were big on the small screen with Xena: Warrior Princess and Buffy the Vampire Slayer—heck, even Sabrina the Teenage Witch. After Netflix’s dark Sabrina reboot and the new Buffy in the works with Sarah Michelle Gellar returning to mentor a new chosen one, all we need now is to see Xena ride again. And that might be on the verge of happening. The cast and creative team behind Xena recently participated in an oral history of the show for Entertainment W

Topics: different like new star xena

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The First Trailer for ‘Keeper’ Deepens Its Creepy Mystery

gizmodo.com Cheryl Eddy 2025-11-14 22:45:55

Some filmmakers take a long time between projects. Others are more rapid-fire. In the time since Oz Perkins popped up in Jordan Peele’s last film, 2022’s Nope, playing a small role as a movie director, he released Longlegs (the highest-grossing indie film of 2024) as well as this year’s The Monkey—and in a few months, Keeper will hit theaters too. Peele has the sports horror film Him, which he produced, coming out soon, but his next directorial effort won’t arrive until October 2026. Different

Topics: different exactly film keeper perkins

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WIRED Takes You Back to School

wired.com Luke Larsen 2025-11-16 12:00:00

Young people entering classrooms this fall need a totally different tool set than the generations before them.

Topics: classrooms different entering fall generations

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How One Wikipedia Editor Unraveled the ‘Single Largest Self-Promotion Operation’ in the Site's History

wired.com Nate Anderson 2025-11-15 20:00:00

Quick—what are the top entries in the category "Wikipedia articles written in the greatest number of languages"? The answer is countries. Turkey tops the list with Wikipedia entries in 332 different languages, while the US is second with 327 and Japan is third with 324. Other common words make their appearance as one looks down the list. "Dog" (275 languages) tops "cat" (273). Jesus (274) beats "Adolf Hitler" (242). And all of them beat "sex" (122), which is also bested by "fever," "Chiang Kai

Topics: different languages like mcveigh woodard

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The Big ‘Superman’ Speech Happened After This Emotional Behind the Scenes Moment

gizmodo.com Germain Lussier 2025-11-17 06:45:00

Sometimes the most magical thing about a movie is seeing how it came together. We can watch the final product and feel however it makes us feel, but that’s usually disconnected from all the work that went into it. You rarely think about the different takes, different conversations, and intense work that go into every single second. Especially a film’s biggest, most important emotional moment. James Gunn’s Superman is now available to watch at home, and part of the release is a 60-minute special

Topics: different director gunn making superman

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Porsche’s best daily driver 911? The 2025 Carrera GTS T-Hybrid review.

arstechnica.com Unknown 2025-11-18 17:00:44

Porsche 911 enthusiasts tend to be obsessive about their engines. Some won't touch anything that isn't air-cooled, convinced that everything went wrong when emissions and efficiency finally forced radiators into the car. Others love the "Mezger" engines; designed by engineer Hans Mezger, they trace their roots to the 1998 Le Mans-winning car, and no Porschephile can resist the added shine of a motorsports halo. I'm quite sure none of them will feel the same way about the powertrain in the new 9

Topics: car different engine gitlin hybrid

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Latest Tech News

Automatic differentiation can be incorrect

Automatic Differentiation Can Be Incorrect

Scientists Detect Strange Signal in Gravitational Waves

I just want an 80×25 console, but that's no longer possible

Pulling an Inverse Conway Maneuver at Netflix (2023)

Is Hollow Knight: Silksong too hard? Well, it depends on what you mean by “hard.”

Clojure's Solutions to the Expression Problem

How eSIMs Work, and How to Switch to One From a Standard SIM

Why you’ll want to have two tabs open to watch the iPhone 17 event

Nvidia Is Not Happy With the Gain AI Act, Says As Much

ChatGPT’s new branching feature is a good reminder that AI chatbots aren’t people

The Diffusion Dilemma

The Last Vestal Virgin and the Fall of Rome

As GM prepares to switch its EVs to NACS, it has some new adapters

Elden Ring Nightreign is getting even harder in September

Matter Is Finally Ready to Deliver the Smart Home It Promised

How the cavefish lost its eyes—again and again

The Hidden Ingredients Behind AI’s Creativity

Stepanov's biggest blunder? The curious case of adjacent difference

LabPlot: Free, open source and cross-platform Data Visualization and Analysis

Deeply divided Supreme Court lets NIH grant terminations continue

The Pixel 10 Pro’s 100x zoom is Google’s most controversial use of AI yet — here’s why

Show HN: I replaced vector databases with Git for AI memory (PoC)

Poll: Was Made by Google 2025 a win or a cringe-fest?

Ted Raimi Says a ‘Xena’ Reboot Would Have to Take Inspiration From ‘Cobra Kai’

The First Trailer for ‘Keeper’ Deepens Its Creepy Mystery

WIRED Takes You Back to School

How One Wikipedia Editor Unraveled the ‘Single Largest Self-Promotion Operation’ in the Site's History

The Big ‘Superman’ Speech Happened After This Emotional Behind the Scenes Moment

Porsche’s best daily driver 911? The 2025 Carrera GTS T-Hybrid review.

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