YY Ahn

YY Ahn

@yyahn.bsky.social

Prof @ School of Data Science, University of Virginia. Formerly at IU. Networks, data science, and machine learning. https://yyahn.com 🚲🚲🚲

6.1K followers1.3K following485 posts

YY Ahn reposted

This evening at 6pm, the Albemarle County Planning Commission will consider the Gander North development on 29 across from Wal-Mart, which will have 237 homes, including 48 that are income restricted. We wrote a letter in support of this development: docs.google.com/document/d/1...

docs.google.comSupport for Gander North DevelopmentDear Albemarle County Planning Commission, We ask that you vote to recommend approval of the Gander North Residential Development rezoning application. We also ask that you push for the high-density ...

YY Ahn reposted

Today starting at 6:30 PM — show up to support a great trail project that could some day connect Cville to Crozet and on to the Blue Ridge Tunnel👇🏽

Terri Miyamoto@terrimiyamoto.bsky.social

I'll be at the meeting re: Three Notched Trail Monday evening. Stop by Friends of Three Notched Trail table to say hi #cville. engage.albemarle.org/three-notche...

YY Ahn reposted

I get 5+ emails *a day* from prospective PhD students. I have seen some advice going around about what to write in these emails. Here's my piece of advice: don't waste your time. Or your tokens. #phdadmissions Or, if you really insist...

YY Ahn reposted

📣 Postdocs at Yale FDS! 📣 Tremendous freedom for work on the foundations of data science with faculty across campus, multi-year, great salary. Deadline 11/6. Spread the word! Application: academicjobsonline.org/ajo/jobs/32396 More about Yale FDS: fds.yale.edu

academicjobsonline.orgYale University, Institute for the Foundations of Data Science Job #AJO32396, Postdoc in Foundations of Data Science, Institute for the Foundations of Data Science, Yale University, New Haven, Connecticut, US

YY Ahn reposted

We are hiring!! "Artificial intelligence, broadly construed. This includes embodied AI and robotics, machine learning and the systems that support it, and AI developed for problems in science, engineering, medicine, education, and society." jobs.wisc.edu/jobs/assista...

jobs.wisc.eduAssistant / Associate / Full Professor of Computer Sciences - Madison, Wisconsin, United StatesCurrent Employees: If you are currently employed at any of the Universities of Wisconsin, log in to Workday to apply through the internal application process.Job Category:FacultyEmployment Type:Regula...

YY Ahn reposted

Goodhart’s law in action (as always!)

Nikhil Garg@nkgarg.bsky.social

Very glad to have @kevinren09.bsky.social 's first PhD paper out. AI text detection (aka Pangram) is very impressive. But when do we expect it to work? We warn that distribution shift is [still] a major issue -- (1) performance suffers in adversarial settings and with new LLMs

YY Ahn reposted

REMINDER: The priority deadline for this position is October 30th. We're looking for an Assistant Professor, tenure-track, in Library and Information at the UW Information School @ischool.uw.edu Please share with your networks. I am on the search committee and happy to answer questions.

Melanie Walsh@mellymeldubs.bsky.social

We are hiring for several positions in the UW Information School, including a tenure-track position in Library and Information Science. Please share with anyone interested in these areas! Deadline October 30. Job: apply.interfolio.com/192127

YY Ahn reposted

Reminder that we're holding this virtual NLP reading group every Monday @ 12PM ET. Sign up via the quoted form if you'd like to join us! Read, chat, and start your Monday by closing some of your open paper tabs.

Maria Antoniak@mariaa.bsky.social

Want to join an NLP reading group with me? 📚 I'm starting a virtual section of a reading group that I ran in Copenhagen. We'll spend 30 min reading quietly (your choice of readings) + 30 min sharing with each other. You get to read and learn a surprising amount! 🌐 Zoom 🗓️ Mondays @ 12PM ET

YY Ahn reposted

Reminder that @treygrainger and I are beginning our online conference "The Future of AI Search" Lots of great names giving talks like Yonik Seeley, Jo Kristan Bergum, and more Today we're hearing from Amelie Chatelain on whats going on with late interaction in 2026 maven.com/lls/3c81d4

maven.comThe Future of AI Search | MavenLive courses with real-world experts in AI, Product, Leadership, Design, Data & engineering, Marketing & sales, and Business & finance.

Go to your camera roll and search "boat" and then post a pic of a boat you like

Ted Underwood@tedunderwood.com

Go to your camera roll and search "boat" and then post a pic of a boat you like

YY Ahn reposted

Yale Statistics & Data Science is running an open-rank faculty search (Asst/Assoc/Full), focused on "Applied Data Science". I moved to Yale 2y ago and am very happy here! Feel free to reach out to me if you have questions. Review begins 11/1. statistics.yale.edu/assistantass...

statistics.yale.eduAssistant/Associate/Full Professor, Applied Data ScienceThe Department of Statistics and Data Science at Yale is seeking applicants for an assistant/associate/full professor, Applied Data Science.

