My tweets reflect the opinions and values of American Idol season 3 winner Fantasia Barrino. 29. https://xitter.cf/t.co/juQ8fBFUi8

austin,tx
Joined September 2010
Supporting the writers strike because it was the studios that canceled HBO Ballers
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i get asked VERY frequently to chat about data / RL envs / new companies coming into the space. all of the questions tend to be exactly the same so i want to summarize my thoughts: Q: "Should I start a data company?" A: probably not, unless you have some sort of alpha or have seen what frontier RL envs are like. basically, if you're not deep within an industry, seen data via a lab or working at another data company, or very well connected with lab researchers, you probably should not. though, if its your passion, now is the best time and it'll get increasingly worse. data is also much harder now than it was 6 months ago, and quality standards are ever-increasing. Q: "Is there a product in the space?" A: i think there are repeatable systems that can be created. i.e. QA systems, faster task generation, infrastructure around rollouts/VMs/GPU utilization/prod. system emulation etc. i think data is inherently bespoke, luckily LLMs allow you to harness bespoke intellect infinitely. i don't think it's a SaaS style product where it serves everyone immediately, but more of a quant-desk type system with alpha on how to do specific tasks embedded within an engineer-system like manner. each eng will have a desk that serves them specifically that unlocks 10x, 100x, 1000x capabilities. Q: "Is {insert set} data valuable" A: depends on what you do with it. raw data dumps are cool but it's a lot more about what you can turn it into. Q: "How does {insert data company} differ from {insert competitor}?" OR "Should I join {insert data company}?" A: if you're in the "big, legacy" data companies with contractors, it doesn't really differ that much. if i had to pick, i'd probably join mercor or surge from the big contractor companies, by virtue of early employees/founders being extremely smart. however, i'd much rather join a small, research-heavy data company. they are by far the companies with the highest slope. Q: "Won't labs just in-house this anyway?" A: (1) data is an additive game that isn't zero-sum. just because labs are increasing synthetic data creation internally does not mean they won't buy more data. especially given it is an arms race to the top of intellect, if you can just make valuable data that moves the needle, it doesn't really matter if they can replicate it, it's not worth their researcher time if you solve a problem. the caveat being you have to actually add something yourself, and not just be a parrot who takes requests. saving researcher time is the name of the game. (2) i think this logic applies to everything, if you adopt this mentality, you probably should not work at any applied AI company, since they'll come after or absorb most products in the space.
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Segment Anything just evolved to 4D. Jingdong Zhang and team from NVIDIA and Texas A&M introduced S4VY, bringing feed forward architectures to 4D visual geometry. Existing models process video frame by frame, relying on sequential memory or tracking a seed mask step by step. S4VY takes an entirely different approach by extracting shared 4D geometric features across all observations simultaneously. Whether given continuous video, scattered frames, or unordered photo collections, it extracts full 4D object masks with persistent identity across space and time. S4VY segments every instance in a scene in a single feed forward pass, allows instant prompting across all viewpoints with a single click or box, and uses an agentic tree search pipeline to resolve natural language text prompts into grounded 4D objects.
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Quality of synthetic data is about to go uuuuuuuup
i think stacking jev on jev will work better than people realize because it solves the problem with old LLM output tainting new any memory system is at the mercy of past slop / wrong directions. jev doesn’t have the same burden due to its lack of sycophancy and auto regression
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Basically if you are dating somebody who you have legit career power over and don’t tell hr, you are a walking liability time bomb for the org . He did this!
A civil jury ruled in favor of ex-MIT scientist David Sabatini, who was accused by a younger colleague of inappropriate sexual conduct in his Cambridge research lab, and awarded him $6 million in damages. trib.al/s3v9VIX
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You should always go to hr for work relationships , the fact that neither of them did suggests they couldn’t make it work
A civil jury ruled in favor of ex-MIT scientist David Sabatini, who was accused by a younger colleague of inappropriate sexual conduct in his Cambridge research lab, and awarded him $6 million in damages. trib.al/s3v9VIX
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Loser behavior
Detroit News: Former Chair of the Michigan Democratic Party is leading an effort to make sure Democrats leave their ballot blank for the US Senate race in Michigan. Lon Johnson, the former chair, supported Rep. Haley Stephens over El-Sayed in the August Democratic primary. detroitnews.com/story/opinio…
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james retweeted
This is the best account on twitter currently. Just unbelievably good. Every single post is a god tier banger.
the 2000s thought airports would have fish tanks
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Jesus. This new SDNY indictment charges a 19-year-old man with plying two college girls with fentanyl, then raping one of them who wound up dying. Currently unclear on which Manhattan college campus this happened.
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james retweeted
you'll know more about GPU memory access and kernel optimization than 96.76% of people if you fully understand the CUDA C++ Best Practices Guide it covers profiling, memory coalescing, shared-memory bank conflicts, register use and occupancy, transfer overlap, and checking outputs against a reference. AI engineers can apply these when choosing tensor layouts and validating kernel changes. follow and save to keep up with the series. links in thread 🧵
we launched the most comprehensive ai performance engineering repo in the world follow and save to keep up with the series. links in thread 🧵 part 12: CUDA C++ Best Practices Guide NVIDIA's guide helps AI performance engineers connect a slow training step or inference request to a change they can test. it's a reference for deciding whether to change a tensor layout, reduce data movement, or tune a kernel's resource use. NVIDIA covers the measurement and optimization decisions behind CUDA applications: - profiling representative workloads and using Amdahl's law to estimate the benefit of accelerating a hotspot. for inference, use relevant batch sizes and sequence lengths to decide which kernels deserve engineering time. - timing GPU work with CUDA events and comparing requested memory traffic with actual transfers. for tensor copies and layout conversions, these measurements help check how much bandwidth the access pattern wastes. - keeping intermediate tensors on the GPU between model operations to avoid CPU round trips. pinned host memory and separate non-default streams can overlap incoming transfers with independent computation when the hardware supports it. - coalescing global-memory accesses by matching thread assignment to tensor layout. for strided tensors and transposes, inspect which addresses neighboring lanes touch before choosing a new layout or writing a custom kernel. - reusing matrix tiles in shared memory to reduce repeated global loads. the guide's transposed-tile example shows how padding removes its bank conflicts, giving engineers a concrete layout change to evaluate inside tensor kernels. - balancing block size, registers, and shared memory when tuning custom AI kernels. more registers can reduce spilling while lowering occupancy, so measure runtime across configurations to decide whether that tradeoff helps. - checking numerical results after changing reduction order or using faster math functions. for custom normalization or softmax kernels, compare outputs against a reference with explicit error tolerances alongside performance measurements. the worked matrix multiplications connect memory access patterns to measured performance. use them to plan a kernel optimization, then check whether the change improves the full training or inference workload while preserving numerical accuracy.