I hope they also install traffic calming because speed limit is just a suggestion and does almost nothing without accompanying traffic calming yyahn.com/wiki/Traffic...

yyahn.comTraffic calming worksEvery residential street in your city comes in two versions. They cost about the same, and trips take about as long on either. But the slightly cheaper...
Lyle Solla-Yates 🦇 🦇 🦇@lyle.cville.online.ap.brid.gy

“the pilot’s goal is to measure the impact of lower speed limits on the safety of local roads.” #FairfaxVA #TwentyIsPlenty #SafeStreets #WarOnCars https://www.ffxnow.com/2026/10/16/fairfax-county-testing-20-mph-speed-limits-on-10-roads-this-fall/

ffxnow.comffxnow.comIngleside Avenue in McLean with a 25 mph speed limit sign (staff photo by Angela Woolsey) Fairfax County will soon start testing speed limits of 20 mph on select streets, more than two years after local governments in Virginia gained that authority. Starting this fall, speed limits will be lowered from 25 to 20 mph on 10 roads in the Dranesville, Mason and Providence districts, the Fairfax County Department of Transportation (FCDOT) announced yesterday. “Pilot roads were identified by FCDOT in coordination with the Board of Supervisors (BOS) district offices by considering several factors, including pedestrian activity, presence of sidewalks, marked crosswalks and transit stops [and] the presence of schools and other community uses,” FCDOT said. “… FCDOT also sought resident feedback when selecting roads for the study.” The roads included in the pilot study will be: > **Dranesville District:** > > * Douglass Drive from Georgetown Pike to Baron Road > * Baron Road from Randolph Road to Ingleside Avenue (small segment) > * Ingleside Ave from Baron Road to Dolley Madison Boulevard (Route 123) > > > **Mason District:** > > * Patrick Henry Drive from Leesburg Pike to Beachway Drive > * Peace Valley Lane on the west side of Justice High School > * Beachway Drive from Patrick Henry Drive to Nevius Street > * Nevius Street from Leesburg Pike to Beachway Drive > * Blair Road (segment), from Beachway Drive to Glen Carlyn Drive > > > **Providence District:** > > * Flagpole Lane from White Granite Drive to Borge Street > * Bushman Drive from Borge Street to Blake Lane > The finalized list mostly aligns with one that FCDOT presented last December for community feedback. However, two streets proposed in the Hunter Mill District — segments of Glade Drive and Pinecrest Road in Reston — didn’t move forward. According to FCDOT spokesperson Jennifer DeAngelis, Hunter Mill District Supervisor Walter Alcorn’s office opted not to have those Reston roads included in the pilot based on the public input provided late last year. “The survey results did not show sufficient community support for reducing the speed limit to 20 on those roads, so the Hunter Mill BOS office decided not to proceed,” DeAngelis told FFXnow. “However, Hunter Mill may select different pilot roads to take to the community when we do the next round of roads for the Pilot Study.” In addition, officials took into account the Fairfax County Vulnerability Index, which measures socioeconomic disparities based on income, education, housing, transportation and health care access, and other factors. FCDOT didn’t specify a start date for the pilot study, but the new speed limits will be in effect as soon as signs are installed, which could be as soon as next week, DeAngelis says. The Virginia General Assembly granted localities the authority to reduce speed limits on roads in business and residential districts with an existing cap of 25 mph in May 2024. In June, the Fairfax County Board of Supervisors gave county staff an official go-ahead to implement a pilot program that’s expected to eventually include streets from all nine magisterial districts. “After the first three pilot zones are installed, FCDOT staff will work with the remaining Board offices to implement pilot study zones in additional districts,” the department said, noting that the pilot’s goal is to measure the impact of lower speed limits on the safety of local roads.

The point is not that reducing speed limit is bad or futile. It’s great! But speed limit is just a beginning. It should be followed by proper traffic calming to *actually* make people driver slower.

A potential issue for this type of pilots (if no traffic calming) is that it may find “oh reducing speed limit does nothing” although that’s totally expected based on existing studies. Same for any premature measurement (protected bike lanes that are unconnected etc) Measuring impact is hard!

YY Ahn reposted

The 17.1% forecast is almost certainly wrong ***by a lot***, but it’s excellent for intellectual accountability when people put these kinds of predictions out

YY Ahn reposted

X's Community Notes are increasingly submitted by AI writers. In a new preprint, X open-sourced its Community Writer tool. A dive into the data underpinning it revealed that in Sept, six AI writers run by X's team wrote 90%+ of all AI-written notes, and 55% of notes that showed up on posts.

YY Ahn reposted

We're running out of time to stop burning fossil fuels "Earth’s climate system is moving deeper into uncharted territory. We present the 2026 update of planetary vital signs that track the state of Earth’s climate system, alongside indicators of the human activities driving ongoing change."

academic.oup.comThe 2026 state of the climate report: challenges and opportunitiesAbstract. Earth’s climate system is moving deeper into uncharted territory. We present the 2026 update of planetary vital signs that track the state of Ear

YY Ahn reposted

We're hiring across many roles at Trillium Labs to build the open scientific ecosystem for LLMs. Most important hires right now (ideally with start dates soon): * Full time post-training researchers * Engineers with experience with popular open-source libraries...