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genuinely a groundbreaking finding, but it also signals to me exactly how important pre-training & post-training data is. given that recursive generalization is essentially proven: > the learning models do is related, thus bad data will lead to bad learning and create polysemanticity where it potentially isn't needed. this can muddle the quality of the neuron and its firing. moreover, for frontier model labs, this can muddle the interpretability of that neuron, by giving it mixed signals. > classifying neurons are especially interesting here. nick breaks down the different organizational structures (i.e. a Colorado neuron or a health SEO neuron) of neurons. if i was a lab right now, i would be trying to understand emergent organizations in my models neurons to understand what fires during failures in training / evals. then, think about tangentially related data in the same activation that can boost the models performance without training only on in-distribution tasks. i.e. if the neuron generalizes, potentially data that sharpens that neuron could improve performance too. > once more interpretability research is done, if there are emergent patterns in every big model that are cross-shared, start thinking about datasets that can target specific neuron performances seems interesting. not sure if this is useful, but could be a new way of understanding model weaknesses, and seeing if there are pre-training / post-training gaps that can be found via exciting directions in evals.
interpretability might be the most important scientific problem in the world right now, as I don't think we can solve alignment if we don't know what we're building. I think I have good news about it. I co-authored early work in mechanistic interpretability at OpenAI and came away pessimistic, because neural networks appeared to fold into arbitrary tangled knots. years later, I started openai's first large-scale automated interpretability project, finding about 2% of neurons legible with the primitive tools we had with modern agentic tools and a much closer look, the picture looks totally different. the vast majority in models up to trillions of parameters are legible, and their circuits beautiful. many famous examples of tangled neurons turned out to be misunderstood. The roadblocks I expected mostly aren't there. I now think ambitious interpretability will be solved by the time we need it most, and possibly quite soon, as automated scientists keep improving. it may be a bitter lesson for interpretability: the simple thing, at absurd scale, works already-clean.goodfire.com/
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Cannot overstate how anathema it is to everything we are supposed to stand for that the president is trying to denaturalize his political enemy. It’s unamerican, it’s dictatorial, and it deserves to be rebuked as vehemently as possible.
BREAKING WSJ: The Trump admin's investigation into Rep. Ilhan Omar is aimed at building a case to strip her of her U.S. citizenship and ultimately deport her, according to U.S. officials and other people familiar with the probe. wsj.com/politics/policy/ilha…
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Stripping a political opponent of their citizenship and deporting them is, again, very bad stuff.
Trump administration is seeking to revoke Rep. Ilhan Omar’s (D-MN) U.S. citizenship and ultimately deport her. — WSJ
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james retweeted
OG required reading bc high quality ai data is hot rn (again) karpathy.github.io/2014/09/0…
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I stand with zohran
Breaking News: Mayor Zohran Mamdani’s administration is making a $30 million investment to build a quantum research lab at New York University. In exchange, the city will receive 15% of any proceeds from intellectual property developed in that lab. nyti.ms/4jUe7GD
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No?
The response to Shane Gillis's joke is why we lose elections, by the way.
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How to scale long-horizon agentic RL Envs? 🤔 We introduce Tev-Gym: 1,170 envs with dense progress rewards. Trained on it: 🔥 Tev-27B matches GPT-6 Astra & Claude Opus 5 on ALE-CM (computing and math domains) at Pass@5. 🚀 Tev-320B tops open models on Terminal-Bench 4.0-CM at Pass@1, only 0.02 behind GPT 5.6 sol. (1/n) #RSI #RL #RLEnv
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Our paper Test Set Contamination of Generative Evaluations was rejected from NeurIPS 2026, but I don't agree with reviewers and wanted to share it anyways! Motivation: How does test set contamination on *generative* evals match and differ from *discriminative* evals? 1/8
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"Our initial evaluation suggested that GPT-6-Astra's score was in the late eighties followed closely by Opus 5.5. But, as we started to investigate the mistakes that the models might have made, the models, especially Astra, insisted that they were right and that it was the expert-supplied answers that were erroneous. When we went back to the experts it turned out, in multiple instances, that that the experts found some subtle errors buried deep inside their calculations. As they revised their answers, Astra's score started to inch up and it finally ended up with 98% (49/50)."
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People keep saying trauma is a status symbol but idk most women I talk to have had like grey(gray?) area interactions where they are still uncomfortable but really don’t want to call somebody a criminal or sex pest .
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james retweeted
just want to say @SeanZCai if labs like my rl envs, all glory goes to you. this QA guide you put together is amazing and I'm very grateful. anyone interested in rl/benchmarking should take a look at it, and everything else Sean posts. seancai.com/philosophy/good_…
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