YY Ahn reposted

I've added #CSCW2026 to Lea! Schedule, program that you can filter by topic and people you follow, a custom feed, and more! Sadly I'm not attending, but if you are, try it out and let me know if you spot bugs or have feature requests! I can usually respond and implement things pretty quickly.

lea.acLea - CSCW 2026Oct 10 – Oct 15, 2026 · Salt Lake Marriott Downtown at City Creek, Salt Lake City, UT, USA · Schedule, papers, and attendees on Lea

YY Ahn reposted

🔎 Attending CSCW 2026? ⛰️ At #CSCW2026, I'll be presenting our research on Mastodon, a federated social media platform where moderation is largely volunteer-driven. 📌 Presentation Details 🗂️ Session: Decentralized Social Media 🗓️ Date: Wednesday, October 14 🕘 Time: 9:00–9:18 AM 📍 Location: Salon E

YY Ahn reposted

A harrowing story from @bench.bsky.social, Charlottesville’s Transportation Planning Manager, about being hit by a car on a city street while biking. We are grateful Ben wasn’t severely injured and hope he heels quickly. And we hope that city streets will quickly be made safe for everyone.

Ben Chambers@bench.bsky.social

So it happened. Today I got hit by a car while riding my bike. I’m ok. One gnarly cut on my nose and some road rash on my face arms and knees. I’ll probably be pretty sore and bruised tomorrow, but avoided any major injuries.

With heightened security risk due to AI, I'm wondering whether security and trust become a new moat/bottleneck. I'm fairly hesitant to replace my paid apps with open source ones due to the security concerns.

James O'Malley@jamesomalley.co.uk

Holy shit. Someone has decompiled the Adobe suite, rebuilt it in Rust and released it as open source. Either all software is dead or the US copyright laws are about to receive an update. getartcraft.com/apps

YY Ahn reposted

We're holding UVA's signature data science conference here at the School of Data Science next month, Friday November 13. This year's theme: The Future of Work, Powered by Data and People. Registration is free! Hope to see you here! blog.stephenturner.us/p/datapalooz...

blog.stephenturner.usDatapalooza 2026: The Future of Work, Powered by Data and PeopleUVA’s flagship data science conference will be held at the School of Data Science Friday November 13. This year’s theme: The Future of Work, Powered by Data and People. Registration is free.

A great place to study!

We're excited to announce 6 newly funded PhD positions at the intersection of AI, Machine Learning and Data Science through the National Science Foundation (NSF) EPSCoR Graduate Research Fellows Program. vermontcomplexsystems.org/engage/jobs/

YY Ahn reposted

One of the key lessons from Dutch cycling history is cities didn't start with protected lanes. They began by making streets safer, calmer and more inviting; with lower speeds, parking restrictions, traffic filters and reduced through-traffic to create an environment in which cycling could flourish.🧵

YY Ahn reposted

BTW this means no funding for GSS, ANES, or PSID. GSS 2026 is in the field now, but then it looks like that's it. Devastating for social science.

Dan Garisto@dangaristo.bsky.social

NEW: In March the White House released an FY27 budget request that zeroed out the National Science Foundation's directorate of Social, Behavioral and Economic Sciences (SBE). For months it was unclear what would happen. Now, with FY26 over, the damage to SBE is coming to light. My reporting:

YY Ahn reposted

We're starting our crosstown bike bus pilot (pilot!) officially tomorrow. Look for me out there in a bright yellow shirt, riding back and forth in the W Main corridor.

This is great! Check out this post yyahn.com/wiki/Leaf-bl... that I shared with the city right after they switched Downtown Mall leaf blowers to electric!

yyahn.comLeaf blower pollutionImagine 300 Ford F-150 Raptors circling around your house. Now imagine one gardener using a gas leaf blower. Guess which releases more of the hydrocarbon...
Livable Cville@livablecville.bsky.social

The City Of Charlottesville has announced a program to provide rebates for the purchase of electric landscaping equipment. This is very exciting! #ElectrifyEverything More information here: www.charlottesville.gov/2044/Electri...

YY Ahn reposted

I don’t think everyone realizes how bad things are for US science: For the fiscal year that just ended, the Trump regime withheld $1.4 billion from the National Science Foundation’s research budget, which is about 1/5 of its primary research budget.

nytimes.comNational Science Foundation Diverted $1.4 Billion in Science Funds Mandated by Congress (Gift Article)The move, affecting about one-fifth of the National Science Foundation’s primary research budget, is the latest sign of how the White House is asserting more control over grants.

YY Ahn reposted

Sort of insane fact about how broken US urban planning is—America now spends more building *just the lights for roads and highways* than on all subways & ground mass transit combined Spending on roadway *pavement* is 18x transit spending

Car prices are insane here. Ban selling 'luxury' cars over $50k, require lengthy reviews and public comments before bringing any new cars into town, force dealers to sell cheap cars at a loss, and ensure no profits for those greedy dealers. That'll make cars more affordable in our city!

Allowing many new cars into the city will send the signal to UVA that it is ok to admit many more students, which will ruin our way of living and neighborhood characters!